COMSAT CORP
S-4, 1994-05-03
COMMUNICATIONS SERVICES, NEC
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<PAGE>
      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MAY 3, 1994

                                                       REGISTRATION NO. 33-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                           --------------------------
                                    FORM S-4
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
                               COMSAT CORPORATION
             (Exact name of Registrant as specified in its charter)

<TABLE>
<S>                          <C>                         <C>
   DISTRICT OF COLUMBIA                 4813                  52-0781863
      (State or other            (Primary Standard         (I.R.S. Employer
      jurisdiction of                Industrial             Identification
     incorporation or           Classification Code             Number)
       organization)                  Number)
                          --------------------------
</TABLE>

<TABLE>
<S>                                                      <C>
                6560 Rock Spring Drive                                   Jerome W. Breslow, Esq.
               Bethesda, Maryland 20817                               Vice President and Secretary
                    (301) 214-3000                                         COMSAT Corporation
  (Address, including zip code, and telephone number,                    6560 Rock Spring Drive
    including area code, of Registrant's principal                      Bethesda, Maryland 20817
                  executive offices)                                         (301) 214-3000
                                                                 (Name, address, including zip code, and
                                                           telephone number including area code, of agent for
                                                                                service)
</TABLE>

                           --------------------------

                                   COPIES TO:

<TABLE>
<S>                                   <C>                                   <C>
      William P. O'Neill, Esq.            John L. Sullivan, III, Esq.               Lynn A. Soukup, Esq.
          Crowell & Moring             Shaw, Pittman, Potts & Trowbridge     Shaw, Pittman, Potts & Trowbridge
   1001 Pennsylvania Avenue, N.W.            1501 Farm Credit Drive                 2300 N Street, N.W.
       Washington, D.C. 20004                McLean, Virginia 22102                Washington, D.C. 20037
           (202) 624-2500                        (703) 790-7900                        (202) 663-8000
</TABLE>

    APPROXIMATE  DATE OF COMMENCEMENT OF PROPOSED  SALE OF THE SECURITIES TO THE
PUBLIC: As soon  as practicable after  the effective date  of this  Registration
Statement,  on  the effective  date of  the merger  (the "Merger")  of Radiation
Systems, Inc. ("RSi")  into a  subsidiary of COMSAT  Corporation ("COMSAT"),  as
described in the Agreement and Plan of Merger, dated as of January 30, 1994 (the
"Merger  Agreement"), attached  as Exhibit  A to  the Proxy Statement/Prospectus
forming a part of this Registration Statement.

    If the  securities  being registered  on  this  Form are  being  offered  in
connection  with the formation of a holding company and there is compliance with
General Instruction G., check the following box. / /
                           --------------------------

                        CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
                                                                     PROPOSED               PROPOSED
                                                                      MAXIMUM                MAXIMUM
      TITLE OF EACH CLASS OF                AMOUNT TO             OFFERING PRICE            AGGREGATE              AMOUNT OF
    SECURITIES TO BE REGISTERED           BE REGISTERED              PER SHARE           OFFERING PRICE        REGISTRATION FEE
<S>                                  <C>                       <C>                    <C>                    <C>
Common Stock, without par value....    6,409,210 shares (1)            N.A.            $139,599,511.40(2)        $48,123.97(3)
<FN>
(1)  The number  of shares  of COMSAT  Common Stock  being registered  has  been
     determined  based on the product of (a)(i) 8,621,437, the maximum number of
     shares of RSi Common Stock that  would be outstanding immediately prior  to
     the  Merger, assuming  the exercise of  all exercisable  RSi stock options,
     minus (ii)  404,500, the  number of  shares  of RSi  Common Stock  held  by
     COMSAT,  which  will  be cancelled  in  the  Merger, and  (b)  a Conversion
     Fraction (as defined  in the  Merger Agreement)  of .780  shares of  COMSAT
     Common  Stock for  each share  of RSi  Common Stock,  which is  the highest
     Conversion Fraction possible under the Merger Agreement.
(2)  Estimated solely  for  the  purpose of  calculating  the  registration  fee
     required  by Section 6(b)  of the Securities  Act of 1933,  as amended (the
     "Securities Act"), and computed pursuant  to Rule 457(f)(1) by  multiplying
     $16.1875,  the average of the high and  low sale prices of RSi Common Stock
     on the NASDAQ  National Market  System on May  2, 1994,  by 8,621,437,  the
     maximum  number  of shares  of RSi  Common Stock  computed as  described in
     clause (a)(i) of Note (1).
(3)  Pursuant to Rule 457(b) under the  Securities Act and Section 14(g) of  the
     Securities  Exchange Act of 1934, as amended, and Rule 0-11 thereunder, the
     total registration  fee  of $48,123.97  is  offset  by the  filing  fee  of
     $30,498.33  paid on March  11, 1994, in  connection with the  filing of the
     preliminary proxy materials by RSi on that date.
</TABLE>

    THE REGISTRANT HEREBY  AMENDS THIS  REGISTRATION STATEMENT ON  SUCH DATE  OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE  A  FURTHER  AMENDMENT  WHICH SPECIFICALLY  STATES  THAT  THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE  IN ACCORDANCE WITH SECTION 8(A)  OF
THE  SECURITIES ACT  OF 1933  OR UNTIL  THE REGISTRATION  STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION  8(A),
MAY DETERMINE.

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                 CROSS-REFERENCE SHEET PURSUANT TO ITEM 501(B)
    OF REGULATION S-K SHOWING THE LOCATION IN THE PROXY STATEMENT/PROSPECTUS
               OF THE INFORMATION REQUIRED BY PART I OF FORM S-4

<TABLE>
<CAPTION>
ITEM OF FORM S-4                                                    LOCATION OR CAPTION IN PROXY STATEMENT/PROSPECTUS
- ----------------------------------------------------------------  -----------------------------------------------------
<C>        <S>                                                    <C>
A. INFORMATION ABOUT THE TRANSACTION
       1.  Forepart of Registration Statement and Outside Front
           Cover Page of Prospectus.............................  Facing Page of the Registration Statement;
                                                                  Cross-Reference Sheet; Outside Front Cover of Proxy
                                                                  Statement/Prospectus
       2.  Inside Front and Outside Back Cover Pages of
           Prospectus...........................................  Available Information; Incorporation of Certain
                                                                  Documents By Reference; Table of Contents
       3.  Risk Factors, Ratio of Earnings to Fixed Charges and
           Other Information....................................  Summary; Selected Historical and Pro Forma Financial
                                                                  Data; Comparative Per Share Data; Comparative Per
                                                                  Share Market Data
       4.  Terms of the Transaction.............................  Summary; The Merger; Description of COMSAT Capital
                                                                  Stock; Comparison of Rights of Shareholders of RSi
                                                                  and COMSAT
       5.  Pro Forma Financial Information......................  COMSAT Corporation and Radiation Systems, Inc.
                                                                  Unaudited Pro Forma Combined Condensed Financial
                                                                  Statements
       6.  Material Contacts with the Company Being Acquired....  The Merger -- Background of the Merger; The Merger --
                                                                  Interests of Certain Persons in the Merger;
                                                                  Employment Agreements
       7.  Additional Information Required for Reoffering by
           Persons and Parties Deemed to Be Underwriters........  Not Applicable
       8.  Interests of Named Experts and Counsel...............  The Merger -- Opinion of RSi's Financial Advisor
       9.  Disclosure of Commission Position on Indemnification
           for Securities Act Liabilities.......................  Not Applicable
B. INFORMATION ABOUT THE REGISTRANT
      10.  Information with Respect to S-3 Registrants..........  Available Information; Incorporation of Certain
                                                                  Documents by Reference
      11.  Incorporation of Certain Information by Reference....  Available Information; Incorporation of Certain
                                                                  Documents by Reference
      12.  Information with Respect to S-2 or S-3 Registrants...  Not Applicable
      13.  Incorporation of Certain Information by Reference....  Not Applicable
      14.  Information with Respect to Registrants Other Than
           S-3 or S-2 Registrants...............................  Not Applicable
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
ITEM OF FORM S-4                                                    LOCATION OR CAPTION IN PROXY STATEMENT/PROSPECTUS
- ----------------------------------------------------------------  -----------------------------------------------------
<C>        <S>                                                    <C>
C. INFORMATION ABOUT THE COMPANY BEING ACQUIRED
      15.  Information with Respect to S-3 Companies............  Available Information; Incorporation of Certain
                                                                  Documents by Reference; Radiation Systems, Inc.
                                                                  Consolidated Financial Statements
      16.  Information with Respect to S-2 or S-3 Companies.....  Not Applicable
      17.  Information with Respect to Companies Other Than S-3
           or S-2 Companies.....................................  Not Applicable
D. VOTING AND MANAGEMENT INFORMATION
      18.  Information if Proxies, Consents or Authorizations
           are to be Solicited..................................  Outside Front Cover of Proxy Statement/ Prospectus;
                                                                  Available Information; Incorporation of Certain
                                                                  Documents by Reference; The Special Meeting;
                                                                  Ownership of RSi Common Stock; The Merger --
                                                                  Interests of Certain Persons in the Merger;
                                                                  Employment Agreements; -- Appraisal Rights;
                                                                  Information Concerning COMSAT; Information Concerning
                                                                  RSi; Solicitation of Proxies
      19.  Information if Proxies, Consents or Authorizations
           are not to be Solicited or in an Exchange Offer......  Not Applicable
</TABLE>
<PAGE>
                                     [LOGO]
                            RADIATION SYSTEMS, INC.
                                1501 MORAN ROAD
                            STERLING, VIRGINIA 20166

May 4, 1994

Dear Stockholder:

You  are  cordially invited  to attend  the Special  Meeting of  Stockholders of
Radiation Systems, Inc. ("RSi") to be held at 10:00 a.m. on Friday, June 3, 1994
at Holiday Inn Washington -- Dulles, 1000 Sully Road, Sterling, Virginia  22170.
At  the Special  Meeting you will  be asked  to consider and  approve the merger
agreement between RSi and COMSAT Corporation ("COMSAT") providing for the merger
of RSi into a subsidiary of COMSAT (the "Merger").

Under the terms of the merger agreement,  which was signed on January 30,  1994,
RSi  common stock  outstanding immediately  prior to  the effective  date of the
Merger will be  converted into that  fraction (the "Conversion  Fraction") of  a
share  of  COMSAT common  stock  determined by  dividing  $18.25 by  the average
closing price of COMSAT  common stock on the  New York Stock Exchange  Composite
Tape  during the 20 trading  days ending five trading  days prior to the closing
date of the  Merger. This Conversion  Fraction, however, will  not be less  than
.638 and will not be greater than .780. See "THE MERGER -- The Merger Agreement"
in  the attached Proxy Statement/Prospectus. If  the stockholders of RSi approve
the transaction, RSi and COMSAT intend to complete the Merger on the day of  the
Special Meeting. Cash will be paid in lieu of fractional shares.

RSi  and COMSAT have  discussed extensively the  strategic benefits of combining
the two companies. Your Board of Directors has received an opinion of investment
bankers that the consideration to be paid  to RSi stockholders in the Merger  is
fair,  from a financial point of  view. After consideration of these discussions
and  opinion,  and   the  other   factors  described  in   the  attached   Proxy
Statement/Prospectus,  the RSi Board  believes that the terms  of the Merger are
fair to,  and  that  the Merger  is  in  the  best interests  of,  RSi  and  its
stockholders.  See "THE MERGER -- Background  of the Merger," "-- Recommendation
of the RSi Board of Directors; RSi's Reasons for the Merger," and "-- Opinion of
RSi's  Financial  Advisor"  in  the  attached  Proxy  Statement/Prospectus.  RSi
stockholders  are not entitled to dissenters'  appraisal rights under the Nevada
General Corporation Law. See  "THE MERGER -- Appraisal  Rights" in the  attached
Proxy Statement/Prospectus.

COMSAT is an international communications, information and
entertainment-distribution  services company. It provides  voice, video and data
services to customers  worldwide by  fixed and  mobile technologies  and is  the
largest  owner  and  user of  the  global INTELSAT  and  Inmarsat communications
satellite  networks.  COMSAT  also  furnishes  satellite  systems   integration,
wireless  networks and technical consulting,  offers on-demand entertainment and
information services  to  the  hospitality  industry and  owns  the  NBA  Denver
Nuggets.  Copies of the  COMSAT 1993 Annual Report  to Shareholders and COMSAT's
1993 Form  10-K, as  amended to  supplement information  in the  Annual  Report,
accompany the attached Proxy Statement/Prospectus.

Following  the  Merger, the  operations of  RSi will  be combined  with COMSAT's
existing systems integration  division, COMSAT Technology  Services ("CTS"),  to
form COMSAT RSI, which will pursue opportunities in satellite and other wireless
communications,  radar,  scientific  and  related  special  application markets.
Offering integrated systems and products,  COMSAT RSI will target  international
and domestic markets that include cellular, PCS, gateway earth stations and VSAT
technology.  We believe that combining the core competencies of RSi and CTS will
provide  comprehensive  solutions  to  customers  with  sophisticated   wireless
communications  needs  and  create  a  business  that  will  be  better  able to
capitalize on the changing needs of our customers around the world.

The  attached  Proxy  Statement/Prospectus  describes  in  greater  detail   the
transaction  to be considered and voted  upon. Please give this information your
careful consideration and promptly complete, sign, date, and return the enclosed
proxy.

Sincerely,
Richard E. Thomas
Chairman, President and
 Chief Executive Officer
<PAGE>
                                     [LOGO]
                            RADIATION SYSTEMS, INC.
                                1501 MORAN ROAD
                            STERLING, VIRGINIA 20166

                            ------------------------

                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
                            TO BE HELD JUNE 3, 1994

                            ------------------------

TO THE STOCKHOLDERS OF RADIATION SYSTEMS, INC.:

    NOTICE IS HEREBY  GIVEN that a  Special Meeting (the  "Special Meeting")  of
Stockholders  of Radiation Systems, Inc., a  Nevada corporation ("RSi"), will be
held at Holiday Inn  Washington -- Dulles, 1000  Sully Road, Sterling,  Virginia
22170,  on Friday  June 3, 1994,  at 10:00  a.m., local time,  for the following
purposes:

        1.   To consider  and  vote upon  a proposal  to  approve and  adopt  an
    Agreement  and Plan  of Merger,  dated as of  January 30,  1994 (the "Merger
    Agreement"),  among  RSi,  COMSAT   Corporation,  a  District  of   Columbia
    corporation  ("COMSAT"), and CTS America,  Inc., a Delaware corporation that
    is a wholly owned subsidiary of  COMSAT ("CTS America"), pursuant to  which:
    (a)  RSi will merge into CTS America,  and CTS America will be the surviving
    corporation (the "Merger"), and  (b) each share of  common stock, par  value
    $1.00  per share,  of RSi  (the "RSi  Common Stock")  issued and outstanding
    immediately prior to  the effective date  of the Merger,  other than  shares
    held  by RSi, COMSAT or a subsidiary of RSi or of COMSAT, shall be converted
    into  that  fraction  (the  "Conversion  Fraction")  of  a  fully  paid  and
    non-assessable  share  of the  common stock,  without  par value,  of COMSAT
    ("COMSAT Common Stock") determined by dividing $18.25 by the average closing
    price of the COMSAT  Common Stock on the  New York Stock Exchange  Composite
    Tape  during  the 20  trading days  ending  five trading  days prior  to the
    closing date of the Merger; PROVIDED, that the Conversion Fraction shall not
    be less than .638 and shall not be greater than .780, and that cash shall be
    paid in lieu of fractional shares.

        2.  To  transact such  other business as  may properly  come before  the
    Special Meeting or any adjournments thereof.

    The stock transfer books of RSi will not be closed, but only stockholders of
record  at the close of business on April  4, 1994 will be entitled to notice of
and to vote at such meeting or any adjournments thereof.

                                          By order of the Board of Directors
                                          Anita M. Stutzman
                                          SECRETARY

May 4, 1994

    The affirmative vote by the holders of a majority of the outstanding  shares
of  RSi Common Stock is  necessary for the approval  of the Merger Agreement and
the transactions  contemplated thereby.  It  is important  that your  shares  be
represented  at the Special Meeting. We hope you will attend, but whether or not
you intend to be present in person,  please complete, sign, date and return  the
enclosed proxy promptly. A stamped reply envelope is enclosed for that purpose.

    PLEASE  DO NOT  SEND IN  YOUR RSI  STOCK CERTIFICATES  AT THIS  TIME. IF THE
MERGER IS  CONSUMMATED,  YOU  WILL  RECEIVE  TRANSMITTAL  INSTRUCTIONS  FOR  THE
SURRENDER  AND EXCHANGE OF  YOUR RSI STOCK CERTIFICATES  FROM THE EXCHANGE AGENT
AFTER   THE   SPECIAL   MEETING,   AS   DESCRIBED   IN   THE   ATTACHED    PROXY
STATEMENT/PROSPECTUS  UNDER  THE  HEADING  "THE  MERGER  --  EXCHANGE  OF  STOCK
CERTIFICATES."
<PAGE>

           PROXY STATEMENT                              PROSPECTUS
               [LOGO]                                     [LOGO]
           1501 MORAN ROAD                        6560 ROCK SPRING DRIVE
      STERLING, VIRGINIA 20166                   BETHESDA, MARYLAND 20817

    This  Proxy Statement  of Radiation Systems,  Inc. and  Prospectus of COMSAT
Corporation (the "Proxy  Statement/Prospectus") relates to  the proposed  merger
(the  "Merger") of Radiation  Systems, Inc., a  Nevada corporation ("RSi"), with
and into CTS  America, Inc., a  Delaware corporation ("CTS  America") that is  a
wholly   owned  subsidiary  of  COMSAT   Corporation,  a  District  of  Columbia
corporation ("COMSAT"), pursuant to an Agreement and Plan of Merger, dated as of
January 30, 1994 (the "Merger Agreement"), among RSi, COMSAT and CTS America. As
a result of the Merger, RSi will merge into CTS America, the separate  existence
of  RSi will cease,  and CTS America  will be the  surviving corporation. At the
effective date of the Merger,  each share of common  stock, par value $1.00  per
share,  of RSi ("RSi Common Stock")  issued and outstanding immediately prior to
the effective date of  the Merger, other  than shares held by  RSi, COMSAT or  a
subsidiary  of RSi  or of  COMSAT, shall  be converted  into that  fraction (the
"Conversion Fraction") of a fully paid and non-assessable share of common stock,
without par  value, of  COMSAT ("COMSAT  Common Stock")  determined by  dividing
$18.25 by the average closing price (the "Average Price") of COMSAT Common Stock
on  the New York Stock Exchange Composite Tape during the 20 trading days ending
five trading days prior to  the closing date of  the Merger; PROVIDED, that  the
Conversion  Fraction shall not be  less than .638 and  shall not be greater than
.780, and that cash shall be paid in  lieu of fractional shares. On May 2,  1994
(the  most  recent  practicable  date prior  to  mailing  this  Proxy Statement/
Prospectus), the closing  sale price of  RSi Common  Stock was $16  1/8 and  the
closing sale price of COMSAT Common Stock was $21 3/8. If the Average Price were
equal  to the  closing sale  price of COMSAT  Common Stock  on May  2, 1994, the
Conversion Fraction would be the maximum of .780 and the value RSi  stockholders
would receive in COMSAT Common Stock for each share of RSi Common Stock would be
$16.67. See "COMPARATIVE MARKET PRICE DATA."

    RSi  is soliciting proxies from stockholders  for use at the Special Meeting
of Stockholders scheduled to be held on June 3, 1994 (the "Special Meeting"), to
consider and vote upon the approval and adoption of the Merger Agreement and the
transactions contemplated thereby.

    This Proxy Statement/Prospectus constitutes both the proxy statement of  RSi
relating to the solicitation of proxies by its Board of Directors for use at the
Special Meeting, and the prospectus of COMSAT with respect to the issuance of up
to  6,409,210 shares of COMSAT Common Stock  to be issued pursuant to the Merger
Agreement. This  Proxy Statement/Prospectus  and the  enclosed proxy  are  first
being sent to stockholders of RSi on or about May 4, 1994.

                            ------------------------

THE  SECURITIES  TO  WHICH  THIS  PROXY  STATEMENT/PROSPECTUS  RELATES  HAVE NOT
   BEEN APPROVED OR  DISAPPROVED BY  THE SECURITIES  AND EXCHANGE  COMMISSION
     OR  ANY  STATE  SECURITIES  COMMISSION  NOR  HAS  THE  SECURITIES  AND
       EXCHANGE   COMMISSION   OR   ANY   STATE   SECURITIES   COMMISSION
           PASSED  UPON  THE  ACCURACY  OR  ADEQUACY  OF  THIS  PROXY
              STATEMENT/PROSPECTUS.  ANY  REPRESENTATION  TO   THE
                            CONTRARY IS A CRIMINAL OFFENSE.

                            ------------------------

          The date of this Proxy Statement/Prospectus is May 3, 1994.
<PAGE>
    NO   PERSON  IS  AUTHORIZED   TO  GIVE  ANY  INFORMATION   OR  TO  MAKE  ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED OR INCORPORATED BY REFERENCE IN  THIS
PROXY   STATEMENT/PROSPECTUS  AND,  IF  GIVEN   OR  MADE,  SUCH  INFORMATION  OR
REPRESENTATIONS SHOULD NOT BE RELIED UPON. THIS PROXY STATEMENT/PROSPECTUS  DOES
NOT  CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF AN OFFER TO PURCHASE, THE
SECURITIES OFFERED BY THIS PROXY STATEMENT/PROSPECTUS, OR THE SOLICITATION OF  A
PROXY,  IN ANY JURISDICTION  TO OR FROM  ANY PERSON TO  WHOM OR FROM  WHOM IT IS
UNLAWFUL TO MAKE SUCH OFFER, SOLICITATION  OF AN OFFER OR PROXY SOLICITATION  IN
SUCH  JURISDICTION. NEITHER THE DELIVERY  OF THIS PROXY STATEMENT/PROSPECTUS NOR
ANY DISTRIBUTION  OF  SECURITIES  PURSUANT TO  THIS  PROXY  STATEMENT/PROSPECTUS
SHALL,  UNDER ANY CIRCUMSTANCES,  CREATE ANY IMPLICATION THAT  THERE HAS BEEN NO
CHANGE IN THE INFORMATION  SET FORTH OR INCORPORATED  HEREIN BY REFERENCE OR  IN
THE  AFFAIRS OF COMSAT OR RSI SINCE THE DATE OF THIS PROXY STATEMENT/PROSPECTUS.
ALL INFORMATION REGARDING  COMSAT IN  THIS PROXY  STATEMENT/PROSPECTUS HAS  BEEN
SUPPLIED BY COMSAT, AND ALL INFORMATION REGARDING RSI HAS BEEN SUPPLIED BY RSI.

                             AVAILABLE INFORMATION

    COMSAT  and  RSi  are  subject  to  the  informational  requirements  of the
Securities Exchange  Act of  1934,  as amended  (the  "Exchange Act"),  and,  in
accordance  therewith, are required to file  reports, proxy statements and other
information with the Securities and  Exchange Commission (the "SEC"). Copies  of
such reports, proxy statements and other information can be inspected and copied
at the public reference facilities maintained by the SEC at Room 1024, Judiciary
Plaza,  450  Fifth Street,  N.W., Washington,  D.C. 20549  and at  the following
Regional Offices  of the  SEC: Suite  1400, 500  West Madison  Street,  Chicago,
Illinois  60661; and 7 World  Trade Center, New York,  New York 10048. Copies of
such material can  be obtained  at prescribed  rates from  the Public  Reference
Section  of  the SEC,  450 Fifth  Street, N.W.,  Washington, D.C.  20549. COMSAT
Common Stock is listed and traded on  the New York Stock Exchange (the  "NYSE"),
the  Chicago  Stock Exchange  (the "CSE")  and the  Pacific Stock  Exchange (the
"PSE"). Reports, proxy statements and other information concerning COMSAT may be
inspected at the offices of the NYSE, 20 Broad Street, New York, New York 10005,
the CSE, 440  South LaSalle Street,  Chicago, Illinois 60605,  and the PSE,  301
Pine Street, San Francisco, California 94104.

    COMSAT has filed with the SEC a registration statement on Form S-4 (together
with  any amendments thereto, the "Registration Statement") under the Securities
Act of 1933, as amended  (the "Securities Act"), with  respect to the shares  of
COMSAT  Common Stock to be  issued pursuant to the  Merger Agreement. This Proxy
Statement/Prospectus does  not contain  all  the information  set forth  in  the
Registration  Statement, certain portions of which have been omitted pursuant to
the rules  and  regulations of  the  SEC.  Such additional  information  may  be
obtained from the SEC's principal office in Washington, D.C.

                                       ii
<PAGE>
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

    This  Proxy Statement/Prospectus incorporates certain documents by reference
which are  not  presented herein  or  delivered herewith.  These  documents  are
available upon request from, in the case of COMSAT, Shareholder Services, COMSAT
Corporation,  6560 Rock Spring Drive, Bethesda, Maryland 20817, telephone number
(301) 214-3200, and in the case of RSi, Corporate Secretary, Radiation  Systems,
Inc.,  1501  Moran  Road,  Sterling,  Virginia  20166,  telephone  number  (703)
450-5680. In order  to ensure timely  delivery of these  documents, any  request
should be made by May 26, 1994.

    COMSAT  and RSi hereby  undertake to provide without  charge to each person,
including any beneficial owner of RSi Common Stock, to whom a copy of this Proxy
Statement/Prospectus has been delivered, upon the written or oral request of any
such person, a copy of any and all of the documents referred to below which have
been or may  be incorporated herein  by reference, other  than exhibits to  such
documents,   unless  such  exhibits  are  specifically  incorporated  herein  by
reference. Requests  for  such  documents  should  be  directed  to  the  person
indicated  in the immediately preceding paragraph with respect to the applicable
corporation.

    The following documents, which have been filed with the SEC pursuant to  the
Exchange Act, are hereby incorporated herein by reference.

        (a)  COMSAT's Annual Report on Form 10-K for the year ended December 31,
    1993 (including Amendment  No. 1  thereto filed with  the SEC  on April  29,
    1994);

        (b)  COMSAT's Current Reports on Form 8-K filed with the SEC on February
    1, 1994, March 7, 1994, March 11, 1994 and April 26, 1994;

        (c) RSi's Annual Report on Form 10-K for the fiscal year ended June  30,
    1993 (including Amendments No. 1, No. 2 and No. 3 thereto filed with the SEC
    on March 11, 1994, March 14, 1994, and April 18, 1994, respectively);

        (d)  RSi's Quarterly Reports  on Form 10-Q for  the fiscal quarter ended
    September 30, 1993 (including Amendment No. 1 thereto filed with the SEC  on
    March 11, 1994) and the fiscal quarter ended December 31, 1993; and

        (e)  RSi's Current Reports  on Form 8-K  filed with the  SEC on March 7,
    1994 (including Amendment  No. 1  thereto filed with  the SEC  on March  11,
    1994) and April 28, 1994.

    All documents filed by COMSAT or RSi pursuant to Section 13(a), 13(c), 14 or
15(d)  of the Exchange  Act after the date  hereof and prior to  the date of the
Special Meeting shall be deemed to be incorporated herein by reference and to be
a part  hereof  from the  date  of filing  of  such documents.  All  information
appearing  in this  Proxy Statement/Prospectus  or in  any document incorporated
herein by reference is not necessarily complete and is qualified in its entirety
by the information and financial statements (including notes thereto)  appearing
in  the documents incorporated  herein by reference and  should be read together
with such information and documents.

    Any statements  contained  in  a  document  incorporated  or  deemed  to  be
incorporated  herein by reference  shall be deemed to  be modified or superseded
for purposes of this Proxy Statement/Prospectus  to the extent that a  statement
contained  herein or in any other subsequently  filed document that is deemed to
be incorporated herein by reference  modifies or supersedes such statement.  Any
such  statement so  modified or  superseded shall  not be  deemed, except  as so
modified or superseded, to constitute a part of this Proxy Statement/Prospectus.

                                      iii
<PAGE>
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
AVAILABLE INFORMATION....................................................     ii
INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE..........................    iii
SUMMARY..................................................................      v
SELECTED HISTORICAL AND UNAUDITED PRO FORMA FINANCIAL DATA...............     ix
COMPARATIVE PER SHARE DATA...............................................    xii
COMPARATIVE PER SHARE MARKET DATA........................................   xiii
THE SPECIAL MEETING......................................................      1
  Purpose of the Meeting.................................................      1
  Date, Time and Place; Record Date......................................      1
  Voting Rights..........................................................      2
OWNERSHIP OF RSi COMMON STOCK............................................      3
THE MERGER...............................................................      5
  General Description of the Merger......................................      5
  Background of the Merger...............................................      5
  Recommendation of the RSi Board of Directors; RSi's Reasons for the
   Merger................................................................     10
  COMSAT's Reasons for the Merger........................................     11
  Opinion of RSi's Financial Advisor.....................................     12
  Shareholder Litigation.................................................     16
  Interests of Certain Persons in the Merger; Employment Agreements......     17
  The Merger Agreement...................................................     20
    Representations and Warranties.......................................     20
    Certain Covenants....................................................     20
    No Solicitation of Other Transactions................................     21
    Conditions to the Merger.............................................     21
    Stock Options; Employee Benefits.....................................     22
    Termination..........................................................     22
    Expenses and Termination Fee.........................................     22
    Amendment and Waiver.................................................     23
  Closing; Effective Date................................................     23
  Exchange of Stock Certificates.........................................     23
  No Fractional Shares...................................................     24
  The Stock Option Agreement.............................................     24
  Delisting and Deregistration of RSi Common Stock After the Merger......     25
  Resales of COMSAT Common Stock Issued in the Merger; Affiliates........     25
  NYSE Listing of COMSAT Common Stock....................................     26
  Regulatory Matters.....................................................     26
  Certain Federal Income Tax Consequences of the Merger..................     26
  Accounting Treatment...................................................     28
  Appraisal Rights.......................................................     28
  Operations After the Merger............................................     28
INFORMATION CONCERNING COMSAT............................................     28
INFORMATION CONCERNING RSi...............................................     29
COMSAT CORPORATION AND RADIATION SYSTEMS, INC. UNAUDITED PRO FORMA
 COMBINED CONDENSED FINANCIAL STATEMENTS.................................     33
COMPARATIVE MARKET PRICE DATA............................................     40
DESCRIPTION OF COMSAT CAPITAL STOCK......................................     41
COMPARISON OF RIGHTS OF SHAREHOLDERS OF RSi AND COMSAT...................     46
LEGAL MATTERS............................................................     55
EXPERTS..................................................................     55
SOLICITATION OF PROXIES..................................................     55
RSi TRANSFER AGENT.......................................................     56
RADIATION SYSTEMS, INC. CONSOLIDATED FINANCIAL STATEMENTS................    F-1
Exhibit A -- Agreement and Plan of Merger................................    A-1
Exhibit B -- Stock Option Agreement......................................    B-1
Exhibit C -- Opinion of Alex. Brown & Sons Incorporated..................    C-1
</TABLE>

                                       iv
<PAGE>
                                    SUMMARY

    THE  FOLLOWING IS  A SUMMARY OF  CERTAIN INFORMATION  CONTAINED ELSEWHERE IN
THIS PROXY  STATEMENT/PROSPECTUS. REFERENCE  IS  MADE TO,  AND THIS  SUMMARY  IS
QUALIFIED  IN ITS ENTIRETY  BY, THE DETAILED  INFORMATION APPEARING ELSEWHERE IN
THIS PROXY STATEMENT/PROSPECTUS OR INCORPORATED HEREIN BY REFERENCE. CAPITALIZED
TERMS USED AND  NOT OTHERWISE DEFINED  IN THIS SUMMARY  HAVE THE MEANINGS  GIVEN
THEM  ELSEWHERE  HEREIN. STOCKHOLDERS  ARE URGED  TO  READ CAREFULLY  THIS PROXY
STATEMENT/PROSPECTUS IN ITS ENTIRETY.

THE MERGER

    This  Proxy  Statement/Prospectus  relates  to  the  proposed  merger   (the
"Merger")  of Radiation Systems, Inc. ("RSi") into CTS America, Inc., which is a
wholly owned  subsidiary  of  COMSAT  Corporation  ("COMSAT"),  pursuant  to  an
Agreement  and  Plan  of  Merger  dated as  of  January  30,  1994  (the "Merger
Agreement"). On the Effective Date (as defined under "-- Effective Date") of the
Merger, each share  of common stock,  par value  $1.00 per share,  of RSi  ("RSi
Common  Stock") issued and outstanding immediately  prior to the Effective Date,
other than shares held by RSi, COMSAT or a subsidiary of RSi or of COMSAT,  will
be converted into that fraction (the "Conversion Fraction") of a share of common
stock,  without  par  value, of  COMSAT  ("COMSAT Common  Stock")  determined by
dividing $18.25 by the average closing price  of COMSAT Common Stock on the  New
York  Stock  Exchange (the  "NYSE") Composite  Tape during  the 20  trading days
ending five trading days prior  to the date of  the closing of the  transactions
contemplated  by  the  Merger  Agreement  (the  "Closing");  PROVIDED,  that the
Conversion Fraction shall not be  less than .638 and  shall not be greater  than
.780.  See "THE  MERGER -- General  Description of the  Merger" and "COMPARATIVE
MARKET PRICE DATA."  No certificates  representing fractional  shares of  COMSAT
Common  Stock will  be issued in  the Merger.  See "THE MERGER  -- No Fractional
Shares." The full text of the Merger Agreement is attached as Exhibit A to  this
Proxy Statement/Prospectus and should be read carefully in its entirety.

THE COMPANIES

    COMSAT.    COMSAT,  which  was incorporated  in  1963,  is  an international
communications, information and entertainment distribution services company.  It
provides voice, video and data services and is the largest owner and user of the
global  INTELSAT  and Inmarsat  communications  satellite networks.  COMSAT also
provides  satellite  systems  integration,   wireless  networks  and   technical
consulting,  offers  on-demand  entertainment and  information  services  to the
hospitality industry, and owns  the NBA Denver  Nuggets. COMSAT was  established
pursuant  to the Communications Satellite Act  of 1962 (the "Satellite Act") and
certain of its activities are subject to oversight and regulation by the Federal
Communications Commission (the "FCC"). COMSAT has approximately 1,640 employees.
COMSAT's principal  executive offices  are located  at 6560  Rock Spring  Drive,
Bethesda, Maryland 20817, telephone number (301) 214-3000.

    RSI.    RSi,  which  was incorporated  in  1960,  designs,  manufactures and
integrates  systems,   subsystems   and  components   for   advanced   microwave
communications,  radar and related applications,  from the largest international
gateway earth stations for satellite transmission  of voice, data and video,  to
electronically  scanning phased array antennas for  the North Warning System, to
the high power switch for the Patriot missile. RSi has a solid base of expertise
in meeting the  demanding requirements of  the U.S. Government  for special  use
antennas  and  related  subsystems  in  air  traffic  control,  intelligence and
scientific  applications,  as  well  as   for  military  uses  such  as   radar,
line-of-sight radio-relay and troposcatter communications. RSi is also a leading
commercial  supplier  of  microwave  antennas  for  worldwide  cellular markets,
satellite downlink terminals for distance learning and business networks, sector
antennas for Europe's  digital personal and  mobile communications markets,  and
base  station  antennas for  U.S.  and European  trials  of wireless  local area
networks  (LANs).  RSi  has  approximately  1,000  employees.  RSi's   principal
executive  offices are  located at  1501 Moran  Road, Sterling,  Virginia 20166,
telephone number (703) 450-5680.

THE SPECIAL MEETING

    At the  special  meeting of  stockholders  of  RSi and  any  adjournment  or
postponement  thereof (the "Special  Meeting"), the stockholders  of RSi will be
asked to consider and  vote upon the  proposal to approve  and adopt the  Merger
Agreement  and  the transactions  contemplated thereby.  The Special  Meeting is

                                       v
<PAGE>
scheduled to be  held at 10:00  a.m., local time,  on Friday, June  3, 1994,  at
Holiday Inn Washington -- Dulles, 1000 Sully Road, Sterling, Virginia 22170. The
RSi  Board of  Directors (the "RSi  Board") has  fixed the close  of business on
April 4, 1994 as the  record date (the "Record  Date") for the determination  of
holders  of RSi Common  Stock entitled to notice  of and to  vote at the Special
Meeting. See "THE SPECIAL MEETING."

RECOMMENDATION OF THE RSI BOARD OF DIRECTORS

    The RSi Board believes that the terms of the Merger are fair to, and in  the
best  interests  of,  RSi  and  its  stockholders.  ACCORDINGLY,  THE  RSI BOARD
UNANIMOUSLY HAS APPROVED THE MERGER AGREEMENT AND THE TRANSACTIONS  CONTEMPLATED
THEREBY,  AND UNANIMOUSLY RECOMMENDS  THAT RSI STOCKHOLDERS  VOTE "FOR" APPROVAL
AND ADOPTION OF THE MERGER AGREEMENT AND THE TRANSACTIONS CONTEMPLATED  THEREBY.
In  making this  recommendation, the RSi  Board considered a  number of factors,
which are described in detail under the heading "THE MERGER -- Recommendation of
the RSi Board of Directors; RSi's Reasons for the Merger."

OPINION OF RSI'S FINANCIAL ADVISOR

    Alex. Brown &  Sons Incorporated ("Alex.  Brown"), RSi's financial  advisor,
delivered  to the RSi Board its written  opinion, dated January 30, 1994, to the
effect that, as of such date, and  based upon and subject to certain matters  as
stated  therein, the consideration to  be received by the  holders of RSi Common
Stock in the Merger is fair to such holders from a financial point of view.  The
full  text of the opinion of Alex. Brown, which sets forth the assumptions made,
general procedures followed and matters considered, is attached as Exhibit C  to
this  Proxy Statement/Prospectus and  should be read  carefully in its entirety.
See "THE MERGER  -- Background  of the Merger,"  "-- Recommendation  of the  RSi
Board  of Directors;  RSi's Reasons  for the  Merger" and  "-- Opinion  of RSi's
Financial Advisor." On May 1, 1994, at  a meeting of the RSi Board, Alex.  Brown
confirmed  to the RSi Board  that, based upon the  information reviewed by Alex.
Brown as described under "THE MERGER  -- Background of the Merger," Alex.  Brown
knew of no reason to change its opinion that the consideration to be received by
RSi  stockholders in the  Merger was fair,  from a financial  point of view. See
"THE MERGER -- Background of the Merger."

INTERESTS OF CERTAIN PERSONS IN THE MERGER

    In considering the  recommendations of  the RSi  Board with  respect to  the
Merger  Agreement and the transactions contemplated thereby, stockholders should
be aware that certain members of RSi  management and the RSi Board have  certain
interests in the Merger that are in addition to the interests of stockholders of
RSi  generally. See "THE MERGER  -- Interests of Certain  Persons in the Merger;
Employment Agreements" and "-- The  Merger Agreement -- STOCK OPTIONS;  EMPLOYEE
BENEFITS."

REQUIRED VOTE; SHARE OWNERSHIP OF MANAGEMENT, THE RSI EMPLOYEE STOCK OWNERSHIP
PLAN AND COMSAT

    The  affirmative vote of the holders of a majority of the outstanding shares
of RSi Common Stock is  required to approve and  adopt the Merger Agreement  and
the  transactions contemplated  thereby. If a  RSi stockholder  returns a signed
proxy card, but does  not indicate how his  or her shares are  to be voted,  the
shares  represented by the proxy card will  be voted "FOR" approval and adoption
of the Merger Agreement and the transactions contemplated thereby.

    As of the  Record Date, directors  and executive officers  of RSi and  their
affiliates  owned  3.32%  of the  shares  of  RSi Common  Stock  outstanding and
entitled to vote  at the Special  Meeting, including 32,808  shares held in  the
executive  officers'  accounts in  the RSi  Employee  Stock Ownership  Plan (the
"ESOP"). As of  the Record  Date, the  ESOP owned 10.63%  of the  shares of  RSi
Common  Stock outstanding and entitled to vote  at the Special Meeting, of which
407,799 shares (4.92% of the shares of RSi Common Stock outstanding and entitled
to vote  at  the  Special  Meeting) have  been  allocated  to  participants  and
beneficiaries  and  473,273 shares  (5.71%  of the  shares  of RSi  Common Stock
outstanding and entitled to  vote at the Special  Meeting) are unallocated.  The
ESOP  provides that each participant or beneficiary shall direct the trustees of
the ESOP as  to the  manner in  which shares  allocated to  such participant  or
beneficiary  are to be voted. The ESOP  does not contain a provision instructing
the trustees of  the ESOP as  to the voting  of allocated shares  for which  the
trustees  have  not  received  directions  from  the  applicable  participant or
beneficiary. The trustees will vote such shares in a manner consistent with  the
voting of the allocated shares

                                       vi
<PAGE>
for  which directions have been received  unless, in the trustees' opinion, such
action would  be  inconsistent  with  their fiduciary  duties  to  the  ESOP  or
otherwise  inconsistent with applicable regulations.  The ESOP provides that the
trustees of the ESOP  shall vote all unallocated  shares in a manner  consistent
with  the voting of the allocated shares  unless, in the trustees' opinion, such
action would  be  inconsistent  with  their fiduciary  duties  to  the  ESOP  or
otherwise inconsistent with applicable regulations. The trustees of the ESOP are
Mark  D. Funston and Anita M. Stutzman, officers of RSi, and George Reed, all of
whom are employees of RSi.

    To be effective, directions to the trustees of the ESOP must be received  by
Wachovia  Bank of  North Carolina, N.A.  at Wachovia Corporate  Trust, 301 North
Church, Second  Floor, Winston-Salem,  North  Carolina 27102,  Attention:  Stock
Transfer,  by  the  close of  business  (5:00 p.m.  E.D.T)  on June  2,  1994. A
participant or  beneficiary in  the ESOP  who is  otherwise an  RSi  stockholder
should  (i) complete and return directions to  the ESOP trustees with respect to
RSi Common Stock  held by  the ESOP  that is  allocated to  such participant  or
beneficiary and (ii) complete and return the enclosed proxy with respect to such
other RSi Common Stock.

    As  of the Record Date, COMSAT  owned 404,500 shares (approximately 4.9%) of
RSi Common Stock outstanding and entitled to vote at the Special Meeting.

    No vote of the shareholders  of COMSAT is required  to approve or adopt  the
Merger  Agreement or the  transactions contemplated thereby  or to authorize the
issuance of COMSAT Common Stock in the Merger.

CONDITIONS TO THE MERGER

    In addition to  the approval and  adoption of the  Merger Agreement and  the
transactions  contemplated  thereby  by  the  RSi  stockholders  at  the Special
Meeting, the obligations of the parties to consummate the Merger are subject  to
the  satisfaction  or  waiver  of certain  conditions  specified  in  the Merger
Agreement, including, among  others, the  expiration of  the applicable  waiting
period  under  the  Hart-Scott-Rodino  Antitrust Improvements  Act  of  1976, as
amended (the  "HSR  Act");  the  truth and  correctness  of  the  other  party's
representations  and warranties;  there being in  effect no  order enjoining the
Merger; and receipt by COMSAT  and RSi of an opinion  of Deloitte & Touche  that
the  Merger will be accounted for as a pooling of interests. COMSAT and RSi made
the required filings under  the HSR Act  on February 14,  1994, and the  waiting
period  expired on March  16, 1994. The  obligation of COMSAT  to consummate the
Merger  is  subject  to  the  satisfaction  or  waiver  of  certain   additional
conditions,  including,  among  others,  that  no  audit,  investigation  or due
diligence review by COMSAT with respect to RSi's representations and  warranties
shall  have revealed  liabilities of RSi  not previously  disclosed which exceed
$7.56 million; that  RSi's aggregate  contract backlog  in specified  categories
shall  be at least $118.5 million on the date of the Closing; that from June 30,
1993 to the Closing there shall not  have occurred certain events or changes  in
specified  matters  relating  to  RSi's business  or  financial  condition which
exceed, with respect to certain of such events or changes, $4.28 million in  the
aggregate;  and that there shall not be any action or proceeding challenging the
Merger or otherwise seeking to prohibit its consummation. The obligation of  RSi
to  consummate  the Merger  also is  subject  to the  satisfaction or  waiver of
certain additional conditions, including that the shares of COMSAT Common  Stock
to  be issued to RSi  stockholders in the Merger be  approved for listing on the
NYSE. In addition, the Merger Agreement may be terminated in certain events. See
"THE MERGER  --  The Merger  Agreement  -- CONDITIONS  TO  THE MERGER"  and  "--
TERMINATION."

EFFECTIVE DATE

    The  Merger Agreement provides  that after all the  conditions in the Merger
Agreement have been  satisfied or waived,  the Merger will  become effective  at
5:00  p.m., local  time in Nevada,  on the  later to occur  of the  day when the
Certificate of Merger  required under Delaware  law is filed  with the  Delaware
Secretary  of State or the day when the Articles of Merger required under Nevada
law are filed with  the Nevada Secretary of  State (the "Effective Date").  Such
filings  will be  made simultaneously  with or  as soon  as practical  after the
Closing, which RSi and COMSAT  anticipate will occur on  the day of the  Special
Meeting. See "THE MERGER -- Closing; Effective Date."

                                      vii
<PAGE>
TERMINATION FEE AND EXPENSE REIMBURSEMENT

    The  Merger Agreement provides that if RSi at any time prior to December 31,
1994 is acquired by, merges or effectuates a business combination with, or sells
substantially all  of its  assets to  any  person or  entity not  controlled  by
COMSAT, or agrees to do any of the foregoing, RSi will be required to pay COMSAT
$5  million, plus an expense reimbursement of  up to $2.5 million. If the Merger
Agreement is terminated by the breach of one of the parties, the breaching party
will be required to pay to the non-breaching party, as its exclusive remedy, the
actual costs  and  expenses of  the  non-breaching  party, not  to  exceed  $2.5
million.  See "THE  MERGER --The  Merger Agreement  -- EXPENSES  AND TERMINATION
FEE."

THE STOCK OPTION AGREEMENT

    In connection with and as a condition to COMSAT's willingness to enter  into
the  Merger Agreement, COMSAT and RSi entered into a Stock Option Agreement (the
"Stock Option Agreement") pursuant to which  RSi granted to COMSAT an option  to
purchase  1,242,778 shares of  RSi Common Stock, which  represents the number of
shares equal to 15% of the shares of RSi Common Stock outstanding on January 30,
1994, the date of the Stock Option Agreement, at an exercise price of $18.25 per
share, on the terms described under "THE MERGER -- The Stock Option  Agreement."
The  full text of  the Stock Option Agreement  is attached as  Exhibit B to this
Proxy Statement/Prospectus and should be read carefully in its entirety.

CERTAIN FEDERAL INCOME TAX CONSEQUENCES OF THE MERGER

    It is anticipated that  the Merger will  constitute a reorganization  within
the  meanings of Sections 368(a)(1)(A) and  368(a)(2)(D) of the Internal Revenue
Code of  1986,  as  amended. See  "THE  MERGER  -- Certain  Federal  Income  Tax
Consequences" for a discussion of certain federal income tax consequences of the
Merger.

ACCOUNTING TREATMENT

    COMSAT  and  RSi  believe that  the  Merger  will qualify  as  a  pooling of
interests for accounting and financial reporting purposes. It is a condition  to
the  obligation of  the parties  to consummate  the Merger  that COMSAT  and RSi
receive a letter from Deloitte & Touche, independent public accountants for both
COMSAT and RSi,  to that  effect. See  "THE MERGER  -- The  Merger Agreement  --
CONDITIONS TO THE MERGER" and "-- Accounting Treatment."

APPRAISAL RIGHTS

    Holders of RSi Common Stock are not entitled to dissenters' appraisal rights
under  the Nevada General Corporation Law  in connection with the Merger because
the RSi  Common Stock  is listed  for quotation  on the  NASDAQ National  Market
System  (the "NASDAQ/NMS") and the shares of COMSAT Common Stock to be issued in
the Merger will be listed on the NYSE. See "THE MERGER -- Appraisal Rights."

COMPARISON OF RIGHTS OF SHAREHOLDERS OF RSI AND COMSAT UNDER APPLICABLE LAWS

    The rights  of stockholders  of  RSi currently  are governed  by  applicable
Nevada law, including the Nevada General Corporation Law (the "Nevada Law"), the
Restated  Articles of Incorporation of RSi, as amended (the "RSi Articles"), and
the RSi By-Laws,  as amended  (the "RSi By-Laws").  On the  Effective Date,  the
stockholders  of RSi will become shareholders  of COMSAT, a District of Columbia
corporation, and their rights as shareholders of COMSAT will be governed by  the
Satellite  Act and, to the extent that it is not inconsistent with the Satellite
Act, by applicable District of Columbia law, including the District of  Columbia
Business  Corporation  Act  (the "D.C.  Act"),  and  by the  COMSAT  Articles of
Incorporation, as amended (the  "COMSAT Articles"), and  the COMSAT By-Laws,  as
amended (the "COMSAT By-Laws").

    There  are numerous important differences between the rights of stockholders
of RSi under the Nevada Law, the RSi Articles and the RSi By-Laws and the rights
of shareholders of  COMSAT under  the Satellite Act,  the D.C.  Act, the  COMSAT
Articles  and the COMSAT By-Laws, including, among other things, with respect to
COMSAT, the requirements of having  three Presidentially appointed directors  on
the  COMSAT Board of Directors, the requirement  of FCC approval with respect to
certain financing activities,  restrictions on the  issuance, ownership,  voting
and  transfer  of  COMSAT  capital stock,  and  special  provisions  relating to
communications common carriers.  See "DESCRIPTION OF  COMSAT CAPITAL STOCK"  and
"COMPARISON OF RIGHTS OF SHAREHOLDERS OF RSi AND COMSAT."

                                      viii
<PAGE>
           SELECTED HISTORICAL AND UNAUDITED PRO FORMA FINANCIAL DATA

    The  following tables present  selected historical financial  data of COMSAT
and RSi and selected  pro forma combined financial  data after giving effect  to
the  Merger under  the pooling of  interests method of  accounting. COMSAT's and
RSi's selected historical financial data as of the end of and for each of  their
respective  last  five fiscal  years have  been  derived from  audited financial
statements. RSi's selected historical financial data as of the end of or for the
first six months of  its fiscal years  ending June 30, 1994  and 1993 have  been
derived  from  unaudited  financial  statements and,  in  the  opinion  of RSi's
management,  include  all  adjustments,  consisting  of  only  normal  recurring
adjustments,  necessary for a fair presentation of the results of operations for
such interim period.

    The selected pro  forma financial data  have been derived  from or  prepared
consistently   with  the  unaudited  pro   forma  combined  condensed  financial
statements included herein. The  pro forma data  are presented for  illustrative
purposes  only and are  not necessarily indicative of  the financial position or
operating results that would have occurred or that will occur upon  consummation
of  the  Merger.  The  following  selected  financial  data  should  be  read in
conjunction with such historical and pro forma combined financial statements and
notes thereto incorporated by reference  or included herein. See  "INCORPORATION
OF  CERTAIN DOCUMENTS BY REFERENCE,"  "COMSAT CORPORATION AND RADIATION SYSTEMS,
INC. UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS" and "RADIATION
SYSTEMS, INC. CONSOLIDATED FINANCIAL STATEMENTS."

                                       ix
<PAGE>
                               COMSAT CORPORATION
                            SELECTED FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                                               YEAR ENDED DECEMBER 31,
                                                              ----------------------------------------------------------
                                                                 1993      1992(2)       1991      1990(2)       1989
                                                              ----------  ----------  ----------  ----------  ----------
<S>                                                           <C>         <C>         <C>         <C>         <C>
INCOME STATEMENT DATA:
Revenues....................................................  $  640,390  $  563,615  $  522,850  $  456,806  $  411,524
Operating Income (Loss).....................................     138,098      88,505     127,473     (12,551)     86,093
Income (Loss) Before Cumulative Effect of Changes in
 Accounting Principles......................................      74,044      42,924      71,424     (16,349)     62,464
Income (Loss) Per Share Before Cumulative Effect of Changes
 in Accounting Principles (1):
  Primary...................................................  $     1.82  $     1.09  $     1.88  ($    0.44) $     1.67
  Fully Diluted.............................................  $     1.82  $     1.09  $     1.80  ($    0.44) $     1.50

<CAPTION>
                                                                                     DECEMBER 31,
                                                              ----------------------------------------------------------
                                                                 1993        1992        1991        1990        1989
                                                              ----------  ----------  ----------  ----------  ----------
<S>                                                           <C>         <C>         <C>         <C>         <C>
BALANCE SHEET DATA:
Total Assets................................................  $1,652,515  $1,542,843  $1,369,546  $1,209,565  $1,261,110
Long-Term Debt..............................................     402,402     486,383     382,764     375,181     367,617
Stockholders' Equity........................................     679,352     621,132     584,986     558,064     595,138
<FN>
- ------------------------------
(1)   Per share amounts have been adjusted for a two-for-one stock split in June
      1993.
(2)   Operating results are net of restructuring charges of $38,961,000 in  1992
      and $97,576,000 in 1990.
</TABLE>

                            RADIATION SYSTEMS, INC.
                            SELECTED FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                       SIX MONTHS ENDED
                                                         DECEMBER 31,                  YEAR ENDED JUNE 30,
                                                      ------------------  ----------------------------------------------
                                                        1993      1992      1993      1992      1991     1990     1989
                                                      --------  --------  --------  --------  --------  -------  -------
<S>                                                   <C>       <C>       <C>       <C>       <C>       <C>      <C>
INCOME STATEMENT DATA:
Revenues (1)........................................  $ 53,862  $ 61,753  $121,786  $128,442  $115,519  $85,230  $54,914
Operating Income....................................     5,541     7,715    15,656    16,755    13,558    9,021    4,738
Income Before Cumulative Effect of Changes in
 Accounting Principles..............................     3,315     4,820    10,240    10,585     8,369    5,644    3,317
Income Per Share Before Cumulative Effect of Changes
 in Accounting Principles (2).......................  $   0.40  $   0.58  $   1.23  $   1.27  $   1.01  $  0.69  $  0.42

<CAPTION>
                                                         DECEMBER 31,                        JUNE 30,
                                                      ------------------  ----------------------------------------------
                                                        1993      1992      1993      1992      1991     1990     1989
                                                      --------  --------  --------  --------  --------  -------  -------
<S>                                                   <C>       <C>       <C>       <C>       <C>       <C>      <C>
BALANCE SHEET DATA:
Total Assets........................................  $126,532  $113,631  $123,375  $113,572  $ 99,473  $95,936  $75,520
Long-Term Debt......................................     8,148    10,421     9,467     9,845     6,509    8,881    6,543
Stockholders' Equity................................    89,186    81,160    85,599    79,037    66,270   57,449   52,107
<FN>
- ------------------------------
(1)   Includes  business interruption insurance proceeds of $2,996,000 in fiscal
      year 1993, $1,306,000  in fiscal  year 1992,  $827,000 in  the six  months
      ended  December 31, 1993 and $802,000 in the six months ended December 31,
      1992.
(2)   Per share amounts have  been adjusted for a  three-for-two stock split  in
      fiscal year 1992.
</TABLE>

                                       x
<PAGE>
                 COMSAT CORPORATION AND RADIATION SYSTEMS, INC.
                   SELECTED PRO FORMA COMBINED FINANCIAL DATA
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                      YEAR ENDED DECEMBER 31,
                                                    ----------------------------
                                                      1993      1992      1991
                                                    --------  --------  --------
<S>                                                 <C>       <C>       <C>
PRO FORMA COMBINED INCOME STATEMENT DATA:
Revenues..........................................  $754,285  $688,093  $651,211
Operating Income..................................   151,580   104,982   142,712
Income Before Cumulative Effect of Changes in
 Accounting Principles............................    82,469    53,292    81,014
Income Per Share Before Cumulative Effect of
 Changes in Accounting Principles, Assuming
 Conversion Fraction of:
  Minimum Fraction of .638  Primary...............  $   1.80  $   1.19  $   1.87
                          Fully Diluted...........  $   1.79  $   1.19  $   1.80
  Average Fraction of .709   Primary..............  $   1.77  $   1.18  $   1.84
                          Fully Diluted...........  $   1.77  $   1.17  $   1.78
  Maximum Fraction of .780  Primary...............  $   1.75  $   1.16  $   1.82
                           Fully Diluted..........  $   1.75  $   1.16  $   1.75
</TABLE>

<TABLE>
<CAPTION>
                                                               DECEMBER 31, 1993
                                                               -----------------
<S>                                                            <C>
PRO FORMA COMBINED BALANCE SHEET DATA:
Total Assets................................................   $     1,773,949
Long-Term Debt..............................................           410,550
Stockholders' Equity........................................           758,440
<FN>
- ------------------------
1.   COMSAT  operates  and reports  on a  December 31  calendar year  basis. RSi
     operates and reports on a June 30 fiscal year basis. The pro forma combined
     income statement data combines the income statement of COMSAT for the years
     ended December 31, 1993, 1992 and 1991 with the income statement of RSi for
     the years  ended  December  31,  1993, 1992  and  1991,  respectively.  The
     calendar  year income statements for RSi  were derived by adding the income
     statements for the third and fourth  quarters of each fiscal year with  the
     first  and second  quarters of  the subsequent  fiscal year.  The pro forma
     combined balance sheet  data combines  the balance  sheet of  COMSAT as  of
     December 31, 1993 with the balance sheet of RSi as of December 31, 1993.
2.   The pro forma combined financial data includes $5,000,000 for the estimated
     transaction costs of the Merger but does not include the nonrecurring costs
     and  expenses associated  with integrating  the operations  of the combined
     companies. The costs of  integrating operations are  expected to result  in
     significant,  nonrecurring charges  to the  combined companies'  results of
     operations after consummation of the Merger; however, the actual amount  of
     such charges cannot be determined at this time.
     Pursuant  to the rules and  regulations of the SEC,  the pro forma combined
     condensed statements of income exclude the cumulative effects of accounting
     changes.
</TABLE>

                                       xi
<PAGE>
                           COMPARATIVE PER SHARE DATA

    The following table presents  COMSAT's and RSi's  historical per share  data
and  the unaudited pro forma combined per  share data after giving effect to the
Merger under the pooling of interests  method of accounting. The pro forma  data
are  presented for illustrative purposes only and are not necessarily indicative
of the financial position or operating results that would have occurred or  that
will  occur upon  consummation of  the Merger.  The information  presented below
should be  read  in conjunction  with  the  historical and  pro  forma  combined
financial  statements and  notes thereto  incorporated by  reference or included
herein.  See  "INCORPORATION  OF   CERTAIN  DOCUMENTS  BY  REFERENCE,"   "COMSAT
CORPORATION  AND RADIATION SYSTEMS, INC.  UNAUDITED PRO FORMA COMBINED CONDENSED
FINANCIAL  STATEMENTS"  and  "RADIATION  SYSTEMS,  INC.  CONSOLIDATED  FINANCIAL
STATEMENTS."

<TABLE>
<CAPTION>
                                                                                                           PRO FORMA
                                                                        HISTORICAL (3)                    EQUIVALENT
                                                                        ---------------    PRO FORMA     FOR ONE SHARE
                                                                        COMSAT    RSI     COMBINED (4)    OF RSI (4)
                                                                        ------   ------   ------------   -------------
<S>                                                                     <C>      <C>      <C>            <C>
Primary income per share before cumulative effect of changes in
 accounting principles, assuming Conversion Fraction of (1):
  Minimum Fraction of .638
    Year ended December 31,
      1993............................................................  $1.82    $ 1.01   $    1.80      $     1.15
      1992............................................................  1.09  (2)   1.24       1.19            0.76
      1991............................................................  1.88       1.15        1.87            1.19
  Average Fraction of .709
    Year ended December 31,
      1993............................................................  $1.82    $ 1.01   $    1.77      $     1.25
      1992............................................................  1.09  (2)   1.24       1.18            0.84
      1991............................................................  1.88       1.15        1.84            1.30
  Maximum Fraction of .780
    Year ended December 31,
      1993............................................................  $1.82    $ 1.01   $    1.75      $     1.37
      1992............................................................  1.09  (2)   1.24       1.16            0.90
      1991............................................................  1.88       1.15        1.82            1.42
Cash dividends declared per share (1), (5):
  Minimum Fraction of .638
    Year ended December 31,
      1993............................................................  $0.74    $ 0.10   $    0.74      $     0.47
      1992............................................................  0.70       0.09        0.70            0.45
      1991............................................................  0.67       0.07        0.67            0.43
  Average Fraction of .709
    Year ended December 31,
      1993............................................................  $0.74    $ 0.10   $    0.74      $     0.52
      1992............................................................  0.70       0.09        0.70            0.50
      1991............................................................  0.67       0.07        0.67            0.48
  Maximum Fraction of .780
    Year ended December 31,
      1993............................................................  $0.74    $ 0.10   $    0.74      $     0.58
      1992............................................................  0.70       0.09        0.70            0.55
      1991............................................................  0.67       0.07        0.67            0.52
Book value per share (1):
  December 31,1993
    Minimum Fraction of .638..........................................  $16.89   $10.76   $   16.76      $    10.69
    Average Fraction of .709..........................................  16.89     10.76       16.55           11.73
    Maximum Fraction of .780..........................................  16.89     10.76       16.36           12.76
<FN>
- ------------------------------
(1)   COMSAT  operates and  reports on  a December  31 calendar  year basis. RSi
      operates and  reports  on a  June  30 fiscal  year  basis. The  pro  forma
      combined  primary income per  share and cash  dividends declared per share
      information combines the data of COMSAT  for the years ended December  31,
      1993,  1992 and 1991 with the data of RSi for the years ended December 31,
      1993, 1992 and  1991, respectively. The  calendar year data  for RSi  were
      derived  by adding RSi's information for  the third and fourth quarters of
      each fiscal year  with the  first and  second quarters  of the  subsequent
      fiscal year. The pro forma combined book value per share data combines the
      balance  sheet of COMSAT as of December 31, 1993 with the balance sheet of
      RSi as of December 31, 1993.
</TABLE>

                                      xii
<PAGE>

<TABLE>
<S>   <C>
(2)   In 1992, COMSAT  recorded a  restructuring charge  of $38,961,000.  Absent
      this charge, COMSAT's earnings per share were $1.69 for 1992.
(3)   Per share amounts for COMSAT have been adjusted for a two-for-one split in
      1993.  Per share  amounts for RSi  have been adjusted  for a three-for-two
      stock split in 1991.
(4)   The pro forma combined  financial information has  been prepared based  on
      the pooling of interests method of accounting assuming that .638, .709 and
      .780  of a share of  COMSAT Common Stock are issued  for each share of RSi
      Common Stock. These  numbers represent  the minimum,  average and  maximum
      possible  values,  respectively,  for the  Conversion  Fraction.  See "THE
      MERGER -- General Description of the Merger".
(5)   The pro forma combined cash dividends declared per share reflect  COMSAT's
      cash dividends declared in the periods presented.
</TABLE>

                       COMPARATIVE PER SHARE MARKET DATA

    COMSAT  Common Stock is listed and primarily  traded on the NYSE. RSi Common
Stock is listed and traded on the NASDAQ/NMS.

<TABLE>
<CAPTION>
                                                                                                              PRO FORMA
                                                        RSI           MERGER VALUE OF          COMSAT         EQUIVALENT
                                                    COMMON STOCK        ONE SHARE OF        COMMON STOCK    FOR ONE SHARE
DATES                                             (HISTORICAL) (1)  RSI COMMON STOCK (2)  (HISTORICAL) (1)    OF RSI (3)
- ------------------------------------------------  ----------------  --------------------  ----------------  --------------
<S>                                               <C>               <C>                   <C>               <C>
January 28, 1994................................  $      13 1/2     $         18.25       $      26 7/8            .679
May 2, 1994.....................................  $      16 3/8     $         16.67       $      21 3/8            .780
<FN>
- ------------------------
(1)   The historical  values  of  RSi  Common  Stock  and  COMSAT  Common  Stock
      represent the closing sale prices on (a) January 28, 1994, the trading day
      immediately prior to the public announcement of the Merger, and (b) May 2,
      1994,  the last practicable date prior to mailing of this Proxy Statement/
      Prospectus.
(2)   The Merger Agreement provides that each share of RSi Common Stock will  be
      converted  into that fraction of a share of COMSAT Common Stock determined
      by dividing $18.25 by the average closing price of the COMSAT Common Stock
      on the NYSE Composite Tape during the 20 trading days ending five  trading
      days  prior to  the date of  the Closing (the  "Average Price"); PROVIDED,
      that the Conversion Fraction shall not be less than .638 and shall not  be
      greater  than .780. If  the Average Price  were equal to  the closing sale
      price of COMSAT Common Stock on January 28, 1994 ($26 7/8), the Conversion
      Fraction would be .679 and  the "Merger Value of  One Share of RSi  Common
      Stock"  would be $18.25.  If the Average  Price were equal  to the closing
      sale price of COMSAT Common Stock on May 2, 1994 ($21 3/8), the Conversion
      Fraction would be the maximum Conversion Fraction of .780 and the  "Merger
      Value of One Share of RSi Common Stock" would be $16.67. THE AVERAGE PRICE
      WILL  BE DETERMINED, AND THE CONVERSION  FRACTION FIXED, FIVE TRADING DAYS
      PRIOR TO THE  DATE OF THE  CLOSING, WHICH RSI  AND COMSAT ANTICIPATE  WILL
      OCCUR  ON THE DAY  OF THE SPECIAL  MEETING. RSI STOCKHOLDERS  ARE URGED TO
      OBTAIN CURRENT MARKET QUOTATIONS FOR THE  COMSAT COMMON STOCK AND THE  RSI
      COMMON STOCK BEFORE DECIDING HOW TO VOTE.
(3)   The  "Pro Forma Equivalent For One Share of RSi" indicates the fraction of
      a share of COMSAT Common Stock  (which, under the Merger Agreement,  shall
      not  be less than .638 and shall not  be greater than .780) which would be
      received upon the conversion of a share of RSi Common Stock in the  Merger
      if  the Average  Price were  equal to  the historical  per share  price of
      COMSAT Common Stock on the date specified. The actual Average Price may be
      higher or lower than that shown. See also "COMPARATIVE MARKET PRICE DATA."
</TABLE>

                                      xiii
<PAGE>

<TABLE>
<S>                                        <C>
           PROXY STATEMENT                              PROSPECTUS
               [LOGO]                                     [LOGO]
</TABLE>

    This   Proxy  Statement/Prospectus  (the  "Proxy  Statement/Prospectus")  is
provided to the stockholders  of Radiation Systems,  Inc., a Nevada  corporation
("RSi"),  in connection  with the  special meeting  of stockholders  of RSi (the
"Special Meeting") and  any adjournments or  postponements thereof. The  Special
Meeting  will be held on the date, at the time, and in the location, and will be
held to consider the matter, set forth under "THE SPECIAL MEETING." The Board of
Directors of RSi (the "RSi Board") is  soliciting proxies hereby for use at  the
Special  Meeting. A form of  proxy is being provided  to the stockholders of RSi
with this Proxy Statement/Prospectus. Information with respect to the  execution
and the revocation of proxies is provided under "THE SPECIAL MEETING."

    In  addition, this  Proxy Statement/Prospectus  serves as  the prospectus of
COMSAT Corporation, a  District of  Columbia corporation  ("COMSAT"), under  the
Securities  Act of 1933, as amended (the  "Securities Act"), for the issuance of
the shares of common stock, without par value, of COMSAT ("COMSAT Common Stock")
into which shares  of common  stock, par  value $1.00  per share,  of RSi  ("RSi
Common  Stock") will  be converted upon  consummation of the  Merger (as defined
below).

                              THE SPECIAL MEETING

PURPOSE OF THE MEETING
    At the  Special Meeting  and any  adjournment or  postponement thereof,  the
holders  of RSi Common Stock will be asked  to consider and vote upon a proposal
to approve and adopt the Agreement and Plan of Merger (the "Merger  Agreement"),
dated  as  of January  30,  1994, among  RSi, COMSAT  and  CTS America,  Inc., a
Delaware  corporation  that  is  a  wholly  owned  subsidiary  of  COMSAT  ("CTS
America"),  pursuant to which, among  other things, (a) RSi  will merge with and
into CTS  America  and  CTS  America will  be  the  surviving  corporation  (the
"Merger"),  and  (b)  each share  of  RSi  Common Stock  issued  and outstanding
immediately prior to the effective date of the Merger, other than shares held by
RSi, COMSAT or a subsidiary  of RSi or of COMSAT,  shall be converted into  that
fraction (the "Conversion Fraction") of a fully paid and non-assessable share of
COMSAT  Common Stock, rounded to the  nearest thousandth, determined by dividing
$18.25 by the average closing price  (the "Average Price") of the COMSAT  Common
Stock  on the New York Stock Exchange  (the "NYSE") Composite Tape during the 20
trading days ending five trading  days prior to the date  of the closing of  the
transactions  contemplated by  the Merger  Agreement (the  "Closing"); PROVIDED,
that the  Conversion Fraction  shall not  be less  than .638  and shall  not  be
greater  than .780, and that cash shall be paid in lieu of fractional shares. If
the Average Price is between $23.40 and $28.60, the Conversion Fraction will  be
between  .780 and .638. If  the Average Price is  $23.40 or less, the Conversion
Fraction will be fixed at .780. If  the Average Price is $28.60 or greater,  the
Conversion Fraction will be fixed at .638. THE AVERAGE PRICE WILL BE DETERMINED,
AND  THE CONVERSION FRACTION WILL BE FIXED,  FIVE TRADING DAYS PRIOR TO THE DATE
OF THE CLOSING, WHICH  RSI AND COMSAT  ANTICIPATE WILL OCCUR ON  THE DAY OF  THE
SPECIAL  MEETING. RSI STOCKHOLDERS ARE URGED TO OBTAIN CURRENT MARKET QUOTATIONS
FOR THE COMSAT COMMON STOCK  AND RSI COMMON STOCK  BEFORE DECIDING HOW TO  VOTE.
See also "COMPARATIVE MARKET PRICE DATA."

    THE  RSI  BOARD  UNANIMOUSLY  HAS  APPROVED  THE  MERGER  AGREEMENT  AND THE
TRANSACTIONS  CONTEMPLATED  THEREBY,   AND  UNANIMOUSLY   RECOMMENDS  THAT   THE
STOCKHOLDERS OF RSI VOTE "FOR" APPROVAL AND ADOPTION OF THE MERGER AGREEMENT AND
THE  TRANSACTIONS CONTEMPLATED THEREBY. SEE "THE MERGER -- RECOMMENDATION OF THE
RSI BOARD OF DIRECTORS; RSI'S REASONS FOR THE MERGER."

DATE, TIME AND PLACE; RECORD DATE

    The Special Meeting is scheduled  to be held at  10:00 a.m., local time,  on
Friday,  June 3,  1994 at  Holiday Inn  Washington --  Dulles, 1000  Sully Road,
Sterling,  Virginia   22170.   The   RSi   Board  has   fixed   the   close   of
<PAGE>
business  on  April 4,  1994  as the  record date  (the  "Record Date")  for the
determination of holders of RSi Common Stock  entitled to notice of and to  vote
at  the Special Meeting. On the Record  Date, there were 8,285,187 shares of RSi
Common Stock issued and outstanding.

VOTING RIGHTS

    The affirmative  vote  of  the  holders  of  at  least  a  majority  of  the
outstanding  shares of  RSi Common  Stock is  required under  the Nevada General
Corporation Law (the "Nevada Law") and the Restated Articles of Incorporation of
RSi, as amended (the "RSi Articles"), to approve and adopt the Merger  Agreement
and the transactions contemplated thereby. Holders of record of RSi Common Stock
on  the Record Date  are entitled to  one vote per  share on the  proposal to be
presented to stockholders at the Special Meeting. The presence, either in person
or by proxy, of the holders of 40% of the outstanding shares of RSi Common Stock
entitled to vote at the Special Meeting  is necessary to constitute a quorum  at
the Special Meeting.

    If  a stockholder attends the Special Meeting, he or she may vote by ballot.
However, many of RSi's stockholders may be unable to attend the Special Meeting.
Therefore, the RSi Board is soliciting proxies so that each holder of RSi Common
Stock on the  Record Date  has the  opportunity to vote  on the  proposal to  be
considered at the Special Meeting. When a proxy card is returned properly signed
and  dated, the shares represented thereby will  be voted in accordance with the
instructions on the proxy card. If a stockholder does not return a signed  proxy
card,  his or her shares will not be voted  and, thus, will have the effect of a
vote against the  Merger Agreement  and the  transactions contemplated  thereby.
Each  stockholder is urged to mark the box on the proxy card to indicate how his
or her shares are to be voted. If a stockholder returns a signed proxy card  but
does  not indicate how his or her shares are to be voted, the shares represented
by the  proxy card  will be  voted "FOR"  approval and  adoption of  the  Merger
Agreement  and the transactions contemplated thereby. If a shareholder returns a
signed proxy card but marks the box indicating an abstention, his or her  shares
will  be considered present at the Special  Meeting, but because the shares have
not been  voted "FOR"  approval of  the Merger  Agreement and  the  transactions
contemplated  thereby, the abstention will have the effect of a vote against the
proposal. Persons whose shares  are held in  "street name" by  a broker and  who
wish  to attend the Special Meeting must  obtain a letter of identification from
the broker and  bring it to  the Special  Meeting. In order  to vote  personally
shares  held in street name,  such persons must obtain  a proxy from the broker.
Under the rules  of the NYSE,  brokers who hold  shares of RSi  Common Stock  in
street  name for customers may not vote such shares with respect to approval and
adoption of  the  Merger Agreement  and  the transactions  contemplated  thereby
without  specific voting  instructions from such  customers. Shares  for which a
broker withholds authority  to vote  (broker non-votes) will  not be  considered
present at the Special Meeting with respect to the proposal to approve and adopt
the  Merger Agreement and the transactions contemplated thereby, and such broker
non-votes will have  the effect of  votes against the  proposal. The proxy  card
also  confers discretionary  authority on the  individuals appointed  by the RSi
Board and named  on the proxy  card to  vote shares represented  thereby on  any
other matter that is properly presented for action at the Special Meeting.

    Any  stockholder who executes and returns a proxy card may revoke such proxy
at any  time before  it  is voted  by (i)  notifying  in writing  the  Corporate
Secretary  of RSi at 1501 Moran Road,  Sterling, Virginia 20166, (ii) granting a
subsequent proxy,  or  (iii) appearing  in  person  and voting  at  the  Special
Meeting.  Attendance at the Special Meeting will not in and of itself constitute
revocation of a proxy.

    Each participant and beneficiary  in the RSi  Employee Stock Ownership  Plan
(the "ESOP") will receive a form to be used to instruct the trustees of the ESOP
how  to vote the  RSi Common Stock  held by the  ESOP that is  allocated to such
participant  or  beneficiary.  The  ESOP  provides  that  each  participant   or
beneficiary  shall direct  the trustees of  the ESOP  as to the  manner in which
shares allocated to such  participant or beneficiary are  to be voted. The  ESOP
provides  that the trustees will  vote such shares as  instructed. The ESOP does
not contain a provision instructing the trustees of the ESOP as to the voting of
allocated shares for which  the trustees have not  received directions from  the
applicable  participant or beneficiary. The trustees  will vote such shares in a
manner consistent with the voting of  the allocated shares for which  directions
have  been  received unless,  in  the trustees'  opinion,  such action  would be
inconsistent with their

                                       2
<PAGE>
fiduciary  duties  to  the  ESOP  or  otherwise  inconsistent  with   applicable
regulations. The ESOP also provides that the trustees of the ESOP shall vote all
unallocated  shares  in a  manner consistent  with the  voting of  the allocated
shares unless, in the trustees' opinion, such action would be inconsistent  with
their  fiduciary duties  to the ESOP  or otherwise  inconsistent with applicable
regulations. The trustees of  the ESOP are Mark  D. Funston and Anita  Stutzman,
officers  of RSi, and  George Reed, all of  whom are employees  of RSi. See "THE
MERGER -- Interests of Certain Persons in the Merger; Employment Agreements."

    The directions of participants and beneficiaries regarding the voting of the
shares allocated to them will not be disclosed to COMSAT, RSi or the trustees of
the ESOP, and will be  tabulated by Wachovia Bank  of North Carolina, N.A.,  the
transfer agent of the RSi Common Stock (the "Transfer Agent"). See "RSi TRANSFER
AGENT."

    To  be effective, directions to the trustees of the ESOP must be received by
the Transfer Agent at Wachovia Corporate Trust, 301 North Church, Second  Floor,
Winston-Salem,  North Carolina 27102, Attention: Stock Transfer, by the close of
business (5:00 p.m. EDT)  on June 2, 1994.  Directions to the trustees  received
after the close of business on June 2, 1994, or received at a different address,
will not be effective. A participant or beneficiary in the ESOP who is otherwise
an  RSi  stockholder  should (i)  complete  and  return directions  to  the ESOP
trustees with respect to RSi Common Stock held by the ESOP that is allocated  to
such  participant or beneficiary and (ii) complete and return the enclosed proxy
with respect to such other RSi Common Stock.

    No vote of the shareholders  of COMSAT is required  to approve or adopt  the
Merger  Agreement or the  transactions contemplated thereby  or to authorize the
issuance of COMSAT Common Stock in the Merger.

                         OWNERSHIP OF RSI COMMON STOCK

    As of  the  Record  Date,  RSi's directors,  executive  officers  and  their
affiliates  as a group owned 3.32% of the shares of RSi Common Stock outstanding
and entitled to vote at the Special Meeting, including 32,808 shares held in the
executive officers' accounts in the ESOP. As of the Record Date, the ESOP  owned
10.63% of the shares of RSi Common Stock outstanding and entitled to vote at the
Special  Meeting, of  which 407,799  shares (4.92% of  the shares  of RSi Common
Stock outstanding  and  entitled to  vote  at  the Special  Meeting)  have  been
allocated  to participants  and beneficiaries and  473,273 shares  (5.71% of the
shares of  RSi Common  Stock outstanding  and entitled  to vote  at the  Special
Meeting) are unallocated. The trustees of the ESOP are Mark D. Funston and Anita
M. Stutzman, officers of RSi, and George Reed, all of whom are employees of RSi.
See "THE SPECIAL MEETING -- Voting Rights."

    As  of the  Record Date,  COMSAT held  404,500 shares  of RSi  Common Stock,
representing approximately 4.9% of the votes  entitled to be cast by holders  of
RSi Common Stock at the Special Meeting.

    Since  the date as of which information was presented in the proxy statement
for RSi's 1993 annual  meeting of stockholders, there  have been changes in  the
beneficial ownership of certain beneficial owners of RSi Common Stock.

    The only persons known to RSi to be beneficial owners of more than 5% of the
RSi Common Stock as of the Record Date are as follows:

<TABLE>
<CAPTION>
                                                                             NUMBER OF SHARES     PERCENT OF
NAME AND ADDRESS OF BENEFICIAL OWNER                                        BENEFICIALLY OWNED      CLASS
- -------------------------------------------------------------------------  --------------------   ----------
<S>                                                                        <C>                    <C>
Trustees of the Radiation Systems, Inc...................................           473,273(1)       5.71%
  Employee Stock Ownership Plan
  1501 Moran Road
  Sterling, VA 20166
<FN>
- ------------------------
(1)   The  trustees shall  vote such shares,  and such of  the 407,799 allocated
      shares for which  no direction  has been received,  in a  manner which  is
      proportionate  with the  voting of such  of the 407,799  shares which have
      been  allocated  to  participants  and  beneficiaries  for  which   voting
      direction has been received,
</TABLE>

                                       3
<PAGE>
<TABLE>
<S>   <C>
      unless,  in the trustees' opinion, such  action would be inconsistent with
      their  fiduciary  duties  to  the  ESOP  or  otherwise  inconsistent  with
      applicable regulations. See "THE SPECIAL MEETING -- Voting Rights."
</TABLE>

    The  following table sets forth the beneficial ownership of RSi Common Stock
as of the Record Date by all RSi  directors, by each of the named RSi  executive
officers and by all directors and executive officers as a group.

<TABLE>
<CAPTION>
                                                                                 AMOUNT & NATURE OF
                                                                                     BENEFICIAL          PERCENT OF
NAME OF BENEFICIAL OWNER                                                          OWNERSHIP(1)(2)           CLASS
- ----------------------------------------------------------------------------  ------------------------  -------------
<S>                                                                           <C>                       <C>
DIRECTORS
Calhoun J. Killeen..........................................................           18,250                 *
Lee M. Paschall.............................................................           30,687                 *
Irvin G. Ray................................................................           23,450                 *
John D. Sanders.............................................................           23,325                 *
EXECUTIVE OFFICERS
Richard E. Thomas (3).......................................................          161,960(4)               1.9%
Junius H. Arnold, Jr........................................................           16,045(4)              *
Mark D. Funston.............................................................           28,731(4)              *
R. Doss McComas.............................................................           28,682(4)              *
Marvin D. Shoemake..........................................................           32,007(4)              *
All directors and executive officers as a group (16 persons)................          453,617(4)              5.36%
<FN>
- ------------------------
 *    Less than 1%.
(1)   Includes  shares that may  be acquired within  60 days of  the Record Date
      upon exercise  of  outstanding options  as  follows: Mr.  Killeen,  18,250
      shares;  Mr. Paschall, 10,000 shares; Mr. Ray, 20,000 shares; Mr. Sanders,
      20,000 shares; Mr. Funston, 20,000 shares; Mr. McComas, 20,000 shares; Mr.
      Shoemake, 10,000 shares;  and all  directors and executive  officers as  a
      group,  178,250  shares. Does  not include  shares subject  to outstanding
      options containing  change-in-control  acceleration provisions  that  have
      been waived by the holders thereof as follows: Mr. Funston, 20,000 shares;
      Mr. McComas, 20,000 shares; Mr. Shoemake, 20,000 shares; and all directors
      and  executive  officers as  a group,  90,000 shares.  See "THE  MERGER --
      Interests of Certain Persons in the Merger; Employment Agreements."
(2)   Mr. Paschall has sole voting and  investment power for 19,187 shares;  Mr.
      Sanders,  for 3,325 shares;  Mr. Funston, for  6,450 shares; Mr. Shoemake,
      for 19,184 shares;  Mr. McComas,  for 1,901  shares; and  Mr. Thomas,  for
      22,500  shares. Mr. Paschall has shared  investment power by virtue of his
      wife's ownership and will of 1,500  shares. Mr. Ray has shared voting  and
      investment  power  with respect  to 3,450  shares;  Mr. Arnold,  by trust,
      12,875 shares; Mr. McComas, 4,500 shares; and Mr. Thomas, 133,810  shares.
      Mr.  Thomas disclaims beneficial  ownership of an  additional 7,099 shares
      owned by his brother and adult children.
(3)   Mr. Thomas is also a director of RSi.
(4)   The shares  of RSI  Common  Stock held  in  the executive  officers'  ESOP
      accounts  are included as  follows: Mr. Thomas,  5,650 shares; Mr. Arnold,
      3,170 shares; Mr. Funston,  2,281 shares; Mr.  McComas, 2,281 shares;  Mr.
      Shoemake,  2,823 shares;  and all  directors and  executive officers  as a
      group, 32,808 shares.
</TABLE>

                                       4
<PAGE>
                                   THE MERGER

    THE FOLLOWING IS  A BRIEF  SUMMARY OF CERTAIN  ASPECTS OF  THE MERGER.  THIS
SUMMARY  DOES NOT  PURPORT TO BE  COMPLETE AND  IS QUALIFIED IN  ITS ENTIRETY BY
REFERENCE  TO  THE   MERGER  AGREEMENT,   WHICH  IS  ATTACHED   TO  THIS   PROXY
STATEMENT/PROSPECTUS AS EXHIBIT A AND IS INCORPORATED HEREIN BY REFERENCE.

GENERAL DESCRIPTION OF THE MERGER

    On the Effective Date (as defined below under "-- Closing; Effective Date"),
RSi  will be merged with and into CTS America,  and RSi will cease to exist as a
separate corporation.  CTS America  will  be the  surviving corporation  in  the
Merger and will continue as a wholly owned subsidiary of COMSAT.

    On  the Effective Date, each share of RSi Common Stock then outstanding will
be converted into  that fraction  of a fully  paid and  non-assessable share  of
COMSAT  Common Stock equal to  the Conversion Fraction, which  shall not be less
than .638 nor  greater than .780,  except that  all shares of  RSi Common  Stock
owned  by RSi, COMSAT  or any subsidiaries  of either of  them will be cancelled
pursuant to the Merger  Agreement. No fractional shares  of COMSAT Common  Stock
will  be issued in the Merger, and holders  of RSi Common Stock whose shares are
converted in the Merger will be entitled to a cash payment in lieu of fractional
shares of COMSAT Common Stock as described under "-- No Fractional Shares."

    A description  of the  relative rights,  privileges and  preferences of  the
COMSAT  capital  stock,  including  certain differences  between  the  rights of
holders of  COMSAT  Common  Stock and  RSi  Common  Stock, is  set  forth  under
"DESCRIPTION  OF COMSAT CAPITAL STOCK" and "COMPARISON OF RIGHTS OF SHAREHOLDERS
OF RSi AND COMSAT."

BACKGROUND OF THE MERGER

    In 1991, in  connection with  RSi's strategy  of developing  a full  systems
integration  capability  and expanding  into  international markets,  Richard E.
Thomas, the Chairman of the Board, President and Chief Executive Officer of RSi,
indicated to COMSAT that RSi would  be interested in acquiring COMSAT's  systems
integration  business, COMSAT Technology Services  ("CTS"). On several occasions
in 1991  and  1992,  Mr.  Thomas and  Bruce  L.  Crockett,  COMSAT's  President,
discussed  the businesses of RSi and CTS  and the possibility that in the future
COMSAT might be interested in pursuing business transactions with RSi. Over  the
course of these discussions, Mr. Thomas and Mr. Crockett considered the possible
acquisition of CTS by RSi, the possible acquisition of RSi by COMSAT and teaming
or  subcontracting arrangements  between RSi and  COMSAT. In  addition, in April
1992, C. Thomas  Faulders, III, Vice  President and Chief  Financial Officer  of
COMSAT,  met with Mr. Thomas to learn  more about RSi's business and operations.
Further, Mr. Crockett arranged  to give Mr.  Thomas information regarding  CTS's
business and operations.

    Mr.  Thomas from time to time advised  the RSi Board of his discussions with
Mr. Crockett in  1991 and  1992 and  the possibility that  at some  time in  the
future  COMSAT  might be  interested  in a  business  combination with  RSi. The
specific structure or terms of a transaction, however, were not discussed during
this period.

    In March 1993, Mr.  Crockett indicated to Mr.  Thomas that Mr. Crockett  was
now  prepared to talk further regarding a  possible acquisition of RSi by COMSAT
if Mr. Thomas  were interested  in such  a transaction  with COMSAT  and if  Mr.
Thomas  would be willing to  commit to heading up a  combination of RSi and CTS.
Mr. Thomas  and  Mr.  Crockett  then discussed  COMSAT's  interest  in  such  an
acquisition  and Mr. Thomas's continued interest  in acquiring CTS, with a focus
on the operations and potential earnings  of the combined businesses of RSi  and
CTS  and  the potential  ability  of Mr.  Thomas  and RSi  management  to reduce
overhead and other  costs and  increase the  profitability of  CTS. However,  no
specific  terms of a transaction were discussed and no formal proposal was made.
Mr. Thomas advised the RSi Board of his continuing discussions with Mr. Crockett
and the RSi Board authorized Mr.  Thomas to continue these discussions with  Mr.
Crockett,  although the authorization  did not include  authority to negotiate a
specific business  transaction  between  RSi  and COMSAT.  Mr.  Thomas  and  Mr.
Crockett  continued  their discussions  with a  meeting in  early June  1993 and
another  meeting  in  late   July  1993.  Mr.  Thomas   and  Mr.  Crockett   met

                                       5
<PAGE>
again  in mid-September 1993 and Mr. Thomas  expressed an interest in having Mr.
Crockett join the RSi Board. Mr. Crockett subsequently informed Mr. Thomas  that
he would decline to be considered for a seat on the RSi Board.

    Beginning  in late June 1993,  COMSAT began to acquire  shares of RSi Common
Stock through open market purchases.  By mid-November 1993, COMSAT had  acquired
404,500  shares (approximately 4.9%) of RSi Common Stock, at an average cost per
share of $12.60, and Mr. Crockett informed Mr. Thomas of COMSAT's acquisition of
RSi Common Stock.  The Board  of Directors of  COMSAT (the  "COMSAT Board")  was
advised  of the discussions  between Mr. Crockett  and Mr. Thomas  at the COMSAT
Board meeting on November  19, 1993, and authorized  Mr. Crockett to discuss  an
acquisition of RSi by COMSAT with Mr. Thomas.

    In  early December  1993, Mr. Crockett  and Mr. Thomas  traveled together to
China and  Hong Kong  to meet  with various  Chinese officials  and to  consider
possible  business opportunities in the Far East for their respective companies.
During this  trip Mr.  Crockett  and Mr.  Thomas  briefly discussed  a  possible
acquisition  of RSi by COMSAT; however, no specific terms of a possible business
combination between COMSAT and RSi were negotiated and Mr. Crockett indicated to
Mr. Thomas  that they  should  have further  discussions  on their  return.  Mr.
Crockett  and Mr. Thomas continued to talk during December 1993, but no specific
terms for a business  combination were discussed or  negotiated and no  specific
proposal was made.

    On  January 3,  1994, Mr. Faulders  met with  Mr. Thomas to  inform him that
COMSAT had prepared an  internal evaluation of  RSi that valued  RSi at a  range
between  $15 and $20  a share, but no  proposal was made by  Mr. Faulders or Mr.
Thomas. On January 6, 1994,  Mr. Crockett met with  Mr. Thomas and informed  him
that  COMSAT  wished  to acquire  RSi,  subject  to COMSAT  Board  approval. Mr.
Crockett told Mr. Thomas that COMSAT would want Mr. Thomas to head up a division
of COMSAT that would combine the operations of RSi and CTS, and that Mr.  Thomas
was  to bring his management approach to the newly combined division. During the
meeting they discussed the possible consideration COMSAT might be willing to pay
for RSi, and tentatively agreed that COMSAT  would consider an offer as high  as
$20  a share for RSi Common Stock,  depending upon the terms of the transaction.
Mr. Thomas and Mr.  Crockett agreed that they  would consult further with  their
respective Boards of Directors concerning COMSAT's desire to acquire RSi.

    On  January 7, 1994, Mr. Thomas met  informally with John D. Sanders and Lee
M. Paschall,  directors  of RSi,  Mark  D.  Funston, Vice  President  and  Chief
Financial Officer of RSi, and Anita M. Stutzman, Corporate Secretary of RSi, and
on  January 10,  1994 Mr.  Thomas met  informally with  Calhoun J.  Killeen, Mr.
Paschall and Mr. Sanders,  directors of RSi, Mr.  Funston and legal advisors  of
RSi.  At the January 7  and 10, 1994 meetings, Mr.  Thomas and the directors and
officers of RSi  present at the  meetings reviewed the  discussions between  Mr.
Thomas  and Mr.  Crockett regarding the  possible acquisition of  RSi by COMSAT,
including the discussions between Mr. Thomas and Mr. Crockett on January 6, 1994
regarding  the  consideration   that  COMSAT  would   consider  paying  to   RSi
stockholders  in  the transaction,  and determined  that  it was  appropriate to
convene a meeting of the RSi Board to consider the possible business combination
and, if a decision  were made by  the RSi Board to  pursue such combination,  to
retain  a financial advisor for RSi. Mr.  Thomas indicated to the members of the
RSi Board that  he would pursue  $20 in value  of COMSAT Common  Stock for  each
share  of RSi Common Stock. Mr. Thomas consulted by telephone with Irvin G. Ray,
a director of RSi, and with Mr.  Killeen regarding the matters discussed at  the
January 7, 1994 meeting, and with Mr. Ray regarding the matters discussed at the
January 10, 1994 meeting.

    On  January 11, 1994, Mr.  Faulders presented to Mr.  Thomas and Mr. Funston
certain terms and conditions of a proposed combination, including an exchange of
2/3 of a share of COMSAT  Common Stock for each share  of RSi Common Stock in  a
transaction  to be  structured as a  tax-free reorganization, a  stock option to
COMSAT to acquire 19.99% of  the RSi Common Stock at  $20 per share if RSi  were
acquired  by or entered into  an agreement to be acquired  by a party other than
COMSAT, a termination fee of $5 million plus actual expenses of up to $5 million
payable to  COMSAT  by  RSi  if  the  combination  did  not  occur  due  to  RSi
effectuating  or  agreeing to  effectuate a  combination  with another  party, a
requirement that  Mr.  Thomas execute  a  three-year employment  agreement  with
COMSAT    to    ensure   that    his    services   would    be    available   to

                                       6
<PAGE>
the combined  entity and  a  prohibition on  RSi's solicitation,  discussion  or
negotiation  of  acquisition or  other business  combination proposals  from any
other person. Mr. Faulders explained that the 2/3 ratio would provide a value of
$20 per share to RSi stockholders if COMSAT Common Stock were trading at $30 per
share, but that the actual value of the consideration to RSi stockholders  would
vary  depending  upon  the  actual  COMSAT  stock  price.  During  Mr. Faulders'
presentation, Mr. Thomas and Mr. Funston presented an alternative proposal of an
exchange of $20 in  value of COMSAT  Common Stock for each  share of RSi  Common
Stock,  but no less than .67 shares and no more than .75 shares of COMSAT Common
Stock for each share of RSi Common Stock.

    At a meeting on January 14, 1994, the RSi Board reviewed the COMSAT proposal
and the alternative proposal made by Mr. Thomas and Mr. Funston to Mr.  Faulders
on January 11, 1994, determined that evaluation of the proposals was appropriate
and  authorized Mr.  Thomas to  engage Alex.  Brown &  Sons Incorporated ("Alex.
Brown") to act  as financial  advisor to RSi  for the  proposed transaction.  On
January 15, 1994, RSi retained Alex. Brown as its financial advisor, and the RSi
directors,  Mr. Funston and R. Doss  McComas, Vice President, Strategic Planning
and International Marketing of RSi, met with Alex. Brown to discuss the proposed
transaction. On January 16, 1994, RSi and COMSAT entered into a  confidentiality
agreement and began to exchange due diligence information.

    During  the  week of  January  17, 1994,  Mr.  Thomas, Mr.  Funston  and Mr.
McComas, as the principal representatives of RSi, and Alex. Brown, as  financial
advisor   to  RSi,  and  Mr.  Crockett   and  Mr.  Faulders,  as  the  principal
representatives of  COMSAT, and  Goldman,  Sachs &  Co. ("Goldman,  Sachs"),  as
financial  advisor  to COMSAT,  and  the respective  legal  advisors to  RSi and
COMSAT, began to discuss  in greater detail the  possible terms of the  proposed
transaction.  These  possible  terms included  the  COMSAT proposal  of  a fixed
exchange ratio of 2/3 of  a share of COMSAT Common  Stock for each share of  RSi
Common Stock, and RSi's proposal of an exchange of $20 in value of COMSAT Common
Stock  for each share of RSi Common  Stock, as well as other proposed provisions
of the Merger Agreement, including  the right of the  RSi Board to consider  and
respond  to unsolicited proposals  from other persons for  the acquisition of or
other business combination  with RSi, the  terms of the  option to purchase  RSi
Common  Stock that COMSAT required in  connection with the proposed transaction,
and the terms of other related documents, with the intent of agreeing upon terms
to be  presented to  the  Board of  Directors  of each  of  RSi and  COMSAT  for
evaluation and approval. Further, Mr. Crockett and Mr. Thomas met on the evening
of  January 19,  1994 to  discuss the  matters under  negotiation. The principal
representatives of RSi and COMSAT,  and their respective financial advisors  and
legal advisors, also met on several occasions to gather and exchange information
regarding   the  management,  business,   operations,  financial  condition  and
prospects of each of the companies. As part of this exchange of information, RSi
made available to COMSAT and Goldman, Sachs the preliminary financial results of
its quarter ended December  31, 1993, which results  were publicly announced  on
January  31, 1994. The members of the  RSi Board were kept informally advised of
the discussions of the proposed terms of the transaction during this period. The
COMSAT Board received a presentation from COMSAT's management, legal counsel and
Goldman, Sachs  regarding  the  proposed  transaction  and  the  status  of  the
negotiations and due diligence on RSi on the evening of January 20, 1994.

    During  the period from  January 17 to  January 30, 1994,  Mr. Crockett, Mr.
Faulders and Steven F.  Bell, Vice President,  Human Resources and  Organization
Development  of COMSAT, and Mr. Thomas, Mr. Funston and Marvin Shoemake, a Group
Vice President of RSi, and  their respective legal advisors, discussed  COMSAT's
requirement  that Mr.  Thomas be  obligated to  remain employed  by the combined
business for a period of at least three years, COMSAT's desire to retain certain
key members of RSi management, and the terms under which Mr. Thomas and such key
employees would be retained by COMSAT. Mr. Thomas, Mr. Funston and Mr.  Shoemake
proposed  to retain substantially all of  the terms of the employment agreements
between RSi and Mr. Thomas and such key employees, but COMSAT required that such
agreements  be  modified  extensively.  For  a  description  of  the  employment
agreements with RSi and the employment agreements with COMSAT, see "-- Interests
of  Certain  Persons  in the  Merger;  Employment Agreements."  Mr.  Thomas, Mr.
Funston and  Mr. Shoemake  also discussed  with COMSAT  employment and  benefits
related  issues for all RSi  employees. See "-- Interests  of Certain Persons in
the Merger;  Employment  Agreements"  and  "-- The  Merger  Agreement  --  STOCK
OPTIONS; EMPLOYEE BENEFITS."

                                       7
<PAGE>
    On  January 24, 1994, Mr. Crockett and  Mr. Faulders met with Mr. Thomas and
Mr. Funston in the morning to review the status of the negotiations. During this
meeting they  tentatively agreed,  subject to  further consultation  with  their
respective  financial advisors and Boards of  Directors, to an exchange ratio of
2/3 of a share of COMSAT Common Stock for each share of RSi Common Stock in  the
Merger,  a termination  fee of  $5 million  plus actual  expenses of  up to $2.5
million, a provision permitting RSi, subject to certain terms and conditions, to
respond to and negotiate with other  persons that made an unsolicited offer  for
an  acquisition or other  business combination with  RSi and a  stock option for
COMSAT that would give COMSAT the right to purchase 15% of RSi Common Stock at a
price to be based on  the exchange ratio. On the  same day of this meeting,  the
trading  price for COMSAT Common Stock  declined following news reports of solar
interference causing the in-orbit failure  of two Telesat Canada satellites  and
of the launch failure of two European satellites. Throughout the week of January
24,  1994, Mr. Thomas informed the members  of the RSi Board of the negotiations
occurring between COMSAT and RSi and their respective advisors.

    On January  26, 1994,  Mr. Crockett  made a  presentation to  the RSi  Board
regarding  COMSAT's business  and operations, COMSAT's  philosophy regarding the
management of companies that it  acquired, the synergies between the  businesses
of RSi and COMSAT and Mr. Crockett's belief that the decline in the market price
of  COMSAT Common Stock earlier that week was attributable to the aforementioned
news reports. Mr. Crockett noted that the satellite and launch failures did  not
pertain  to COMSAT's assets. Mr. Crockett then left and the RSi Board considered
the proposed ratio of 2/3 of a share of COMSAT Common Stock to be exchanged  for
each  share of RSi  Common Stock in the  Merger and other  proposed terms of the
transaction. Alex.  Brown  presented to  the  RSi  Board a  description  of  the
information  that Alex. Brown had compiled and developed in order to prepare its
opinion to the RSi Board regarding the fairness, from a financial point of view,
of the  consideration  to  be paid  to  the  RSi stockholders  in  the  proposed
transaction. In light of the decrease in the market price of COMSAT Common Stock
earlier  that week, the RSi Board instructed  Mr. Thomas and Alex. Brown to seek
an exchange ratio based upon $18.75 in market value of COMSAT Common Stock  with
terms  that would give RSi stockholders some protection from further declines in
the price of  COMSAT Common  Stock. From  January 26  to January  28, 1994,  the
principal  representatives  of COMSAT  and  RSi and  their  respective financial
advisors negotiated  an exchange  ratio based  upon $18.25  in market  value  of
COMSAT  Common Stock (based  on the average  closing price of  the COMSAT Common
Stock on the NYSE Composite Tape during the 20 trading days ending five  trading
days prior to the date of the Closing) for each share of RSi Common Stock with a
provision  that no less than .638 shares of COMSAT Common Stock and no more than
.780 shares of  COMSAT Common Stock  would be  exchanged for each  share of  RSi
Common  Stock.  The  principal  representatives  of  COMSAT  and  RSi  and their
respective legal advisors also negotiated the provisions of the Merger Agreement
and of the stock option agreement (the "Stock Option Agreement") by which COMSAT
would be granted an option  to acquire up to 15%  of the outstanding RSi  Common
Stock at $18.25 per share.

    On  January 29, 1994, the COMSAT Board met to consider the Merger Agreement,
the Stock Option Agreement and the transactions contemplated thereby and,  based
upon  the  advice  of COMSAT's  management,  Goldman, Sachs  and  legal counsel,
approved them unanimously.

    On January 30, 1994, the RSi Board met to consider the Merger Agreement, the
Stock   Option   Agreement   and   the   transactions   contemplated    thereby.
Representatives  of Alex. Brown  were present at the  meeting and presented oral
and written reports regarding Alex. Brown's financial analysis of RSi and COMSAT
and its opinion  as to  the fairness,  from a financial  point of  view, of  the
consideration  to be received by RSi's stockholders in the proposed transaction.
See "-- Opinion of  RSi's Financial Advisor"  for a summary  of the written  and
oral  presentations made by Alex. Brown to the  RSi Board. The RSi Board and Mr.
Funston, Mr. McComas and  Mr. Shoemake, who were  present at the meeting,  asked
questions  of Alex. Brown during the  presentation, including whether any of the
information regarding  the  proposed  transaction reviewed  by  Alex.  Brown  in
preparing  its  analysis was  outside the  ranges  of transactions  or companies
viewed as comparable by Alex. Brown.  In response to this question, Alex.  Brown
noted that based upon the RSi stock price on the trading day four weeks prior to
the  January 30, 1994 meeting, the premium to RSi's stock price was 19.7%, which
was outside the range for other transactions Alex. Brown had reviewed,  although
the  premium to RSi's  stock price on  the trading day  immediately prior to the
January 30, 1994

                                       8
<PAGE>
meeting was 35.2%, which was within the range for such transactions. Alex. Brown
also noted that the price/ earnings multiple for the COMSAT Common Stock was  at
the  low end of the range of companies  that Alex. Brown viewed as comparable to
COMSAT. Other questions included the mechanics of the operation of the upper and
lower limits on the ratio for the exchange of COMSAT Common Stock for RSi Common
Stock in the Merger and whether a valuation of RSi based upon possible  break-up
values  would be appropriate given the nature  of RSi's business. In response to
the latter  question,  Alex. Brown  stated  that  a break-up  analysis  was  not
appropriate  given the  structure of  RSi's business.  At the  conclusion of its
presentation and the questions, Alex. Brown advised the RSi Board that in  Alex.
Brown's  opinion the consideration to be paid  to RSi stockholders in the Merger
was fair,  from  a  financial  point  of view.  The  RSi  Board  considered  the
information presented in the Alex. Brown analysis and Alex. Brown's opinion that
the  consideration  to  be  received  by  RSi's  stockholders  in  the  proposed
transaction was fair, from  a financial point  of view. The  members of the  RSi
Board  also considered the factors described under "-- Recommendation of the RSi
Board of Directors;  RSi's Reasons for  the Merger." The  RSi Board  unanimously
approved  the Merger Agreement, the Stock  Option Agreement and the transactions
contemplated thereby, and  directed that  the Merger Agreement  be submitted  to
RSi's   stockholders  for  their   approval  with  the   RSi  Board's  unanimous
recommendation that the  RSi stockholders approve  the Merger Agreement.  COMSAT
was  notified of such approval  by the RSi Board,  and the Merger Agreement, the
Stock Option Agreement and other related agreements were executed by COMSAT  and
RSi  on January  30, 1994. On  January 31, 1994,  COMSAT and RSi  issued a joint
press release stating  that they  had entered  into a  definitive agreement  for
COMSAT to acquire RSi. On January 28, 1994, the trading day immediately prior to
the  public announcement  of the  Merger, the closing  sale price  of RSi Common
Stock was $13.50. See  "COMPARATIVE PER SHARE MARKET  DATA" for a comparison  of
the consideration to be received pursuant to the Merger by holders of RSi Common
Stock  if the Merger had been consummated on January 28, 1994 and on May 2, 1994
(the most recent practicable date).

    During the week of April 11, 1994, RSi disclosed to COMSAT and its financial
advisor the preliminary financial results of RSi's quarter ended March 31, 1994.
RSi announced those results  to the public on  April 26, 1994. See  "INFORMATION
CONCERNING RSi -- Recent Developments."

    On  April  23, 1994,  the RSi  Board met  with Alex.  Brown and  RSi's legal
advisors to review the recent market performance of COMSAT Common Stock and  RSi
Common  Stock, and COMSAT's recently announced financial results for the quarter
ended  March   31,  1994.   See  "INFORMATION   CONCERNING  COMSAT   --   Recent
Developments."  The RSi Board also received a report from Mr. Funston on the RSi
financial results  for  the  quarter  ended March  31,  1994.  See  "INFORMATION
CONCERNING RSi -- Recent Developments."

    On  May 1, 1994, the RSi Board met with Alex. Brown and RSi's legal advisors
to review the recent  market performance of COMSAT  Common Stock and RSi  Common
Stock.  The RSi Board discussed the value of the consideration to be received by
RSi stockholders in the Merger based on  the current level of the trading  price
of  the COMSAT  Common Stock. The  members of  the RSi Board  noted further that
based on the closing price of COMSAT Common Stock on the NYSE Composite Tape  of
$21.25  per share on April  29, 1994, and assuming  the Conversion Fraction were
the maximum of  .780, the  value the RSi  stockholders would  receive in  COMSAT
Common  Stock for each share of RSi Common Stock would be $16.58. Although Alex.
Brown did  not reperform  the  analysis it  conducted  in January,  Alex.  Brown
advised  the RSi Board that Alex. Brown had reviewed the current market price of
the COMSAT Common Stock and of the  RSi Common Stock, the earnings releases  for
COMSAT  and RSi for the quarter ended March 31, 1994, trends in the stock market
generally and in the trading price of  the stocks of companies that Alex.  Brown
viewed as comparable to COMSAT and to RSi, and the value of the consideration to
be paid to the RSi stockholders in the Merger. Alex. Brown then confirmed to the
RSi Board that, based on a review of the foregoing information, Alex. Brown knew
of  no reason to change its opinion that the consideration to be received by RSi
stockholders in the Merger was fair, from a financial point of view. The members
of the RSi Board noted that they continued to view the business combination with
COMSAT as a  means of  furthering RSi's strategy  of developing  a full  systems
integration  capability and expanding into  international markets. The RSi Board
reconfirmed its previous determination that the terms of the Merger are fair to,
and in the best interests of,

                                       9
<PAGE>
RSi  and  the  stockholders   of  RSi.  The  RSi   Board  then  reaffirmed   its
recommendation  that RSi stockholders vote for  the approval and adoption of the
Merger Agreement and the transactions  contemplated thereby, and authorized  the
mailing of the Proxy Statement/Prospectus to RSi stockholders.

RECOMMENDATION OF THE RSI BOARD OF DIRECTORS; RSI'S REASONS FOR THE MERGER

    The  RSi Board believes that the terms of the Merger are fair to, and in the
best interests of,  RSi and its  stockholders. The RSi  Board believes that  the
procedures it employed in evaluating and approving the proposed transaction, and
determining  to  approve the  Merger  and to  recommend  the transaction  to RSi
stockholders, including (i)  seeking advice and  information from its  financial
advisor,  Alex.  Brown,  (ii)  seeking advice  and  information  from  its legal
advisors,  (iii)  monitoring  the  negotiations   of  the  Merger  and   related
transactions with COMSAT by RSi management and its advisors, and (iv) evaluating
the  information  reasonably  available to  it  were  fair to  RSi  and  the RSi
stockholders. The  RSi Board  also considered  the employment  and  compensation
arrangements  existing between  RSi and  its key  officers and  those negotiated
between COMSAT  and RSi  management  described under  "-- Interests  of  Certain
Persons  in the  Merger; Employment Agreements."  The RSi  Board unanimously has
approved the  Merger Agreement  and the  transactions contemplated  thereby  and
unanimously  recommends that the  holders of RSi Common  Stock vote FOR approval
and adoption of the Merger Agreement and the transactions contemplated thereby.

    In 1989,  RSi management  focused on  the  need to  pursue its  strategy  to
broaden  RSi's  business beyond  its traditional  core businesses.  The strategy
included developing a  full systems integration  capability (including  internal
capacity  to manufacture additional components) to supplement RSi's expertise in
manufacturing high-quality  antenna subsystems  and feed  systems for  satellite
communications,   entering  into   the  international   satellite  and  wireless
communications products  business  and  diversifying  into  sales  to  the  U.S.
government  of  commercial  off-the-shelf satellite  communications  systems. To
further this  strategy, RSi  hired  additional experienced  systems  integration
engineers and placed international marketing experts under contract with a newly
formed   RSi  international  marketing  operation.   In  1991,  in  response  to
uncertainties regarding future  levels of  U.S. government  defense budgets  and
other  possible reductions by  customers in the  traditional core businesses for
RSi's products and services and  increasing competition in RSi's product  lines,
RSi's  management decided to accelerate the  implementation of this strategy. In
1991, RSi  acquired  CSA Limited,  a  U.K.-based manufacturer  and  marketer  of
antennas,  masts  and  related  products,  and  PG  Technologies,  a  U.K.-based
designer, manufacturer and marketer of optical-electronic measuring devices  for
grinding  machines, in order to  provide visibility for RSi  in the European and
other international markets.  In 1993, RSi  acquired Anghel Laboratories,  which
designs,   manufactures   and  markets   microwave  integrated   subsystems  and
specialized  components   (including   a   converter  for   use   in   satellite
communications systems).

    After  the discussions late in 1993 and early in 1994 between Mr. Thomas and
Mr. Crockett and members  of RSi's and COMSAT's  senior managements regarding  a
possible  business  combination of  RSi and  COMSAT (see  "-- Background  of the
Merger"), the RSi Board re-evaluated RSi's progress in implementing its strategy
and evaluated whether RSi should  continue to pursue its strategy  independently
or  should pursue a business combination with COMSAT to further its strategy and
in order  to  maximize stockholder  values.  When the  discussions  between  Mr.
Crockett  and Mr. Thomas resulted in a  proposal from COMSAT that COMSAT acquire
RSi in  a merger  transaction in  which RSi  stockholders would  receive  COMSAT
Common  Stock in  exchange for  their RSi  Common Stock,  the RSi  Board further
determined that  the  proposed  acquisition  of RSi  by  COMSAT  represented  an
opportunity for RSi stockholders that should be evaluated.

    In  evaluating the COMSAT proposal, and in making its decision to enter into
and  to  recommend  approval  of  the  Merger  Agreement  and  the  transactions
contemplated thereby, the RSi Board considered the presentations made to the RSi
Board by Alex. Brown and the opinion of Alex. Brown that the consideration to be
received  by RSi stockholders in  the Merger was fair  from a financial point of
view. See

                                       10
<PAGE>
"-- Opinion of RSi's Financial  Advisor" for a summary  of the written and  oral
presentations  made by Alex.  Brown to the  RSi Board. Members  of the RSi Board
also considered a  number of  other factors, including  but not  limited to  the
following:

        1.   The future outlook for the business  of RSi and the risks and costs
    involved in realizing  future growth  and profitability if  RSi remained  an
    independent  entity, including uncertainties regarding future levels of U.S.
    government defense budgets and the expenditures of financial and  management
    resources that would be required to expand RSi's business into international
    markets.

        2.    COMSAT's  size,  international  scope  and  sophisticated  systems
    integration experience and technical expertise would further RSi's  strategy
    of  becoming  a  vertically  structured  international  systems  integration
    competitor.

        3.  COMSAT's contacts and name recognition in the international  systems
    integration  business  would help  alleviate the  difficulties that  RSi had
    experienced in  winning international  contracts  due to  its lack  of  name
    recognition among international customers.

        4.   The combination  of RSi and COMSAT  would provide greater potential
    value, in  the  long  term,  for RSi's  stockholders  than  RSi's  remaining
    independent.

        5.   RSI's  stockholders would  receive a  significant premium  over the
    recent market price of  the RSi Common  Stock, and the  terms of the  Merger
    Agreement  would provide  some protection against  a decrease  in the market
    price of COMSAT Common Stock prior to the Effective Date of the Merger.

        6.  The information available to  the RSi Board regarding the  financial
    condition,  results of  operations, earnings,  dividends, assets, management
    and business of  each of the  companies, on a  historical and a  prospective
    basis, and current industry, economic and market conditions.

        7.   The historical market  price per share of  COMSAT Common Stock, the
    historical market price per  share of RSi Common  Stock, the ratio at  which
    the  RSi Common  Stock would  be exchanged  for COMSAT  Common Stock  in the
    Merger and the premium that this would represent, and the greater  liquidity
    of the COMSAT Common Stock.

        8.   By combining with  COMSAT, RSi would have  easier access to greater
    financial resources for domestic and international expansion.

    In addition, the RSi Board took into account all the terms and conditions of
the Merger Agreement and the Stock Option  Agreement, taken as a whole. In  view
of  the variety of factors  considered in connection with  its evaluation of the
Merger, the RSi Board did not  quantify or otherwise assign relative weights  to
the individual factors considered in reaching its determinations.

    THE RSI BOARD UNANIMOUSLY RECOMMENDS THAT STOCKHOLDERS OF RSI VOTE "FOR" THE
APPROVAL  AND ADOPTION OF THE MERGER AGREEMENT AND THE TRANSACTIONS CONTEMPLATED
THEREBY.

COMSAT'S REASONS FOR THE MERGER

    The COMSAT Board believes that the Merger is in the best interests of COMSAT
and COMSAT's  shareholders. Following  the consummation  of the  Merger,  COMSAT
intends  to  combine RSi  with COMSAT's  existing systems  integration business,
COMSAT Technology Services  ("CTS"). CTS is  currently primarily an  engineering
operation,  and purchases  all of  its hardware  from third  party vendors, thus
increasing its cost and rendering it frequently unable to compete on price  with
vertically  integrated  firms.  COMSAT also  has  concluded that  CTS  lacks the
critical mass of business  needed to spread the  costs of maintaining  technical
excellence  over enough  projects to  remain price  competitive. COMSAT believes
that combining CTS with RSi  will allow COMSAT to  reduce its cost of  obtaining
hardware  and improve both its systems  engineering and its products through the
coordination and technical feedback created  by having the systems engineers  of
CTS  and  RSi  and the  hardware  developers  and manufacturers  of  RSi working
together, supported  by  the scientists  of  COMSAT Laboratories.  In  addition,
COMSAT believes that the combination of COMSAT's strong international reputation
for  technical expertise  and RSi's full  line of  hardware products, management
skills and low-cost manufacturing operations will create an entity that will  be
an  effective  U.S.  competitor in  the  international  satellite communications
business.

                                       11
<PAGE>
OPINION OF RSI'S FINANCIAL ADVISOR

    In connection with the Merger, RSi retained Alex. Brown on January 15, 1994,
to act as RSi's financial advisor and to render its opinion as to the  fairness,
from  a financial point of view, of the consideration to be received pursuant to
the Merger by holders of RSi Common Stock (the "Consideration"). At the  January
30,  1994  meeting of  the  RSi Board,  at which  the  Merger Agreement  and the
transactions contemplated thereby were  approved by the  RSi Board, Alex.  Brown
rendered  to  the RSi  Board its  oral  opinion regarding  the fairness,  from a
financial point of view, of the Consideration  and delivered to the RSi Board  a
written opinion, dated January 30, 1994, confirming the oral opinion.

    The full text of Alex. Brown's written opinion dated January 30, 1994, which
includes   the  assumptions  made,  general   procedures  followed  and  matters
considered by Alex. Brown, is attached hereto as Exhibit C. Such written opinion
does not differ  in any material  respect from the  opinion presented orally  by
Alex.  Brown to the  RSi Board. STOCKHOLDERS SHOULD  READ CAREFULLY THE ATTACHED
ALEX. BROWN WRITTEN OPINION  AND THE DISCUSSION SET  FORTH HEREIN FOR THE  SCOPE
AND  LIMITATIONS OF ALEX. BROWN'S REVIEW. ALEX. BROWN'S OPINION IS DIRECTED ONLY
TO THE FAIRNESS, FROM A FINANCIAL POINT OF VIEW, OF THE CONSIDERATION PAYABLE TO
STOCKHOLDERS OF  RSI  UNDER THE  MERGER  AGREEMENT  AND DOES  NOT  CONSTITUTE  A
RECOMMENDATION  TO ANY RSI STOCKHOLDER AS TO HOW SUCH STOCKHOLDER SHOULD VOTE AT
THE SPECIAL MEETING.

    In connection  with  its  opinion, Alex.  Brown  reviewed  certain  publicly
available  financial  information concerning  RSi and  COMSAT. Alex.  Brown held
discussions with  members  of  the  senior managements  of  RSi  and  of  COMSAT
regarding the businesses and prospects of each company. In addition, Alex. Brown
(i)  reviewed the historical reported prices and trading activity for the common
stock of RSi and of COMSAT, (ii) compared certain financial information for both
RSi and COMSAT with similar  information for certain comparable companies  whose
securities  are publicly traded, (iii) compared certain stock market information
and valuations for both RSi and  COMSAT with similar information for  comparable
companies  whose  securities are  publicly traded,  (iv) reviewed  the financial
terms  of  certain  recent  business  combinations  which  Alex.  Brown   deemed
comparable  to the  Merger in whole  or in part,  (v) reviewed the  terms of the
Merger Agreement and the Stock  Option Agreement and certain related  documents,
and  (vi) performed  such other studies  and analyses and  considered such other
factors as Alex. Brown deemed appropriate.

    As discussed in its  opinion, Alex. Brown did  not independently verify  the
information  reviewed by it, and,  for the purposes of  its opinion, assumed and
relied upon the accuracy and  completeness thereof. With respect to  information
relating  to the  prospects of  RSi and  COMSAT, Alex.  Brown assumed  that such
information reflected the  best currently available  judgments and estimates  of
the  managements  of  RSi  and  of COMSAT  as  to  the  likely  future financial
performance of their respective companies, and that such judgments and estimates
(and the assumptions and  bases therefor) were reasonable.  Alex. Brown did  not
make  nor was  it provided  with an independent  evaluation or  appraisal of the
assets of RSi or of COMSAT. Alex.  Brown's opinion is based on market,  economic
and  other considerations as they existed and  could be evaluated as of the date
of its written opinion.

    In delivering  its  opinion to  the  RSi  Board, Alex.  Brown  prepared  and
delivered  certain written  materials. Such written  materials contained various
valuation analyses as well as other information regarding RSi, COMSAT and  other
comparative  data and analyses  Alex. Brown deemed relevant  to its opinion. The
RSi internal estimates used  by Alex. Brown in  connection with its analyses  of
the  transaction and in rendering its written and oral opinions, and included in
the written materials prepared by Alex. Brown for the RSi Board, were based upon
the assumption that an accrual of recoveries for business interruption insurance
for tornado damage sustained at RSi's Largo, Florida facility in October 1992 in
the amount of $800,000 would be included in RSi's revenues, and therefore in its
operating income and, after the effect of taxes, its net income, for the quarter
ended December 31, 1993. Subsequent to the preparation of Alex. Brown's analyses
and the written materials for the RSi Board, RSi concluded that such an  accrual
was  not appropriate for that quarter. As  a result, the information referred to
below that was based upon or  includes such RSi internal estimates is  presented
solely  to describe the analyses performed by  Alex. Brown and provided by Alex.
Brown to the RSi Board.

                                       12
<PAGE>
    Because the business interruption insurance proceeds were not accrued in the
quarter ended December 31, 1993, the  information in the RSi internal  estimates
for  the quarter ended December 31, 1993 and the six-month period ended December
31, 1993  differs from  RSi's publicly  reported results  for such  periods  and
therefore  should not be relied upon for any purpose other than evaluating Alex.
Brown's analyses. The  effect of the  absence of such  accrual on Alex.  Brown's
analyses  was discussed at  the January 30,  1994 meeting of  the RSi Board, and
Alex. Brown advised the RSi Board at the meeting that the absence of an  accrual
for  or the deferral of recognition  of such business interruption insurance was
not deemed  to be  material by  Alex. Brown  and did  not affect  Alex.  Brown's
ability to issue its opinion as to the fairness, from a financial point of view,
of the Consideration.

    The  following  is a  summary of  Alex. Brown's  written materials  and oral
comments delivered to the RSi Board on January 30, 1994 concerning the  proposed
Merger:

    RSI  HISTORICAL  AND  PROJECTED  INCOME  STATEMENTS.    In  reviewing  RSi's
historical income  statements, Alex.  Brown noted  that during  the fiscal  year
ended June 30, 1993, RSi experienced a decline in revenues, operating income and
net income of 4.2%, 6.6% and 3.3%, respectively, from the prior fiscal year. RSi
management  had provided to Alex. Brown RSi's internal estimates for its results
of operations for  the balance of  fiscal year  1994 and for  fiscal year  1995.
Based  on RSi's internal estimates  for the six months  ended December 31, 1993,
RSi experienced a decline in revenues and net income of 14.3% and 11.8% compared
to the same period in  1992. Alex. Brown noted that  for the fiscal year  ending
June  30, 1994, RSi expected a growth in  revenues of 3.3% compared to the prior
fiscal year, but expected  further declines in operating  income and net  income
for  the  period when  compared with  the prior  fiscal year  of 6.2%  and 9.4%,
respectively.

    As a  result  of  the recent  and  expected  decline in  its  earnings,  RSi
estimated  a decline in earnings per share of approximately 8.9% for fiscal year
1994 compared  to  fiscal year  1993.  Alex.  Brown noted  that  RSi's  internal
earnings  per share estimates for the fiscal years ending June 30, 1994 and June
30, 1995  were  below  the  earnings  estimates for  RSi  as  published  by  the
Institutional Brokers Estimating System ("IBES"). These IBES estimates are based
on earnings estimates by Merrill Lynch Pierce Fenner & Smith, which was the only
broker that provided earnings estimates on RSi for publication in IBES as of the
date of the Merger Agreement. Alex. Brown noted that disclosure to the market of
the  December 1993 earnings  results, and financial  performance consistent with
the RSi internal estimate  for the balance  of fiscal year  1994 and for  fiscal
year 1995, could have a negative effect on the trading price of RSi Common Stock
over  such periods.  Alex. Brown  noted in  this respect  that the Consideration
represented a premium to RSi's Common Stock  price as of the date of the  Merger
Agreement of 35.2%.

    STOCK  PRICE ANALYSIS.  Alex. Brown reviewed and analyzed the performance of
the per share market prices  and trading volume of  RSi Common Stock and  COMSAT
Common Stock over the period from January 29, 1993 through January 27, 1994 (the
"Comparison  Period") both separately and in relation to each other. Alex. Brown
also compared the daily closing  prices of the common  stocks of RSi and  COMSAT
with  the Standard & Poor's  industrial average for 500  stocks (the "Standard &
Poor's 500 Index"),  the NASDAQ  Index and a  composite index  of certain  other
publicly  traded  telecommunications companies  that  Alex. Brown  deemed  to be
substantially comparable to  RSi and COMSAT  (respectively, the "RSi  Comparable
Companies" and the "COMSAT Comparable Companies") during the Comparison Period.

    Alex.  Brown noted that  for substantially all of  the Comparison Period the
RSi Common Stock had not performed as  well as the Standard & Poor's 500  Index,
the NASDAQ Index or the index of RSi Comparable Companies. Alex. Brown commented
that  this performance could  be attributed in  part to RSi's  slowing growth in
revenues, operating income and earnings per share as well as its actual  decline
for  the most recently reported twelve  months in revenues, operating income and
earnings per  share. Alex.  Brown noted  that  in view  of RSi's  December  1993
quarterly  financial results that had not then been made publicly available, and
the projected financial performance for the balance of fiscal year 1994 and  for
fiscal  year 1995, RSi's stock price may continue to perform at levels below the
three  indices  discussed  above.  Conversely,  for  substantially  all  of  the
Comparison  Period, COMSAT Common Stock performed as  well as or better than the
Standard & Poor's 500 Index, the NASDAQ Index and the index of COMSAT Comparable
Companies.

                                       13
<PAGE>
Alex. Brown noted  that over  the most  recent five-year  period, COMSAT  Common
Stock  has generally performed as  well as or better  than the Standard & Poor's
500 Index, the NASDAQ Index and the index of COMSAT Comparable Companies.

    Alex. Brown commented  that the trading  volume of COMSAT  Common Stock  was
substantially greater than that of RSi Common Stock and, therefore, ownership of
COMSAT  Common Stock would provide greater liquidity. Additionally, the dividend
yield of 2.8% paid on COMSAT Common Stock was greater than the dividend yield of
0.8% for RSi Common Stock. Alex. Brown commented that the recent performance  of
RSi  Common  Stock when  compared with  the three  indices described  above, the
recent and long-term performance  of COMSAT Common Stock  at levels at or  above
the  three indices described above and the  greater dividend yield to holders of
COMSAT Common  Stock were  all factors  to be  considered by  the RSi  Board  in
evaluating   the  Consideration.   Lastly,  Alex.   Brown  commented   that  the
Consideration represented a premium to RSi's  Common Stock price as of the  date
of  the Merger Agreement of 35.2%. Further,  Alex. Brown noted that the price of
$18.25 of COMSAT Common Stock for each share  of RSi Common Stock is at a  level
at  which RSi's Common  Stock has not  traded since February  1989, except for a
brief three-week period  in January and  February 1992 when  RSi's revenues  and
earnings were growing at a substantially faster rate.

    ANALYSIS  OF CERTAIN OTHER PUBLICLY TRADED  COMPANIES.  Alex. Brown compared
certain financial information relating to  RSi to corresponding data and  ratios
from  the  RSi  Comparable  Companies. Such  information  included,  among other
things, (i) equity market valuation  ("Equity Market Value"), (ii) market  value
adjusted  for debt and cash ("Adjusted  Market Value"), (iii) growth rates, (iv)
operating performance,  (v) ratios  of  Adjusted Market  Value to  revenues  and
operating  income,  each for  the latest  twelve-month period  ("Trailing Twelve
Months") as derived from publicly  available information; (vi) ratios of  Equity
Market  Value per share to earnings per  share for the Trailing Twelve Months as
derived from publicly available information and to estimated earnings per  share
for calendar years 1993 and 1994 as reported by the IBES; and (vii) book value.

    Alex.  Brown noted  that, on  a Trailing Twelve  Months basis,  the range of
multiples of Adjusted Market Value to  revenues of the RSi Comparable  Companies
is  0.3 to  1.8 with a  mean of 1.1.  RSi's multiple  based on the  value of the
Consideration is 1.3  and, therefore, is  within this range.  Alex. Brown  noted
that,  on  a  Trailing  Twelve  Months basis  for  each  of  the  RSi Comparable
Companies, the range of multiples of  Equity Market Value to earnings per  share
of  the RSi  Comparable Companies  is 11.3 to  47.9 with  a mean  of 23.2. RSi's
multiple based on  the value  of the Consideration  is 15.0  and, therefore,  is
within  this range. Alex. Brown noted that the RSi Comparable Companies trade at
a range of multiples of Equity Market Value to estimated earnings per share  for
calendar years 1993 and 1994 of 11.3 to 34.9 and 4.7 to 24.2, respectively, with
means of 20.0 and 16.5, respectively. RSi's multiples for the same periods based
on  the value of the Consideration are  15.7 and 14.5 and, therefore, are within
the respective ranges. Alex. Brown noted that while RSi's Trailing Twelve  Month
and  projected calendar years  1993 and 1994  earnings multiples were relatively
low in  the range  of RSi  Comparable  Companies, the  recent decline  in  RSi's
earnings  and the projected continued earnings  decline through fiscal year 1994
justified the multiples being below the mean of RSi Comparable Companies.  Alex.
Brown  also noted  that the range  of multiples  of Equity Market  Value to book
value of the RSi Comparable Companies at September 30, 1993 is 0.6 to 3.6 with a
mean of 2.1. RSi's multiple as of September  30, 1993 based on the value of  the
Consideration is 1.7 and, therefore, is within this range.

    ANALYSIS  OF  SELECTED COMPARABLE  TRANSACTIONS.   Alex. Brown  reviewed the
financial terms of 22 selected  acquisitions in the telecommunications  industry
considered  by Alex. Brown to be transactions comparable to the Merger. Of these
22, six were mergers or acquisitions of public companies. Alex. Brown noted that
the 22 transactions were effected at a range of multiples of "Adjusted  Purchase
Price" (purchase price per share times the number of shares outstanding ("Equity
Purchase  Price")  plus long-term  debt less  cash and  cash equivalents  of the
acquired entity) to revenues of 0.1 to 6.7  with a mean of 1.5. The multiple  of
Adjusted  Purchase Price to  revenues for the  Merger is 1.3  and, therefore, is
within this range. These transactions also were effected at a range of multiples
of Adjusted Purchase Price  to operating income  of 6.1 to 32.5  with a mean  of
11.7. The multiple of Adjusted Purchase Price to operating income for the Merger
is 10.7 and,

                                       14
<PAGE>
therefore,  is within this  range. The 22  transactions also were  effected at a
range of multiples of Equity Purchase Price to net income of 10.1 to 41.1 with a
mean of 22.1. The multiple of Equity Purchase Price to net income for the Merger
is 15.7 and, therefore, is within this range.

    Additionally, the six transactions involving public companies were  effected
at  a range of premiums to the target's  share price on the trading day prior to
announcement of the  transaction of -5.5%  to 42.4%  with a mean  of 19.0%.  The
premium  to RSi's share  price on the  trading day prior  to announcement of the
Merger is  35.2% and,  therefore,  is within  the  range. The  six  transactions
involving  public companies were effected at a range of premiums to the target's
share price four weeks prior to announcement  of 25.4% to 100.0% with a mean  of
44.4%.  The premium to RSi's share price four weeks prior to announcement of the
Merger is 19.7% and, therefore, is outside of this range. Alex. Brown commented,
however, that the Consideration provided a significant premium to the RSi  stock
price four weeks prior to announcement of the Merger, and the premium to the RSi
stock  on the  trading day prior  to the announcement  of the Merger  was a more
accurate measure of the premium to market for the Merger.

    Alex. Brown also reviewed seven  transactions involving public companies  in
the  technology-related industry that were treated as a pooling of interests for
accounting purposes. These transactions were effected at a range of premiums  to
the  target's  share price  on  the trading  day  prior to  announcement  of the
transaction of -5.5% to 57.4% with a  mean of 37.3%. The premium to RSi's  share
price  on the  trading day  prior to  announcement of  the Merger  is 35.2% and,
therefore, is within this range. Additionally, these transactions were  effected
at a range of premiums to the target's average share price for the 30 days prior
to  announcement of the transaction of 26.9% to  70.8% with a mean of 51.0%. The
premium to RSi's average share  price for the 30  days prior to announcement  of
the  Merger is 26.5% and, therefore, is slightly outside this range. Alex. Brown
commented, however, that the Merger Consideration provided a significant premium
to the average price of RSi stock for  the 30 days prior to announcement of  the
Merger,  and the premium to  RSi stock on the  trading day prior to announcement
was a more accurate measure of the premium to market for the Merger.

    PRO FORMA  CONTRIBUTION  ANALYSIS.    Alex. Brown  analyzed  the  pro  forma
contribution  of RSi  to the  projected operating income  and net  income of the
combined entity  for  COMSAT's fiscal  years  ended December  31,  1993  through
December  31,  1995,  and  compared  these percentages  to  the  percent  of the
outstanding stock of  the combined  entity that RSi  stockholders would  receive
upon  consummation of the Merger  when effected at a  range of trading prices of
COMSAT Common Stock. Depending on the Conversion Fraction, upon consummation  of
the Merger, RSi stockholders would receive COMSAT Common Stock equal to 11.6% to
13.8%  of the outstanding common  stock of the combined  entity. With respect to
COMSAT's fiscal year ended  December 31, 1993, it  was estimated that RSi  would
have  contributed approximately 9.2%  of the combined  entity's operating income
and  11.2%  of  its  net  income.  In  addition,  RSi  would  have   contributed
approximately  11.3% of the  combined entity's book value  at December 31, 1993.
Since RSi stockholders would receive 11.6% to 13.8% of the outstanding stock  of
the  combined  entity  in  the  Merger,  Alex.  Brown  commented  that  the  RSi
stockholders' share  of the  combined entity  would be  commensurate with  RSi's
contribution to the combined entity's results of operations and book value.

    COMSAT  HISTORICAL  INCOME  STATEMENTS.   In  reviewing  COMSAT's historical
income statements, Alex. Brown noted that COMSAT experienced growth in  revenues
in each fiscal year over the period from the fiscal year ended December 31, 1988
through the fiscal year ended December 31, 1992. Alex. Brown noted that although
COMSAT  experienced declines in  operating income and net  income for the fiscal
years ended December 31, 1990 and December  31, 1992, such declines were due  to
restructuring  charges during those periods. For the nine months ended September
30, 1993, COMSAT  experienced a  growth in  revenues, operating  income and  net
income   of  approximately  16.2%,  15.6%  and  10.5%,  respectively,  over  the
comparable period in the prior year when restructuring charges are excluded from
such  prior  period.  COMSAT  management  provided  Alex.  Brown  with  internal
estimates as part of Alex. Brown's due diligence, including the information that
COMSAT's  earnings per share for calendar year  1993 were estimated to be within
the range of estimates published by IBES of $1.79 to $1.95.

                                       15
<PAGE>
    The above summary of the written materials submitted and oral  presentations
made  by  Alex. Brown  does  not purport  to be  a  complete description  of its
presentation to the RSi Board,  nor does this summary  purport to be a  complete
description of the analyses performed by Alex. Brown in arriving at its opinion.
The  preparation of a fairness  opinion involves a determination  as to the most
appropriate and relevant methods  of financial analysis  and the application  of
these methods to the particular circumstances and, therefore, such an opinion is
not  readily susceptible to partial analysis or summary description. Alex. Brown
believes that its analyses and the summary set forth above must be considered as
a whole and that  selecting only portions of  its analyses, without  considering
all  factors, or  only portions  of the  above summary,  without considering all
factors and analyses, could create an incomplete view of the process  underlying
the  analyses set forth in the written materials submitted by Alex. Brown and in
the  opinion.  The  analyses  performed  by  Alex.  Brown  are  not  necessarily
indicative  of actual values or future  results, which may be significantly more
or less favorable than those suggested by such analyses. Additionally,  analyses
relating  to the  value of  a business  do not  purport to  be appraisals  or to
reflect the prices  at which  the business  may actually  be sold.  Furthermore,
Alex.  Brown expresses no  opinion as to  the prices at  which the COMSAT Common
Stock to  be received  by  RSi stockholders  in the  Merger  may trade,  or  the
liquidity of such stock, at any future time.

    REASONS  FOR SELECTION  OF ALEX.  BROWN.   RSi selected  Alex. Brown  as its
financial advisor on  the basis  of Alex.  Brown's experience  and expertise  in
transactions  similar  to  the  Merger,  familiarity  with  the  technology  and
telecommunications industries and commitment  to make specific senior  personnel
available  for the  transaction, and following  discussions by  RSi with another
investment banker. Alex. Brown is  a nationally recognized investment bank  that
is  regularly involved  in the valuation  of businesses and  their securities in
connection with mergers and acquisitions.

    ALEX. BROWN COMPENSATION.  Pursuant to a letter agreement dated January  15,
1994  (the "Engagement Letter"),  RSi engaged Alex.  Brown to provide investment
banking advice and services to RSi in connection with RSi's review and  analysis
of  a  potential business  combination with  COMSAT. See  "-- Background  of the
Merger." RSi agreed to pay Alex. Brown a retainer fee of $25,000 upon  execution
of  the Engagement Letter and a fee of $300,000 at the time of delivery of Alex.
Brown's opinion as  to the  fairness, from  a financial  point of  view, of  the
consideration  payable to  RSi's stockholders  in the  Merger. In  addition, the
Engagement Letter provides that  upon consummation of the  Merger, RSi will  pay
Alex.  Brown an additional fee  of $675,000, for a  total of $1,000,000 in fees.
RSi has  also  agreed to  reimburse  Alex. Brown  for  reasonable  out-of-pocket
expenses,  including fees and disbursements of  counsel, incurred by Alex. Brown
in carrying out its duties under  the Engagement Letter, and to indemnify  Alex.
Brown for certain liabilities in connection with its engagement.

SHAREHOLDER LITIGATION

    In early February 1994, two purported class action lawsuits on behalf of RSi
stockholders  were  filed in  Clark County  state court  in Nevada  (the "Nevada
Lawsuits"). The Nevada Lawsuits seek injunctive relief, including enjoining  the
Merger  and the transactions contemplated by  the Merger Agreement and the Stock
Option Agreement, and damages. The complaints  in the Nevada Lawsuits name  RSi,
the  members of the RSi Board, and  COMSAT as defendants. The complaints allege,
among other  things, that  the RSi  Board  breached its  fiduciary duty  to  RSi
stockholders in approving the Merger Agreement and Stock Option Agreement and in
recommending  the Merger  to the  RSi stockholders,  and in  failing to  seek an
auction for RSi, and that the consideration  to be paid in the Merger is  unfair
and  inadequate. RSi, the members of the  RSi Board and COMSAT intend to contest
the Nevada Lawsuits vigorously. A condition to COMSAT's obligation to consummate
the Merger  is the  absence of  any lawsuit  challenging the  Merger. Given  the
status  of the  Nevada Lawsuits as  of the  date hereof, it  is COMSAT's present
intention to waive this condition with  respect to the Nevada Lawsuits.  Neither
COMSAT  nor RSi  will be  obligated to  consummate the  Merger under  the Merger
Agreement if a judicial  order enjoining the  Merger is in  effect. See "--  The
Merger Agreement -- CONDITIONS TO THE MERGER."

                                       16
<PAGE>
INTERESTS OF CERTAIN PERSONS IN THE MERGER; EMPLOYMENT AGREEMENTS

    In  considering  the recommendation  of the  RSi Board  with respect  to the
Merger Agreement  and the  transactions contemplated  thereby, RSi  stockholders
should  be aware that certain members of RSi's management and the RSi Board have
certain interests  in  the Merger  that  are in  addition  to the  interests  of
stockholders  of RSi generally. The  RSi Board was aware  of these interests and
considered them  in evaluating  whether  to approve  and  recommend to  the  RSi
stockholders the Merger Agreement and the transactions contemplated thereby.

    Following   the  Effective  Date,   COMSAT's  existing  systems  integration
division, CTS, will  be combined with  the business  of RSi to  form COMSAT  RSI
("COMSAT  RSI"). Following the Effective Date,  Richard E. Thomas, currently the
Chairman, Chief Executive Officer and President of RSi, will become President of
COMSAT RSI and  an officer  of COMSAT,  and Mark  D. Funston,  R. Doss  McComas,
Marvin  D. Shoemake, Anita M. Stutzman and  William A. Thomas, who are currently
officers of RSi  (the "Five  Officers"), each will  become a  Vice President  of
COMSAT RSI.

    Richard  E.  Thomas and  each of  the Five  Officers currently  have written
employment agreements with RSi (the  "RSi Employment Agreements"). Mr.  Thomas's
RSi  Employment  Agreement  originated in  1982  and provided  for  a continuing
five-year term. Mr. Thomas's RSi  Employment Agreement was amended and  restated
in  1987. The 1987  RSi Employment Agreement  with Mr. Thomas  provided that Mr.
Thomas could  retire  to the  post  of "Chairman  Emeritus"  at any  time  after
attaining  age  60,  upon  six  months'  written  notice  to  RSi.  As "Chairman
Emeritus," Mr. Thomas was to receive his full salary for 12 months, followed  by
50% of his salary for 48 months. The 1987 RSi Employment Agreement also provided
for  a termination allowance  equal to 58  months' salary if  RSi terminated Mr.
Thomas's employment for any reason other than incapacity. This amount was to  be
paid  in a lump sum if Mr. Thomas's  employment was terminated in the event of a
hostile change in control. On  August 27, 1992, the  RSi Board agreed to  extend
the  retirement benefit period for Mr. Thomas by an additional five years at 50%
of full salary.

    Mr. Thomas's RSi Employment Agreement was modified on November 20, 1993. The
1993 RSi Employment Agreement provides for a three-year term to end on  November
20, 1996. The 1993 RSi Employment Agreement incorporates the extended retirement
benefits  approved on August  27, 1992 and provides  for a termination allowance
for 120 months, with the first 60 months at full salary and the second 60 months
at 50% of salary.  The 1993 RSi Employment  Agreement provides that this  amount
would  be paid in a  lump sum in the  event of a change  of control, even if Mr.
Thomas did not terminate his employment.

    The RSi Employment Agreements with the Five Officers provide for  continuing
one-year  terms. Prior to November 20,  1993, the RSi Employment Agreements with
the Five  Officers  each provided  for  a  termination allowance  for  the  Five
Officers  equal to 10 months'  salary if their employment  was terminated by RSi
for a reason other than the employee's  incapacity to perform his or her  duties
or  RSi's decision to wind  up its business. The  RSi Employment Agreements with
the Five Officers were amended on November 20, 1993 to increase the  termination
allowance to 22 months' salary and to provide among other things that (i) upon a
change  in control  of RSi  all outstanding stock  options held  by such persons
would become immediately exercisable  60 days before the  effective date of  the
change  in control  and (ii) if  the employee  voluntarily terminated employment
with RSi within  one year  following a change  in control  or was  involuntarily
terminated  by  RSi  within  two  years  following  a  change  in  control,  the
termination allowance would be paid in a lump sum.

    The RSi Employment Agreements  with Richard E. Thomas  and each of the  Five
Officers will terminate, and be superseded by employment agreements with COMSAT,
as  described below, as of the Effective  Date. The Five Officers have agreed to
waive  the  change-in-control  provisions  of  the  RSi  Employment   Agreements
described   above.  The  change-in-control  provisions  of  the  RSi  Employment
Agreements of Mr. Thomas and the Five Officers will not become effective.

    COMSAT has entered into employment agreements with Richard E. Thomas and the
Five Officers which  will become effective  on the Effective  Date. Pursuant  to
COMSAT's  agreement with  Mr. Thomas,  which RSi  was required  to use  its best
efforts  to  cause   Mr.  Thomas  to   execute  as  a   condition  to   COMSAT's

                                       17
<PAGE>
obligation  to consummate the Merger, Mr. Thomas will become President of COMSAT
RSI and is guaranteed employment for three years unless COMSAT (i) substantially
reduces his responsibilities,  in which case  he can leave  voluntarily upon  60
days'  notice, or  (ii) determines  he should be  removed for  cause. "Cause" is
defined in the agreement to mean (i)  a continued and deliberate failure by  Mr.
Thomas  to  perform his  duties in  a manner  substantially consistent  with the
manner prescribed by the COMSAT Board or the President of COMSAT (other than any
such failure resulting from physical or mental illness), which failure continues
for 10 days following receipt of written notice thereof from the COMSAT Board or
COMSAT's President, (ii) serious misconduct that is materially and  demonstrably
injurious  to COMSAT or its reputation, (iii) a conviction of a felony involving
a crime  of  moral  turpitude,  or  (iv) disability  or  death.  If  Mr.  Thomas
terminates the agreement voluntarily upon a reduction of his responsibilities as
described  above, he must be paid in a lump sum (i) his then current base salary
through the remainder of the employment period  and (ii) an amount equal to  his
last  bonus under  COMSAT's Annual  Incentive Plan  multiplied by  the number of
January months remaining in the  employment period. The agreement provides  that
Mr.  Thomas  will receive  a minimum  annual  salary of  $315,000 (which  is his
current salary with RSi),  subject to annual  review for merit-based  increases,
and  guarantees him a minimum bonus of $100,000 in January 1995. Thereafter, Mr.
Thomas  will  be  eligible  to  receive  bonuses  based  upon  his  satisfactory
performance  of goals  to be agreed  to in writing  by him and  the President of
COMSAT. The Agreement also provides that Mr. Thomas, like other COMSAT executive
officers, may defer up  to 25% of his  base salary and up  to 100% of his  bonus
under  the  COMSAT  Directors  and Executives  Deferred  Compensation  Plan. The
agreement provides  further  that  Mr.  Thomas  shall  be  entitled  to  receive
retention  bonuses so  long as he  remains employed  by COMSAT on  the date such
bonuses are  payable,  as follows:  (i)  90 days  after  the Effective  Date,  a
retention bonus of $50,000; (ii) on the first anniversary of the Effective Date,
a  retention bonus of $50,000; (iii) on  the second anniversary of the Effective
Date, a retention bonus  of $50,000; and  (iv) on the  third anniversary of  the
Effective Date, a retention bonus of $100,000.

    The agreement with Richard E. Thomas also provides for Mr. Thomas to receive
fringe  benefits generally  made available  by COMSAT  to its  senior management
group, such as participation  in the COMSAT Split  Dollar Insurance Plan  (which
will  provide Mr. Thomas an  initial death benefit of  $945,000, to be increased
5.5% annually each January  during the employment  period under the  agreement),
the  COMSAT 1990 Key Employee Stock Plan  (the "COMSAT Option Plan"), the COMSAT
Employee  Stock  Purchase  Plan,  the  COMSAT  Dividend  Reinvestment  Plan  and
financial  counseling and  planning services. In  addition, Mr.  Thomas shall be
entitled to immediate  participation in COMSAT's  Insurance and Retirement  Plan
for  Executives (the "COMSAT  SERP"), and shall  be deemed fully  vested in such
plan on the Effective Date. Upon Mr. Thomas's retirement from COMSAT, the COMSAT
SERP will  provide Mr.  Thomas with  an annuity  for life  equal to  60% of  his
average  annual compensation (salary and compensation under the Annual Incentive
Plan) during the  48 consecutive  months (or  shorter period  of employment,  as
applicable)  of  highest  compensation,  offset  by  certain  other  pension and
retirement benefits.  Further, Mr.  Thomas  shall be  provided  with a  car  for
business  and personal use consistent with  his auto benefit previously provided
by RSi, and, in the event of termination, COMSAT has agreed to transfer title of
the car to Mr. Thomas at  COMSAT's expense. The agreement provides further  that
Mr.  Thomas shall be granted options to  purchase 80,000 shares of COMSAT Common
Stock  and  18,500  Restricted  Stock  Awards  under  the  COMSAT  Option  Plan.
Consistent  with the  terms of  options and  Restricted Stock  Awards awarded to
other COMSAT employees under the COMSAT Option Plan, such options shall vest 25%
one year after the Effective  Date, 25% two years  after the Effective Date  and
50%  three years after  the Effective Date  and shall expire  10 years after the
Effective Date, and such Restricted Stock Awards will contain vesting provisions
based on objective performance standards adopted  by the COMSAT Board and to  be
approved by the COMSAT shareholders.

    Under  their employment agreements, each of the Five Officers are guaranteed
employment for three years unless COMSAT (i) should substantially reduce his  or
her  responsibilities as a Vice President of COMSAT  RSI in which case he or she
can leave voluntarily upon 60 days' notice  to COMSAT, or (ii) determines he  or
she  should be removed for "cause,"  which is defined in the  same way as in Mr.
Thomas's agreement. If the  former occurs, each of  the agreements provide  that
the  Officer must be paid in a lump sum  his or her then current base salary for
one year. Each of the Five Officers will  receive a base salary equal to his  or
her  RSi  salary  plus  $10,000  in  lieu  of  certain  reimbursement allowances
previously

                                       18
<PAGE>
provided to such officers by RSi.  The agreements provide that, consistent  with
COMSAT's  general practice  for persons in  similar positions, each  of the Five
Officers shall be  eligible to receive  annual bonuses under  the COMSAT  Annual
Incentive  Plan based upon  performance and shall be  entitled to participate in
COMSAT RSI's  group life  insurance plan,  the COMSAT  Option Plan,  the  COMSAT
Employee  Stock Purchase  Plan and  the COMSAT  Dividend Reinvestment  Plan. The
agreements provide further that COMSAT RSI will pay the "employee's portion"  of
each of the Five Officers' life, health and disability insurance coverage during
the  term  of  their employment  under  the  employment agreements.  All  of the
agreements other  than Ms.  Stutzman's  also provide  for retention  bonuses  as
follows:  (i) 90 days  after the Effective  Date, a retention  bonus of $25,000;
(ii) on  the first  anniversary of  the  Effective Date,  a retention  bonus  of
$27,000;  (iii) on  the second  anniversary of  the Effective  Date, a retention
bonus of $29,000; and  (iv) on the  third anniversary of  the Effective Date,  a
retention  bonus  of $31,500.  Ms. Stutzman's  agreement provides  for retention
bonuses as follows: (i) 90 days after  the Effective Date, a retention bonus  of
$16,000;  (ii) on the first anniversary of the Effective Date, a retention bonus
of $17,300; (iii) on the second  anniversary of the Effective Date, a  retention
bonus  of $18,600; and  (iv) on the  third anniversary of  the Effective Date, a
retention bonus of $20,200.

    The agreements  with each  of  the Five  Officers  other than  Ms.  Stutzman
further  provide that each of such persons  shall be granted options to purchase
7,000 shares of COMSAT Common Stock and 5,000 Restricted Stock Awards under  the
COMSAT  Option Plan.  Ms. Stutzman's agreement  provides that  she shall receive
options to purchase  4,500 shares of  COMSAT Common Stock  and 3,200  Restricted
Stock  Awards under the COMSAT Option Plan. Consistent with the terms of options
and Restricted Stock Awards awarded to  other COMSAT employees under the  COMSAT
Option  Plan, such options shall vest 25% one year after the Effective Date, 25%
two years after the Effective Date and 50% three years after the Effective  Date
and  shall expire 10 years  after the Effective Date,  and such Restricted Stock
Awards will contain vesting provisions based on objective performance  standards
adopted by the COMSAT Board and to be approved by the COMSAT shareholders.

    Consistent  with  the treatment  of all  unexpired  options to  purchase RSi
Common Stock, RSi stock  options held by  the Five Officers  will be assumed  by
COMSAT  on  the Effective  Date and  converted into  options to  purchase COMSAT
Common Stock based on  the Conversion Fraction. Richard  E. Thomas holds no  RSi
stock  options.  See  "--  The  Merger  Agreement  --  STOCK  OPTIONS;  EMPLOYEE
BENEFITS."

    Concurrently with entering into the Merger Agreement, COMSAT agreed to enter
into a contract with each director of RSi (other than Richard E. Thomas and, for
the reason  described  below,  Calhoun  J.  Killeen)  to  provide  the  benefits
specified in the "Board of Directors Retirement/Service Compensation" program of
RSi  or the present value of such benefits determined using an interest rate not
to  exceed  eight  percent  per  year.   Under  the  RSi  "Board  of   Directors
Retirement/Service Compensation" program, RSi directors who leave or retire from
the  RSi Board in good standing may, with  the approval of the RSi Board, become
directors emeritus  and receive  consulting  payments. The  payments  constitute
between  25% and 80% of  the annual retainer fees paid  to RSi directors and are
paid for a period  of three to five  years following the director's  retirement.
The payment schedule and term depend upon the director's time in service, with a
minimum  of  five years'  service  required as  a  condition of  receipt  of any
benefit. Under the terms of  the program, Lee M.  Paschall would be entitled  to
annual payments of $14,400 for five years, John D. Sanders to annual payments of
$9,900  for five years, and  Irvin G. Ray to annual  payments of $9,000 for four
years. Mr. Killeen would  not be entitled  to any benefits  because he does  not
meet the minimum years of service requirement of the program.

    Also concurrently with entering into the Merger Agreement, COMSAT agreed, if
the  Merger is consummated, to indemnify, or  cause CTS America to indemnify, to
the fullest extent provided in the RSi Articles and RSi By-Laws, the persons who
are, at any time from and including the date of the Merger Agreement through and
including the Effective Date, the directors and officers of RSi and the trustees
of the ESOP. In addition,  COMSAT agreed that if  the Merger is consummated  and
there  is  then or  thereafter instituted  or pending  any action  or proceeding
challenging  the  Merger,   or  otherwise  seeking   to  restrain  or   prohibit
consummation of the transactions contemplated by the Merger Agreement or seeking
to  impose any  material limitations on  any provision of  the Merger Agreement,
then, in addition to the indemnification

                                       19
<PAGE>
described  above, COMSAT will  promptly advance expenses to  such persons to the
fullest extent permitted  by Nevada law  as if such  mandatory advancement  were
provided  for  in the  RSi Articles,  except  that COMSAT  shall not  require an
undertaking to repay such  expenses as a condition  to advancement. COMSAT  also
agreed,  if the  Merger is  consummated, to indemnify,  or cause  CTS America to
indemnify, to the fullest extent permitted by law, the trustees of the ESOP, and
to extend the coverage of COMSAT's fiduciary liability insurance to the trustees
of the ESOP. The trustees of the ESOP are Mark D. Funston and Anita M. Stutzman,
officers of RSi, and  George Reed, all  of whom are employees  of RSi. See  "THE
SPECIAL MEETING --Voting Rights."

THE MERGER AGREEMENT

    THE  FOLLOWING  IS  A BRIEF  SUMMARY  OF  CERTAIN PROVISIONS  OF  THE MERGER
AGREEMENT. THIS SUMMARY DOES NOT PURPORT TO BE COMPLETE AND IS QUALIFIED IN  ITS
ENTIRETY  BY REFERENCE TO THE MERGER AGREEMENT,  WHICH IS ATTACHED TO THIS PROXY
STATEMENT/PROSPECTUS AS EXHIBIT A AND IS INCORPORATED HEREIN BY REFERENCE.

    The Merger Agreement provides that, on the Effective Date, each  outstanding
share  of  RSi  Common  Stock, other  than  shares  owned by  RSi,  COMSAT  or a
subsidiary of RSi or of COMSAT, will be converted into that fraction of a  fully
paid  and non-assessable  share of COMSAT  Common Stock equal  to the Conversion
Fraction (the  fraction determined  by dividing  $18.25 by  the average  closing
price  of  the COMSAT  Common Stock  on the  NYSE Composite  Tape during  the 20
trading days  ending  five  trading days  prior  to  the date  of  the  Closing;
PROVIDED, that the Conversion Fraction shall not be less than .638 and shall not
be greater than .780).

    REPRESENTATIONS  AND  WARRANTIES.   The  Merger  Agreement  contains various
representations and  warranties relating  to, among  other things,  (i) each  of
COMSAT's  and RSi's and  certain of their  respective subsidiaries' organization
and  similar  corporate  matters,  (ii)  each  of  COMSAT's  and  RSi's  capital
structure,  (iii)  for each  of COMSAT  and  RSi, the  authorization, execution,
delivery and performance of the Merger  Agreement and related matters, (iv)  for
each  of COMSAT and RSi, the absence of conflicts with articles of incorporation
or bylaws, or violations  of any agreements or  court or administrative  orders,
where  such violations would have a material adverse effect on COMSAT's or RSi's
business, respectively, or  as to which  required consents or  waivers have  not
been  obtained prior to the Closing, (v) the provision to the other party of the
documents and reports  filed by  each of  COMSAT and RSi  with the  SEC and  the
accuracy  of the information  contained therein, (vi)  the accuracy of specified
information provided  by COMSAT  and by  RSi with  respect to  the  Registration
Statement  on Form S-4 filed  by COMSAT in connection  with the shares of COMSAT
Common Stock  to be  issued pursuant  to  the Merger  Agreement and  this  Proxy
Statement/ Prospectus, (vii) the absence, since June 30, 1993, of certain events
or changes relating to RSi's business or financial condition; (viii) the absence
of  material  undisclosed  liabilities  of  RSi,  (ix)  that  certain  specified
forecasts and projections  made by RSi  were based upon  reasonable grounds  and
disclosed  in good faith, (x) certain matters relating to property owned, leased
or used by RSi, (xi) certain  matters relating to RSi's contract backlog,  (xii)
certain  matters relating  to RSi's ownership  of and right  to use intellectual
property, (xiii)certain matters relating to RSi's material contracts, (xiv)  RSi
employee  membership  in  labor  unions or  employee  involvement  in  any union
organizational activity, (xv)  compliance by RSi  with labor laws  and with  the
Employee  Retirement  Income  Security  Act  ("ERISA"),  (xvi)  certain  matters
relating to  litigation against  RSi, (xvii)  maintenance of  insurance by  RSi,
(xviii)  compliance by  RSi with  applicable laws  and the  holding of necessary
permits and licenses, (xix) compliance by RSi with laws and regulations relating
to government  contracts,  (xx)  the  adequacy of  RSi's  reserves  for  product
warranties,  (xxi) compliance  by RSi  with environmental  laws and regulations,
(xxii) certain matters relating  to RSi's tax returns  and tax liabilities,  and
(xxiii)  that the shares of  COMSAT Common Stock to be  issued pursuant to or in
the transactions contemplated by  the Merger Agreement  will be validly  issued,
fully paid and nonassessable.

    CERTAIN  COVENANTS.  Pursuant to the  Merger Agreement, RSi has agreed that,
among other things, it will (i) provide COMSAT with a list of persons who may be
deemed "affiliates"  of  RSi  and  will  use its  best  efforts  to  cause  each
"affiliate"  to  deliver a  specified agreement  to COMSAT  (see "--  Resales of
COMSAT Common  Stock  Issued  in  the Merger;  Affiliates"),  (ii)  operate  its
business  only in the normal course and consistent with past practice, (iii) use
all  reasonable  efforts  to  preserve  intact  its  business  organization  and

                                       20
<PAGE>
goodwill,  (iv) use all reasonable efforts to keep available the services of its
key officers  and employees,  (v) use  all reasonable  efforts to  maintain  its
relationships  with significant customers, suppliers  and distributors, (vi) not
amend its Articles  of Incorporation or  By-Laws, (vii) other  than pursuant  to
outstanding  options or other  commitments, not sell  any securities, (viii) not
declare any dividends with respect to  its capital stock other than its  regular
semi-annual  cash dividends  not to  exceed $0.05 per  share, (ix)  not make any
acquisitions or dispositions other than in the ordinary course of business,  (x)
not  guarantee employment to or commit to  retain any employee after the date of
the Closing, (xi)  not accelerate  the vesting of  any options  to purchase  RSi
Common Stock, and (xii) except as limited by applicable law, provide COMSAT full
access to its properties, books, contracts and records.

    COMSAT  and RSi each have agreed (i) to use all reasonable efforts to obtain
all consents or authorizations required  in connection with the consummation  of
the  Merger, (ii) to use all reasonable efforts to resolve favorably any action,
suit,  proceeding  or  investigation  which  has  been  instituted  or  which  a
governmental  agency shall have indicated its intention to institute which could
lead to an order making the Merger  unlawful, (iii) not to take any action  that
would  cause the Merger not to qualify as a reorganization within the meaning of
Section 368 of the Internal  Revenue Code of 1986, as  amended, and (iv) not  to
take  any action that could result in the  Merger not being accounted for by the
pooling of interests method for financial reporting purposes.

    NO SOLICITATION OF OTHER TRANSACTIONS.   The Merger Agreement provides  that
RSi  will not,  and will not  permit any  of its officers,  directors, agents or
affiliates to,  directly  or  indirectly (i)  solicit,  encourage,  initiate  or
participate  in any  negotiations or  discussions with  respect to  any offer or
proposal to acquire all or substantially  all of its business and properties  or
capital  stock, whether by merger, purchase of assets, tender offer or otherwise
(an "Acquisition Proposal"),  or (ii) disclose  any information not  customarily
disclosed  to any person  concerning its business and  properties, afford to any
person or entity access to its properties, books or records or otherwise  assist
or  encourage any person  or entity in connection  with an Acquisition Proposal,
unless in  the case  of either  clause (i)  and or  clause (ii)  RSi shall  have
received a firm written offer relating to such transaction, not conditioned upon
financing,  from a reputable buyer, which offer, in the written opinion of Alex.
Brown, appears  to be  on terms  financially superior  to those  offered by  the
transactions  contemplated by  the Merger  Agreement and  which, in  the written
opinion of legal counsel to RSi  reasonably acceptable to COMSAT, the RSi  Board
is  legally obligated  to consider  by principles of  fiduciary duty  to the RSi
stockholders under the Nevada Law.

    CONDITIONS TO THE MERGER.  The  respective obligations of COMSAT and RSi  to
consummate  the Merger  are subject to  a number of  conditions, including among
others, (i) approval of  the Merger Agreement by  the stockholders of RSi,  (ii)
all  waiting periods under  the Hart-Scott-Rodino Antitrust  Improvements Act of
1976, as amended (the "HSR Act"), having been terminated or expired, (iii)  each
party  having  obtained  all necessary  consents,  approvals,  waivers, permits,
licenses or authorizations, including  any required by  regulations of the  U.S.
Department of Defense, (iv) the other party having performed and complied in all
material  respects with  all agreements,  covenants, obligations  and conditions
required by the  Merger Agreement, (v)  the truth and  correctness of the  other
party's representations and warranties, (vi) receipt of an opinion from Deloitte
&  Touche that the  Merger will be accounted  for as a  pooling of interests for
financial reporting  purposes,  (vii)  the  absence of  an  order  enjoining  or
restraining  the transactions contemplated  by the Merger  Agreement, and (viii)
receipt by each party of opinions of counsel to the other party. COMSAT and  RSi
made  the  required filings  under the  HSR Act  on February  14, 1994,  and the
waiting period expired on March 16, 1994.

    In addition to the conditions set  forth above, the obligation of COMSAT  to
effect  the Merger is subject to certain other conditions, including that (i) no
audit, investigation or due diligence review by COMSAT or its representatives of
RSi with respect  to RSi's  representations and warranties  shall have  revealed
liabilities  of  RSi not  previously  disclosed as  of  the date  of  the Merger
Agreement (whether then existing or arising after such date) which exceed  $7.56
million,  (ii) RSi's  aggregate contract backlog  in specified  categories be at
least $118.5 million on the date of the Closing, (iii) from June 30, 1993 to the
Closing there not have occurred certain  events or changes in specified  matters
relating  to RSi's business or financial condition which exceed, with respect to
certain of such events  or changes, $4.28 million  in the aggregate, (iv)  there
not be any action

                                       21
<PAGE>
or  proceeding challenging the Merger or the issuance of the COMSAT Common Stock
in  connection  therewith,  or  otherwise   seeking  to  restrain  or   prohibit
consummation of the transactions contemplated in the Merger Agreement or seeking
to impose any material limitations on any provision of the Merger Agreement, (v)
RSi  shall have used its best  efforts to cause, on or  prior to the date of the
Closing, Richard E.  Thomas to enter  into an employment  agreement with  COMSAT
(such  agreement was entered  into on January  30, 1994), and  (vi) COMSAT shall
have received a  letter, dated not  more than  two days prior  to the  Effective
Date, from Deloitte & Touche, independent auditors of RSi, as to certain matters
relating  to RSi's financial statements. Given the status of the Nevada Lawsuits
as of the date hereof, it is  COMSAT's present intention to waive the  condition
regarding  actions or  proceedings challenging  the Merger  with respect  to the
Nevada Lawsuits. See "-- Shareholder Litigation."

    In addition to  the conditions  set forth above,  the obligation  of RSi  to
effect  the Merger  is subject to  certain other conditions,  including that the
shares of  COMSAT Common  Stock  to be  issued in  the  Merger shall  have  been
approved for listing on the NYSE upon official notice of issuance.

    STOCK  OPTIONS; EMPLOYEE BENEFITS.  On  the Effective Date, each outstanding
option to acquire shares of RSi Common Stock (the "RSi Stock Options"),  whether
or  not then exercisable, will be assumed by COMSAT and converted into an option
(the "Substitute Option")  to acquire  that number  of shares  of COMSAT  Common
Stock equal to the Conversion Fraction multiplied by the number of shares of RSi
Common  Stock subject to  such RSi Stock  Option (at a  per share exercise price
adjusted to reflect the Conversion Fraction and rounded up to the nearest cent),
provided that such number of shares shall  be rounded down to the nearest  whole
number  of shares. Other than adjustments for  the number of shares for which an
option is exercisable and the exercise  price, the Substitute Options will  have
the  same duration and terms as the  original RSi Stock Options. Pursuant to the
Merger Agreement,  COMSAT has  agreed where  permitted under  the terms  of  the
COMSAT  1990 Key Employee  Stock Plan (the  "COMSAT Option Plan"),  to cause the
Substitute Options to be governed by the terms of the COMSAT Option Plan and  to
be  included in the registration statement for  the COMSAT Option Plan under the
Securities Act. For those Substitute Options that are not included in the COMSAT
Option Plan, COMSAT has agreed to  register under the Securities Act the  shares
of  COMSAT  Common  Stock  issuable  in connection  with  the  exercise  of such
Substitute Options following  the Merger.  As of  January 30,  1994, there  were
outstanding  RSi Stock Options to purchase an aggregate of 514,750 shares of RSi
Common Stock.

    Concurrently with entering into the  Merger Agreement, COMSAT agreed to  (i)
assume  the sponsorship of the  ESOP; (ii) make contributions  to the ESOP in an
amount sufficient to amortize the existing  ESOP loans in accordance with  their
terms or, in COMSAT's discretion, more rapidly; (iii) limit participation in the
ESOP  to persons who are  employed by CTS America,  the surviving corporation in
the Merger; and (iv)  indemnify the ESOP trustees  and all other fiduciaries  of
any  plans maintained  by RSi  prior to  the Merger.  COMSAT also  has agreed to
maintain the group  health coverage,  group life coverage  and group  disability
coverage  as provided to RSi employees prior to the Merger for at least one year
after the Effective Date,  and to provide continuation  coverage under COBRA  to
any persons who were entitled to such coverage from RSi immediately prior to the
Merger.

    TERMINATION.   The Merger Agreement  may be terminated at  any time prior to
the date of the Closing, whether before or after approval by the stockholders of
RSi, (i) by either  COMSAT or RSi  upon written notice if  a material breach  or
default  shall be made by the other party  with respect to performance of any of
the other party's covenants or representation and warranties and such breach  or
default  cannot be cured or  is not waived prior to  the Closing, (ii) by mutual
written consent of COMSAT and  RSi, or (iii) by either  COMSAT or RSi, if  their
respective  conditions to consummation of the  Merger have not been satisfied or
waived by December  31, 1994 or  such later date  as COMSAT and  RSi may  agree,
PROVIDED,  that such right to terminate shall  not be available to a party whose
failure to fulfill an obligation or perform a covenant has been the cause of  or
resulted  in the failure of any of  the conditions to consummation of the Merger
of the other party by such date.

    EXPENSES AND  TERMINATION  FEE.   Except  as  set forth  below,  the  Merger
Agreement  provides that in the  event the Merger is  not consummated each party
shall  be   responsible   for   its   own   costs,   fees   and   expenses.   If

                                       22
<PAGE>
the  termination is caused by  the breach of COMSAT  or RSi, the breaching party
shall pay to  the non-breaching  party, as the  non-breaching party's  exclusive
remedy,  the actual costs and expenses of the non-breaching party, not to exceed
$2.5 million. If the Merger  Agreement is terminated for  any reason and RSi  at
any time prior to December 31, 1994 is acquired by, merges or effects a business
combination  with, or  sells substantially  all of its  assets to  any person or
entity not controlled  by COMSAT,  or agrees  to do  any of  the foregoing,  the
Merger  Agreement  provides  that  RSi shall  immediately  upon  such  action or
agreement pay  to  COMSAT $5  million,  plus all  of  COMSAT's costs,  fees  and
expenses  incurred in  connection with the  Merger Agreement not  to exceed $2.5
million.

    AMENDMENT AND WAIVER.   COMSAT  and RSi may  waive any  of their  respective
conditions  to effecting the transactions  contemplated by the Merger Agreement,
provided that any waiver  of a condition  shall not constitute  a waiver of  any
other  conditions not so waived. To the  extent that at the Closing RSi delivers
to COMSAT  a  written  notice  specifying  the  failure  of  any  conditions  to
consummation  of the Merger or  the breach by RSi  of any of its representations
and warranties, and COMSAT proceeds with the Closing, COMSAT shall be deemed  to
have  waived for all purposes any rights or remedies it may have against RSi or,
except in the case of fraud or gross negligence, any of its directors,  officers
or  employees by reason of  the failure of any such  conditions or the breach of
any such representations or warranties to  the extent described in such  notice.
Following  the Closing, no claims for  breach of any representations, warranties
or agreements  shall be  brought against  any director  or officer  and  certain
employees  of RSi if and to the extent such person did not have actual knowledge
or had no reason to know (in light of circumstantial evidence made available  to
them  on or prior  to the Closing) of  the facts material to  such breach of any
representation, warranty or agreement.

    No interpretation, modification, termination or waiver of any portion of the
Merger Agreement shall  be binding  upon a  party unless  it is  in writing  and
executed  by the other parties to the Merger Agreement. No modification, waiver,
termination, rescission, discharge or cancellation  of any right or claim  under
the  Merger Agreement will affect the right of any party to the Merger Agreement
to enforce any other claim or right thereunder.

CLOSING; EFFECTIVE DATE

    The Closing will take place on the  day of approval of the Merger  Agreement
at  the Special Meeting or on the first business day following the date on which
the last of the  conditions set forth  in the Merger  Agreement is satisfied  or
waived, or at such other time as COMSAT and RSi agree. COMSAT and RSi anticipate
that  the Closing will take place on the  day of the Special Meeting. The Merger
Agreement provides that  the Merger will  become effective at  5:00 p.m.,  local
time  in Nevada, upon the later to occur of the filing of the Articles of Merger
with the Secretary  of State  of Nevada  as required by  the Nevada  Law or  the
filing  of the Certificate of Merger with the Secretary of State of the State of
Delaware as required  by Delaware  law or  at such time  as is  provided in  the
Articles  of Merger  or the Certificate  of Merger (the  "Effective Date"). Such
filings will be made as soon as practicable after the Closing.

EXCHANGE OF STOCK CERTIFICATES

    Promptly after the  Effective Date,  The Bank of  New York,  which has  been
designated  by COMSAT as the exchange agent  (the "Exchange Agent"), will mail a
letter of transmittal (the "Letter of Transmittal") to each holder of record  of
a  certificate or  certificates which  immediately prior  to the  Effective Date
represented  issued   and  outstanding   shares  of   RSi  Common   Stock   (the
"Certificates").  The Letter of Transmittal will contain instructions for use in
surrendering the Certificates in  exchange for certificates representing  shares
of  COMSAT Common Stock. The Letter  of Transmittal also will contain provisions
designed to  ensure  that the  issuance  of shares  of  COMSAT Common  Stock  in
connection  with the Merger will be in compliance with the applicable provisions
of the Communications Satellite Act of  1962, as amended (the "Satellite  Act"),
and the Articles of Incorporation of COMSAT, as amended (the "COMSAT Articles").
See  "DESCRIPTION OF COMSAT  CAPITAL STOCK." RSI  STOCKHOLDERS SHOULD NOT SUBMIT
THEIR CERTIFICATES FOR EXCHANGE UNLESS AND  UNTIL THEY HAVE RECEIVED THE  LETTER
OF TRANSMITTAL FROM THE EXCHANGE AGENT.

                                       23
<PAGE>
    Upon surrender of a Certificate for exchange to the Exchange Agent, together
with  the duly  executed Letter of  Transmittal, the holder  of such Certificate
will be entitled to receive in  exchange therefor a certificate or  certificates
representing  the number of  shares of COMSAT  Common Stock that  such holder is
entitled to  receive pursuant  to the  Merger Agreement,  plus cash  in lieu  of
fractional  shares of COMSAT Common Stock.  All Certificates so surrendered will
be cancelled.

    If any  certificate representing  shares of  COMSAT Common  Stock is  to  be
issued  in  a name  other  than that  in  which the  surrendered  Certificate is
registered, the  Certificate  so  surrendered  must  be  properly  endorsed  (or
accompanied  by an appropriate instrument of  transfer) and otherwise must be in
proper form for transfer, and the  person requesting such exchange must pay  the
Exchange  Agent any transfer or other taxes required by law, or establish to the
satisfaction of  the Exchange  Agent  that such  tax has  been  paid or  is  not
payable.  After the Effective Date, there will  be no transfers of shares of RSi
Common Stock which were outstanding immediately prior to the Effective Date. If,
after the Effective  Date, Certificates representing  such shares are  presented
for  transfer to the Exchange Agent or RSi, they will be cancelled and exchanged
for certificates  representing shares  of COMSAT  Common Stock  pursuant to  the
terms of the Merger Agreement.

    Each share of COMSAT Common Stock for which RSi Common Stock is exchanged in
the  Merger  will  be  deemed  to  have  been  issued  on  the  Effective  Date.
Accordingly, RSi stockholders who receive COMSAT Common Stock in the Merger will
be entitled to receive any dividends or other distributions which may be payable
to holders of record  of such stock  as of dates  following the Effective  Date.
COMSAT will not be required to pay dividends or other distributions with respect
to  any  shares of  such COMSAT  Common Stock,  however, until  the Certificates
formerly representing shares of RSi Common Stock have been surrendered.  Accrued
dividends  and  other  distributions will  be  paid without  interest  upon such
surrender.

NO FRACTIONAL SHARES

    No certificates or  scrip representing  fractional shares  of COMSAT  Common
Stock  will be issued in the Merger.  In lieu of fractional shares, the Exchange
Agent will pay  to any holder  who would be  entitled to a  fractional share  of
COMSAT  Common Stock, upon surrender of such holder's Certificates together with
a duly executed  Letter of  Transmittal, an  amount of  cash (without  interest)
equal to the product of such fractional interest multiplied by the closing price
of a whole share of COMSAT Common Stock on the NYSE on the last full trading day
prior to the Effective Date.

THE STOCK OPTION AGREEMENT

    THE  FOLLOWING  IS A  SUMMARY  OF THE  MATERIAL  TERMS OF  THE  STOCK OPTION
AGREEMENT. THIS SUMMARY DOES NOT PURPORT TO BE COMPLETE AND IS QUALIFIED IN  ITS
ENTIRETY  BY REFERENCE TO THE STOCK OPTION AGREEMENT. THE FULL TEXT OF THE STOCK
OPTION AGREEMENT IS ATTACHED TO THIS PROXY STATEMENT/PROSPECTUS AS EXHIBIT B AND
IS INCORPORATED HEREIN BY REFERENCE.

    In connection with and as a condition to COMSAT's willingness to enter  into
the  Merger Agreement, RSi  and COMSAT entered into  the Stock Option Agreement.
Under the Stock Option  Agreement, RSi granted to  COMSAT an irrevocable  option
(the  "COMSAT Option") to  purchase 1,242,778 shares of  RSi Common Stock, which
represents the number of shares equal to  15% of the shares of RSi Common  Stock
outstanding  on January 30, 1994,  the date of the  Stock Option Agreement, at a
price per share of $18.25 (the "COMSAT Option Exercise Price").

    Pursuant to the Stock Option Agreement, if COMSAT or CTS America is not then
in material breach  of its obligations  under the Merger  Agreement, COMSAT  may
exercise  the  COMSAT  Option,  in  whole  or  in  part,  at  any  time,  if any
corporation,  partnership,  person,  other  entity  or  group  (collectively,  a
"Person"), other than COMSAT or any of its subsidiaries, (i) acquires beneficial
ownership  of at least 15 percent of the outstanding shares of RSi Common Stock,
(ii) enters into an agreement  with RSi or any  of its material subsidiaries  to
merge  or consolidate with RSi or any of its subsidiaries, or to purchase all or
substantially  all  of  the  assets  of   RSi  (or  effects  any  such   merger,
consolidation or purchase) and the Merger Agreement is

                                       24
<PAGE>
terminated,  or (iii) has commenced or commences  a tender or exchange offer for
at least 15 percent of  the outstanding shares of RSi  Common Stock that is  not
opposed  by RSi  and RSi is  no longer  supporting the Merger  Agreement and the
transactions contemplated thereby.

    In the event that the COMSAT Option becomes exercisable as described in  the
preceding paragraph, COMSAT may elect to receive cash, in lieu of exercising the
COMSAT  Option, in  an amount  equal to  the "COMSAT  Option Value."  The COMSAT
Option Value is  equal to  the product of  (x) the  excess, if any,  of (a)  the
highest  price per  share paid  or proposed  to be  paid in  connection with any
transaction specified in clause (i) ,  (ii) or (iii) of the preceding  paragraph
or in clause (ii) of the following paragraph (a "Transaction") for any shares of
RSi Common Stock, or the greatest aggregate consideration paid or proposed to be
paid  in connection  with any  Transaction for  the purchase  of assets  of RSi,
divided by the number  of shares of  RSi Common Stock  then outstanding, as  the
case  may be, over (b)  the COMSAT Option Exercise  Price, multiplied by (y) the
total number of shares still subject to the COMSAT Option. Such payment shall be
made by delivery of immediately available  funds to COMSAT and shall  extinguish
all other rights of COMSAT under the Stock Option Agreement.

    Under  the  Stock Option  Agreement, COMSAT  is entitled  to receive  a cash
payment equal to the COMSAT  Option Value if (i) prior  to the date which is  30
days  after the termination of the Merger Agreement (the "Termination Date") any
Person, other than COMSAT or any  of its affiliates, shall publicly announce  or
communicate to RSi a proposal (a) to merge or consolidate with RSi or any of its
subsidiaries,  or  to purchase  all or  substantially  all of  the assets  of or
otherwise to acquire RSi, or (b) to make any tender or exchange offer for shares
of RSi Common Stock, and  (ii) within one year  after the Termination Date  such
Person  or a related Person (a) acquires  at least 15 percent of the outstanding
shares of RSi Common Stock, (b) enters into an agreement with RSi or any of  its
subsidiaries  to merge or consolidate with RSi  or any of its subsidiaries or to
purchase all or  substantially all of  the assets  of RSi (or  effects any  such
merger,  consolidation or purchase) or (c)  commences a tender or exchange offer
for at least 15 percent  of the outstanding shares of  RSi Common Stock that  is
supported by RSi.

    The  COMSAT Option is not assignable or transferable, other than to a wholly
owned subsidiary of  COMSAT. Within  three years of  the first  exercise of  the
COMSAT  Option, RSi  shall, upon the  reasonable request of  COMSAT, prepare and
file with the  SEC a  registration statement  for the  offer and  sale or  other
disposition  of the shares of RSi Common Stock acquired by or issuable to COMSAT
upon exercise of the COMSAT Option. RSi  will use its best efforts to list  such
shares  of RSi  Common Stock  on the NASDAQ/  NMS or  other market  which is the
principal trading market for the RSi Common Stock.

    COMSAT's right  to exercise  the COMSAT  Option, as  well as  all its  other
rights   under  the  Stock  Option  Agreement,  terminates  30  days  after  the
termination  of  the  Merger  Agreement.   See  "--  The  Merger  Agreement   --
TERMINATION."

    The Stock Option Agreement does not require RSi stockholder approval. If the
RSi  stockholders  do  not approve  the  Merger Agreement  and  the transactions
contemplated thereby, the Stock Option Agreement  will continue to be a  binding
obligation  of  RSi  until the  termination  of  the Stock  Option  Agreement as
described above.

DELISTING AND DEREGISTRATION OF RSI COMMON STOCK AFTER THE MERGER

    If the Merger  is consummated, RSi  Common Stock will  be delisted from  the
NASDAQ/NMS and will be deregistered under the Exchange Act.

RESALES OF COMSAT COMMON STOCK ISSUED IN THE MERGER; AFFILIATES

    The  shares of COMSAT Common Stock to be issued in the Merger will have been
registered under the  Securities Act.  Such shares will  be freely  transferable
under  the Securities  Act, except for  shares issued  to any person  who may be
deemed to be  an affiliate (as  such term is  defined for purposes  of Rule  145
under  the Securities Act, an  "Affiliate") of COMSAT or RSi  at the time of the
Special Meeting. Affiliates  may not sell  their shares of  COMSAT Common  Stock
acquired  in  connection with  the Merger  except pursuant  to (i)  an effective
registration statement  under  the Securities  Act  covering such  shares,  (ii)
paragraph  (d) of Rule 145 in the case  of persons who were Affiliates of RSi at
the time of the Special Meeting,  or (iii) any other applicable exemption  under
the  Securities Act (such  as Rule 144 under  the Securities Act  in the case of

                                       25
<PAGE>
persons who  are or  become Affiliates  of COMSAT).  Persons who  may be  deemed
Affiliates  of  COMSAT or  RSi generally  include  individuals or  entities that
control, are controlled by, or are under  common control with COMSAT or RSi  and
may include certain officers and directors of COMSAT or RSi.

    SEC  guidelines indicate further  that the "pooling  of interests" method of
accounting generally will not be challenged on  the basis of sales of shares  by
Affiliates of the acquiring or acquired company if the Affiliates do not dispose
of more than a minimal number of the shares of the acquiring or acquired company
that  the Affiliates own, or shares of  a corporation they receive in connection
with the  merger, during  the period  beginning 30  days before  the merger  and
ending  when  financial  results  covering  at  least  30  days  of  post-merger
operations of the combined enterprise have been published. RSi has agreed to use
its best efforts to obtain written agreements ("Affiliate Agreements") at  least
30  days in  advance of the  Special Meeting  from persons identified  by RSi as
Affiliates of RSi, containing appropriate representations and covenants intended
to ensure compliance  with the  Securities Act and  to preserve  the ability  to
account for the Merger as a "pooling of interests."

NYSE LISTING OF COMSAT COMMON STOCK

    The  Merger Agreement  provides that  COMSAT shall  use its  best efforts to
obtain, prior to the Effective Date, approval for the listing on the NYSE,  upon
official  notice of issuance, of the shares  of COMSAT Common Stock to be issued
in connection with  the Merger. Such  listing approval is  a condition to  RSi's
obligation to consummate the Merger.

REGULATORY MATTERS

    FEDERAL  COMMUNICATIONS COMMISSION.  COMSAT  was established pursuant to the
Satellite Act.  Under the  Satellite Act,  the financing  activities of  COMSAT,
including  COMSAT's ability to issue debt  and equity securities, are subject to
oversight and regulation by the  Federal Communications Commission (the  "FCC").
COMSAT  currently  is  subject  to  an  FCC-approved  capitalization  plan  (the
"Capitalization Plan")  which sets  forth the  parameters for  COMSAT's  capital
structure.  Pursuant to  the Capitalization Plan,  COMSAT is  permitted to issue
equity securities, including  the shares  of COMSAT  Common Stock  to be  issued
pursuant to, and in the transactions contemplated by, the Merger Agreement, upon
two  days'  notice to  the FCC  so long  as  COMSAT is  in compliance  with such
parameters. See  "DESCRIPTION  OF COMSAT  CAPITAL  STOCK --  Other."  COMSAT  is
currently  in compliance with such parameters and filed the required notice with
the FCC on February 10, 1994. RSi  holds FCC licenses, transfer of ownership  of
which  requires  FCC  approval. It  is  a  condition to  COMSAT's  obligation to
consummate the Merger that RSi obtain all consents, permits and licenses  which,
if  not obtained prior to the date of the Closing, would have a material adverse
effect on the ability to conduct the business of RSi following the Closing.  RSi
filed  the required applications  for transfer of  the licenses with  the FCC on
March 25, 1994.

    ANTITRUST.  Pursuant to the HSR  Act, and the rules promulgated  thereunder,
COMSAT  and RSi  each provided  the required  notifications with  respect to the
Merger to the Federal  Trade Commission and the  Antitrust Division of the  U.S.
Department of Justice on February 14, 1994. The waiting period under the HSR Act
with respect to the Merger expired on March 16, 1994.

CERTAIN FEDERAL INCOME TAX CONSEQUENCES OF THE MERGER

    The following is a general discussion of the principal United States federal
income  tax  consequences  of the  Merger.  This  discussion is  based  on laws,
regulations, rulings  and decisions  in effect  as  of the  date of  this  Proxy
Statement/Prospectus,  all  of which  are  subject to  change,  retroactively or
prospectively, or possibly differing interpretations. Moreover, no rulings  will
be  obtained from the Internal Revenue Service (the "IRS") regarding the federal
income tax consequences  of the  Merger or any  other matters,  and neither  the
opinion  of  counsel (referred  to below)  nor this  discussion is  binding upon
either the IRS or the courts. Further, this discussion does not purport to  deal
with  the  federal  income  tax consequences  applicable  to  all  categories of
investors, some of which may be subject  to special rules, or with state,  local
or  foreign law.  Thus, RSi  stockholders receiving  COMSAT Common  Stock in the
Merger are urged  to consult their  own tax  advisors as to  the particular  tax
consequences to them of the Merger under federal, state, local, foreign or other
applicable law.

                                       26
<PAGE>
    Shaw,  Pittman, Potts & Trowbridge, counsel  to RSi, has rendered an opinion
to RSi  and COMSAT  to the  effect that,  among other  things, the  Merger  will
constitute  a  reorganization within  the meaning  of Sections  368(a)(1)(A) and
368(a)(2)(D) of the  Internal Revenue  Code of  1986, as  amended (the  "Code").
Assuming that the Merger constitutes such a reorganization:

        1.   No gain or loss will be recognized by RSi, COMSAT or CTS America as
    a result of the Merger;

        2.  No gain  or loss will  be recognized by any  RSi stockholder on  the
    exchange  by  such stockholder  of its  RSi Common  Stock for  COMSAT Common
    Stock;

        3.   Each RSi  stockholder will  take  a basis  for federal  income  tax
    purposes  in the COMSAT Common  Stock it receives as  a result of the Merger
    equal to  such  stockholder's basis  in  its RSi  Common  Stock  surrendered
    therefor (reduced by any amount allocable to a fractional share interest for
    which cash is received);

        4.   Each RSi stockholder will have  a holding period for federal income
    tax purposes with respect to the COMSAT Common Stock it receives as a result
    of the Merger that includes  such stockholder's holding period with  respect
    to the RSi Common Stock surrendered therefor, provided that such stockholder
    held  its shares of RSi Common Stock  as capital assets immediately prior to
    the Effective Date; and

        5.  Each RSi  stockholder receiving cash in  lieu of a fractional  share
    interest  generally  should  be  treated  as  if  such  stockholder actually
    received such fractional share interest  and such interest was  subsequently
    redeemed  by COMSAT. This  redemption generally should  result in either (i)
    capital gain or loss measured by  the difference between the amount of  cash
    received  and the portion of the stockholder's basis in its RSi Common Stock
    allocable to the fractional share of COMSAT Common Stock deemed redeemed, or
    (ii) a  dividend  in  an  amount  equal to  the  amount  of  cash  received,
    depending,  among other things, on the stockholder's percentage ownership of
    COMSAT, including ownership by attribution.

    The foregoing, including the opinion  of Shaw, Pittman, Potts &  Trowbridge,
is  conditioned upon the accuracy, as of the date hereof and as of the Effective
Date, of certain assumptions including, but not limited to: (i) the fair  market
value  of  the COMSAT  Common Stock  received  by each  RSi stockholder  will be
approximately equal to the fair market  value of the RSi Common Stock  exchanged
therefor;  (ii) CTS America will acquire at  least 90 percent of the fair market
value of the net assets and at least 70 percent of the fair market value of  the
gross  assets held by RSi  immediately prior to the  Merger (treating RSi assets
used to pay its reorganization expenses or to redeem RSi Common Stock during the
past 36 months as  assets held by  RSi immediately prior  to the Merger);  (iii)
COMSAT has no plan or intention to sell and CTS America has no plan or intention
to  issue CTS America stock if  the effect of such sale  or issuance would be to
reduce COMSAT's ownership of CTS  America stock to an  amount that is less  than
the  amount required for COMSAT to be deemed to be in control of CTS America for
purposes of  Section  368(a)(2)(D) of  the  Code; (iv)  COMSAT  has no  plan  or
intention  to reacquire  any of the  shares of  COMSAT Common Stock  issued as a
result of the  Merger; (v)  COMSAT has  no plan  or intention  to liquidate  CTS
America,  to merge  CTS America  with and into  another corporation,  to sell or
otherwise dispose of the stock of CTS  America, or to cause CTS America to  sell
or  otherwise dispose of  any of the  assets acquired in  the Merger, except for
sales or dispositions in the ordinary course of business or transfers  described
in  Section 368(a)(2)(C) of the Code; (vi) COMSAT, CTS America, RSi, and the RSi
stockholders will pay their respective expenses, if any, incurred in  connection
with  the  Merger, except  that  RSi and  CTS America  may  pay or  assume those
expenses of RSi that are solely and directly related to the Merger; (vii)  after
the  Merger,  CTS  America  will  continue  RSi's  historic  business  or  use a
significant portion of RSi's assets in a business; (viii) the liabilities of RSi
assumed by CTS America  and the liabilities to  which the transferred assets  of
CTS  America are  subject were  incurred by  RSi in  the ordinary  course of its
business; (ix) there is no  intercorporate indebtedness existing between  COMSAT
and  RSi or between  CTS America and RSI  that was issued,  acquired, or will be
settled at  a  discount;  (x)  the  fair market  value  of  the  assets  of  RSi
transferred  to CTS America will equal or  exceed the sum of liabilities assumed
by CTS America, plus the amount of liabilities, if any, to which the transferred
assets are subject;  (xi) as  of the  Effective Date,  the value  of the  COMSAT
Common Stock

                                       27
<PAGE>
received  by RSi stockholders as a result of  the Merger was greater than 50% of
the value  of all  the RSi  Common Stock  outstanding immediately  prior to  the
Effective  Date (treating fractional share interests for which cash is received,
and stock redeemed within the past 36 months, as outstanding RSi Common  Stock);
and (xii) the stockholders of RSi who own five percent or more of the RSi Common
Stock (and, to the best of the knowledge of the management of RSi, the remaining
stockholders  of RSi) have no  plan or intention to  sell, exchange or otherwise
dispose of a number of shares of COMSAT Common Stock received in the Merger that
would reduce the RSi stockholders' ownership of COMSAT Common Stock to a  number
of shares having a value as of the Effective Date of less than 50 percent of the
value  of all the formerly outstanding RSi Common Stock immediately prior to the
Effective Date (treating fractional share interests for which cash is  received,
and stock redeemed within the past 36 months, as outstanding RSi Common Stock).

ACCOUNTING TREATMENT

    COMSAT  and  RSi believe  that  the Merger  will  qualify as  a  "pooling of
interests" for  accounting and  financial reporting  purposes .  The pooling  of
interests  method is intended to present as a single interest two or more common
shareholder  interests  which  were  previously  independent.  The  pooling   of
interests  method assumes  that the  combining companies  have been  merged from
inception. Consequently, the historical  financial statements for periods  prior
to  the consummation of the combination are restated as though the companies had
been combined. The  restated financial  statements are adjusted  to conform  the
accounting  policies  of the  separate  companies. See  "COMSAT  CORPORATION AND
RADIATION  SYSTEMS,  INC.  UNAUDITED  PRO  FORMA  COMBINED  CONDENSED  FINANCIAL
STATEMENTS."

    It is a condition to the obligations of the parties to consummate the Merger
that  each of them receive  a letter from Deloitte  & Touche, independent public
accountants for both  COMSAT and  RSi, dated  the date  of the  Closing, to  the
effect  that the  Merger will  qualify as  a pooling  of interests.  See "-- The
Merger Agreement -- CONDITIONS TO THE MERGER."

APPRAISAL RIGHTS

    The Nevada Law does not provide a  right of dissent or appraisal to  holders
of  shares of  any class  which, at  the record  date fixed  for the  meeting of
stockholders at which a  plan of merger is  to be voted on,  is designated as  a
national  market  system  security on  an  interdealer quotation  system  by the
National Association of Securities Dealers, Inc. ("NASDAQ/NMS Security")  unless
the  holders of  the class of  shares are required  under the plan  of merger to
accept for such shares anything except cash, shares, or shares and cash in  lieu
of  fractional  shares of  the surviving  corporation  or any  other corporation
which, at the effective  date of the  plan of merger, are  listed on a  national
securities exchange. As of the Record Date, the RSi Common Stock is a NASDAQ/NMS
Security and it is anticipated that, as of the Effective Date, the COMSAT Common
Stock  will continue to  be listed on  the NYSE, which  is a national securities
exchange. Accordingly,  holders of  RSi Common  Stock will  not be  entitled  to
dissent and obtain payment for their shares of RSi Common Stock under the Nevada
Law.

OPERATIONS AFTER THE MERGER

    On the Effective Date, RSi will be merged into CTS America, and CTS America,
as  the surviving  corporation in  the Merger, will  continue as  a wholly owned
subsidiary of COMSAT. COMSAT's existing systems integration division, CTS,  will
be  combined  with  CTS America  to  form  COMSAT RSI.  Richard  E.  Thomas, the
Chairman, President and Chief Executive Officer of RSi, will become President of
COMSAT RSI and  an officer of  COMSAT, and  certain other officers  of RSi  will
become  Vice Presidents of COMSAT  RSI. See "-- Interests  of Certain Persons in
the Merger; Employment Agreements."

                         INFORMATION CONCERNING COMSAT

GENERAL

    COMSAT, which was incorporated in 1963, is an international  communications,
information  and entertainment distribution services company. It provides voice,
video and data services and is the largest owner and user of the global INTELSAT
and Inmarsat communications satellite networks. COMSAT also

                                       28
<PAGE>
provides  satellite  systems  integration,   wireless  networks  and   technical
consulting;  offers  on-demand  entertainment and  information  services  to the
hospitality industry; and owns  the NBA Denver  Nuggets. COMSAT was  established
pursuant  to the  Satellite Act  and certain  of its  activities are  subject to
oversight and regulation by the  FCC. COMSAT has approximately 1,640  employees.
COMSAT's  principal executive  offices are  located at  6560 Rock  Spring Drive,
Bethesda, Maryland 20817, telephone number (301) 214-3000.

    COMSAT has paid  a regular quarterly  dividend to its  shareholders for  the
past  94 consecutive  quarters. COMSAT's  current regular  quarterly dividend is
$0.185 per share. See "COMPARATIVE MARKET PRICE DATA."

    Additional information  concerning COMSAT  is contained  in COMSAT's  Annual
Report on Form 10-K for the year ended December 31, 1993 filed on March 31, 1994
(including  Amendment No.  1 thereto  filed on April  29, 1994)  and its Current
Reports on Form 8-K filed with the SEC on February 1, 1994, March 7, 1994, March
11, 1994 and April 26, 1994.  See "AVAILABLE INFORMATION" and "INCORPORATION  OF
CERTAIN DOCUMENTS BY REFERENCE."

RECENT DEVELOPMENTS

    On  April 15, 1994, COMSAT reported revenues for the quarter ended March 31,
1994 of $169.5 million compared to $166.3 million for the comparable quarter  of
1993.  Net income for the quarter was $18.3 million or $0.45 per share, compared
to $19.6 million or $0.48 per share for the comparable quarter of 1993. However,
net income  for the  first quarter  of 1994  was unchanged  from the  comparable
quarter  of  1993  after excluding  $1.3  million  or $0.03  per  share  in 1993
resulting from the cumulative effect of an accounting change for income taxes.

                           INFORMATION CONCERNING RSI

GENERAL

    RSi, which was incorporated in  1960, designs, manufactures, and  integrates
systems,  subsystems and components for advanced microwave communications, radar
and related applications, from the largest international gateway earth  stations
for  satellite transmission of voice, data and video, to electronically-scanning
phased array antennas for the North Warning System, to the high power switch for
the Patriot missile. RSi has a solid base of expertise in meeting the  demanding
requirements  of  the  U.S.  Government for  special  use  antennas  and related
subsystems in air traffic control, intelligence and scientific applications,  as
well   as  for  military  uses  such  as  radar,  line-of-site  radio-relay  and
troposcatter communications.  RSi  is  also a  leading  commercial  supplier  of
microwave  antennas for worldwide cellular markets, satellite downlink terminals
for distance  learning  and  business networks,  sector  antennas  for  Europe's
digital  personal and mobile  communications markets, and  base station antennas
for U.S. and  European trials of  wireless local area  networks (LANs). RSi  has
approximately  1,000 employees. RSi's principal executive offices are located at
1501 Moran Road, Sterling, Virginia 20166, telephone number (703) 450-5680.

    Additional information concerning RSi is contained in RSi's Annual Report on
Form 10-K for the fiscal year ended  June 30, 1993 (including Amendments No.  1,
No.  2 and No.  3 thereto), its Quarterly  Reports on Form  10-Q for the quarter
ended September 30,  1993 (including Amendment  No. 1 thereto)  and the  quarter
ended  December 31, 1993 and its Current Reports  on Form 8-K filed with the SEC
on March 7, 1994  (including Amendment No.  1 thereto) and  April 28, 1994.  See
"AVAILABLE INFORMATION" and "INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE."

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
OPERATIONS

    The  following discussion  does not reflect  any changes  to RSi's financial
condition, operations, liquidity, cash flow or capital resources relating to the
Merger.

OVERVIEW

    RSi believes its military and commercial program diversity and core products
and technologies in the areas of communications, surveillance, and radar make it
more resistant than others  to the changing  U.S. defense marketplace.  However,
recognizing  the potential uncertainty  concerning the size  of the U.S. defense

                                       29
<PAGE>
budget and the  maturing in fiscal  year 1994  of several of  its contracts  for
military  radar  and  troposcatter  antennas,  which  could  adversely  affect a
significant portion of  RSi's business,  RSi intends to  continue its  strategic
initiatives and actively pursue diversification into the international satellite
and  wireless communications markets  as well as the  U.S. Government market for
commercial off-the-shelf satellite communications systems.

RESULTS OF OPERATIONS

    FISCAL YEARS  ENDED JUNE  30, 1993,  1992  AND 1991.   The  following  table
presents an analysis of sales for the years indicated (in millions):

<TABLE>
<CAPTION>
                                                               1993                    1992                    1991
                                                      ----------------------  ----------------------  ----------------------
<S>                                                   <C>        <C>          <C>        <C>          <C>        <C>
Satellite Communications............................  $    23.2         19%   $    34.4         27%   $    50.5         44%
Tactical Military...................................       13.2         11         13.3         11          6.0          5
Wireless............................................       17.3         15         14.0         11         12.5         11
Scientific/Special..................................       31.2         26         26.8         21          7.5          6
Radar/Navigation Aids...............................       33.9         29         38.6         30         39.0         34
                                                      ---------        ---    ---------        ---    ---------        ---
                                                      $   118.8        100%   $   127.1        100%   $   115.5        100%
                                                      ---------        ---    ---------        ---    ---------        ---
                                                      ---------        ---    ---------        ---    ---------        ---
</TABLE>

    Sales  for 1993 declined by  $8.3 million or 7%  from 1992. This decline was
due primarily  to  the completion  in  June 1992  of  the Channel  One  contract
(satellite  communications), which represented  sales of $16.2  million in 1992,
and to  tornado  damage in  October  1992  at RSi's  manufacturing  facility  in
Florida,  which affected production  and was responsible for  a sales decline of
approximately $7.2 million over  the year (radar/navigation  aids). To a  lesser
extent,  sales for 1993 declined from 1992 due to a weakened British pound which
impacted reported sales from RSi's foreign operations. The sales decline between
1992 and  1993  was  offset,  however, by  strong  international  sales  growth,
especially  in wireless markets, as  sales to foreign users  increased by 31% to
$28 million, by  a $5 million  increase in domestic  sales of turnkey  satellite
systems  (satellite communications),  and by  an increase  of approximately $4.4
million in  scientific/special applications  sales  to non-DOD  U.S.  Government
customers.

    See  Note 1  to RSi's  audited financial  statements included  in "RADIATION
SYSTEMS, INC. CONSOLIDATED  FINANCIAL STATEMENTS"  for a  discussion of  certain
business  interruption insurance claims.  Business interruption insurance income
amounted to $2,996,000 in 1993 and $1,306,000 in 1992.

    Sales for 1992 increased  by $11.6 million or  10% from 1991. This  increase
was  due  primarily to  increased sales  for scientific/special  applications of
$19.3 million over the year, of which approximately $12.8 million was due to the
Green Bank Telescope  contract awarded  in December  1990. Sales  for 1992  also
increased over August 1991 due to increased sales of tactical military products,
including  sales from one of the U.K.  companies acquired by RSi in August 1991,
and to  sales  of  satellite communications  antennas  primarily  in  developing
nations.  These increases,  however, were offset  by a $20.6  million decline in
sales of small satellite communications antennas for the Channel One program.

    Gross margins as a percent of sales increased to 26.7% in 1993 from 26.6% in
1992, primarily due to favorable changes in the sales mix. Operating margins  as
a  percent of sales  held constant at 13.2%  in 1993 and  1992, as the favorable
effects of the increased business interruption insurance and the slightly higher
gross margins  in  1993 were  offset  by the  effect  of increased  general  and
administrative expenses as a percent of sales in 1993, as compared with 1992.

    General  and administrative  expenses rose 4%  in 1993 primarily  due to the
mid-year acquisition of Anghel Laboratories. To a lesser extent, higher research
and development and international marketing costs contributed to this  increase.
Excluding  Anghel Laboratories, general and administrative expenses declined 1%,
primarily due to selected cost reduction actions and the weakened British pound,
offset by the cost increases referred to above.

                                       30
<PAGE>
    Earnings before income taxes declined by 8% in 1993 from 1992, primarily  as
a  result of the reduced  sales discussed above, and  to a lesser extent, higher
interest costs. The  amount of earnings  before income taxes  for 1993 were  not
materially  impacted  by  the  tornado damage  in  Florida  as  accrued business
interruption insurance offset the loss of estimated earnings recognizable  under
normal operating conditions.

    Earnings  before income taxes in 1992 increased by 25% over 1991 due largely
to an improvement in the gross margin rate to 26.6% in 1992 from 22.5% in  1991,
resulting  from a more favorable sales mix. To a lesser extent, earnings of $1.3
million associated  with the  U.K.  subsidiaries acquired  in August  1991  also
contributed  to the increase. Operating margins  also increased to 13.2% in 1992
from 11.7% in 1991, principally  as a result of  the improved gross margin  rate
and  business interruption insurance in 1992,  offset partially by the effect of
higher general and  administrative expenses as  a percent of  sales in 1992,  as
compared  with 1991.  The increase  in general  and administrative  expenses was
substantially associated with the acquisition  of the U.K. companies.  Adjusting
for  the acquisition,  general and  administrative expenses  rose 7.3%  in 1992,
primarily from research programs in the satellite communications area and higher
payroll and related costs.

    Excluding the effect of a  favorable adjustment of $310,000 associated  with
completion  of  a long-term  radiotelescope contract  (on  which taxes  had been
deferred for several years at 46%), the effective tax rate declined to 36.3%  in
1993  from 37.4%  in 1992.  The decline  in the  rate reflected  tax benefits on
higher foreign sales and the favorable mix of state taxable income.

    The effective  tax rate  decreased to  37.4%  in 1992  from 38.1%  in  1991,
primarily  as a result of lower tax rates on foreign earnings, reduced effective
state income tax rates,  and slightly higher Federal  tax benefits on  increased
exports.

    Earnings  per share declined  by $.04 in  1993 from 1992  predominantly as a
result of the decline in net earnings between years.

    Earnings per share increased by  $.26 to $1.27 in  1992 from $1.01 in  1991.
This  reflects the increased net earnings ($.27) reduced by the effect of higher
weighted average shares outstanding ($.01).

    THREE AND SIX MONTHS ENDED DECEMBER 31,  1993.  Sales for the quarter  ended
December  31,  1993,  declined  by  $1.4 million  or  5%  as  compared  with the
comparable quarter of the  preceding fiscal year, primarily  as a result of  the
maturing  of certain U.S.  defense-related contracts and delays  in the award of
certain commercial satellite  antenna contracts,  partially offset  by sales  of
microwave   communication  products  associated  with  the  Anghel  Laboratories
division acquired in January  1993, and by increased  pedestal sales from  RSi's
Florida  unit as it continues  its return to full production  in the wake of the
tornado damage in October 1992. While  pedestal sales showed improvement in  the
second  quarter,  they  did not  reach  the  levels planned  had  the  storm not
occurred.

    Sales for the first half of fiscal year 1994 declined by $7.9 million or 13%
as compared with the same  period a year ago,  primarily for the reasons  stated
above  as well as  lower sales for scientific  applications, and depreciation of
the British pound which  impacted sales from  RSi's U.K.-based operations.  This
decline   was  partially  offset  by  sales   associated  with  the  new  Anghel
Laboratories division.

    Earnings before  income taxes  for the  second quarter  declined by  42%  as
compared with the second quarter for the previous fiscal year due largely to the
delay  in the settlement of RSi's  business interruption insurance claim and the
reduction in sales referred to above.  Excluding the effect of accrued  business
interruption  insurance associated with the tornado damage in Florida, operating
margins in the second quarter  declined to 8.3%, as  compared with 10.1% in  the
same  quarter a year  ago, primarily due  to accrued losses  associated with two
contracts for large antennas.

    Earnings before income taxes for the first half of fiscal year 1994 declined
by 31% as  compared with the  same period a  year ago principally  for the  same
reasons  mentioned above. Higher interest costs  also contributed to the decline
in this period. Excluding the effect of accrued business interruption insurance,
operating margins in the  first half of  fiscal year 1994  declined to 8.9%,  as
compared with 11.3% in the same

                                       31
<PAGE>
period a year ago, primarily due to accrued losses associated with two contracts
for  large antennas, changes in  the sales mix, and  the fact that RSi's Florida
unit had the  comparative benefit of  operating under normal  conditions in  the
first quarter of the prior fiscal year.

    Interest  expense,  net  of  investment  income,  increased  by  $68,000 and
$226,000  for  the  three  and  six  month  periods  ended  December  31,  1993,
respectively,  as compared with the  same periods a year  ago, due to the higher
average short-term  borrowings  outstanding and  to  a reduction  in  short-term
investments.

    RSi's  effective tax rates were 38.3% and  37.6% for the three and six month
periods ended December 31, 1993, as compared with 38.0% and 37.5%, respectively,
for the same  periods a  year ago. The  differences in  rates primarily  reflect
changes in the mix of state taxable income.

    RSi  implemented SFAS 109 (accounting for income taxes) in the quarter ended
September 30, 1993,  which resulted  in a  favorable $377,000  ($.05 per  share)
one-time adjustment to earnings.

    Earnings  per share before the cumulative effect adjustment declined by $.11
and $.18  for  the  three  and  six  month  periods  ended  December  31,  1993,
respectively, as compared with the same periods in the previous fiscal year, due
predominantly to the lower net earnings.

    In  the quarter ended December 31, 1993, RSi received notice that a military
radar equipment  subcontract valued  at  $6.2 million  had been  terminated  for
convenience  by the U.S. Government. At December  31, 1993, RSi had a backlog of
$133.1 million, of which  approximately $38.2 million  is unfunded. Included  in
the   unfunded  backlog  is  an  $18   million  subcontract  (subject  to  final
negotiations) for a satellite earth station  project in Kuwait. The Company  was
notified  by its Kuwait-based  prime contractor in December  1993 that the prime
contractor had been selected  by the Kuwait Ministry  of Communications for  the
project.

    As a result of longer than expected delays in the potential award of certain
commercial  satellite antenna  contracts, RSi's  results for  the three  and six
month periods ended December 31, 1993, were lower than planned. Although RSi  is
aggressively  pursuing expansion into  the international systems  market, in the
short term, RSi's recent entry into this  market and the size, the intensity  of
the competition and the uncertainties faced in negotiating complex multi-million
dollar  agreements with foreign governments or their licensed telecommunications
operators may  affect  the  revenues  and earnings  derived  from  such  market.
Consequently,  management  is  continuing to  seek  market share  growth  and to
maintain strong  expense  controls  to  ensure  profitable  performance  in  its
traditional core markets.

IMPACT OF INFLATION

    Management believes that, due to the nature of RSi's products and contracts,
the   cumulative  effects  of  inflation  do  not  have  a  material  impact  on
profitability.

CASH FLOW, LIQUIDITY, AND CAPITAL RESOURCES

    RSi continues to maintain a good  liquidity position. At December 31,  1993,
RSi's  cash and short-term investment balances  totaled $8.7 million and working
capital totaled $69.7 million (current ratio of 3.7:1). At June 30, 1993,  RSi's
cash   and  short-term  investment  balances   were  approximately  $8  million,
representing a decrease of $4.3  million from the level  a year ago. Cash  flows
were  favorably impacted in the first half of  fiscal year 1994 as a result of a
$5.5 million insurance receipt, which included $2.83 million for RSi's  business
interruption  insurance claim through September 30,  1993, and $2.67 million for
partial settlement of  its property claim.  RSi used the  insurance proceeds  to
retire the $3 million short-term bank note payable which was outstanding at June
30,  1993, and to acquire for  $1.8 million additional manufacturing and storage
capacity in Virginia, near its  corporate headquarters. Excluding the effect  of
the  business interruption insurance receipt, cash  flows from operations in the
first half of fiscal  year 1994 were lower  than in the same  period a year  ago
primarily  as a result of the decline in  sales in the first half of fiscal year
1994 and the increase in unbilled  costs and accrued profits resulting from  the
progress  payment terms  of certain contracts  for that period.  Cash flows from
operations in fiscal year 1993 were lower than in fiscal year 1992 primarily  as
a result of the decline in sales between such years and the increase in unbilled
costs  and accrued profits resulting from  the progress payment terms of certain
contracts for that period.

                                       32
<PAGE>
    The increase in accounts  receivable and inventories  between June 30,  1993
and  June 30, 1992 is  principally due to the  effect of the Anghel Laboratories
acquisition. See  Note  8 to  RSi's  audited financial  statements  included  in
"RADIATION SYSTEMS, INC. CONSOLIDATED FINANCIAL STATEMENTS."

    RSi  increased its  bank line  of credit  facility from  $10 million  to $13
million in  the quarter  ended December  31,  1993, of  which $7.1  million  was
utilized  at December 31, 1993 (including $3.1 million of outstanding letters of
credit). The increased facility  is believed necessary  to compensate for  RSi's
reduction  in  U.S. Government  contracts in  the  short-term and  the projected
increase  in  commercial  business.  See  Note  4  to  RSi's  audited  financial
statements   included  in   "RADIATION  SYSTEMS,   INC.  CONSOLIDATED  FINANCIAL
STATEMENTS" for additional information regarding RSi's credit facilities at June
30, 1993.

    RSi is not aware of  any demands or commitments that  are likely to have  an
adverse  effect on  RSi's liquidity position,  and RSi  believes that internally
generated funds and other available funding  sources are adequate to meet  RSi's
requirements.

RECENT DEVELOPMENTS

    On  April 26, 1994,  RSi reported revenues  for the quarter  ended March 31,
1994 of $31.0 million  compared to $28.4 million  for the comparable quarter  of
fiscal  year 1993. Net income was $1.9 million  or $0.22 per share, a decline of
25% from  net income  of $2.5  million or  $0.30 per  share for  the  comparable
quarter  of fiscal  year 1993.  For the  nine months  ended March  31, 1994, net
income was  $5.6  million or  $0.67  per share  on  revenues of  $84.8  million,
compared  to net income of $7.3 million or  $0.88 per share on revenues of $90.2
million for the comparable period in the prior fiscal year.

                 COMSAT CORPORATION AND RADIATION SYSTEMS, INC.
          UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS

    The following unaudited  pro forma combined  condensed financial  statements
give  effect to the Merger under the  pooling of interests method of accounting.
The unaudited pro  forma combined condensed  balance sheet gives  effect to  the
Merger  as if it had been consummated as of December 31, 1993. The unaudited pro
forma combined condensed income statements for each of the years ended  December
31,  1993, 1992 and 1991 give effect to the  Merger as if it had occurred at the
beginning of the earliest period presented. The pro forma data are presented for
illustrative purposes only and are  not necessarily indicative of the  financial
position  or operating results that would have  occurred or that will occur upon
consummation of the Merger. These pro  forma statements have been prepared  from
the historical consolidated financial statements of COMSAT and RSi and should be
read  in conjunction with  such historical financial  statements and the related
notes incorporated  by  reference  or included  herein.  See  "INCORPORATION  OF
CERTAIN  DOCUMENTS  BY  REFERENCE"  and  "RADIATION  SYSTEMS,  INC. CONSOLIDATED
FINANCIAL STATEMENTS."

                                       33
<PAGE>
                 COMSAT CORPORATION AND RADIATION SYSTEMS, INC.
              UNAUDITED PRO FORMA COMBINED CONDENSED BALANCE SHEET
                               DECEMBER 31, 1993
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                                        PRO FORMA        PRO FORMA
                                                             COMSAT        RSI         ADJUSTMENTS       COMBINED
                                                          ------------  ----------  -----------------  -------------
<S>                                                       <C>           <C>         <C>                <C>
ASSETS
Current Assets:
  Cash and Cash Equivalents.............................  $      8,794  $    7,436  $                   $    16,230
  Receivables...........................................       143,347      66,835                          210,182
  Other.................................................        26,341      21,629                           47,970
                                                          ------------  ----------  -----------------  -------------
  Total Current Assets..................................       178,482      95,900         --               274,382
                                                          ------------  ----------  -----------------  -------------
Property and Equipment, net.............................     1,308,167      24,265                        1,332,432
Goodwill and Franchise Rights...........................        71,862       5,179                           77,041
Other Assets............................................        94,004       1,188       (5,098)(2c)         90,094
                                                          ------------  ----------  -----------------  -------------
  Total Assets..........................................  $  1,652,515  $  126,532  $    (5,098)        $ 1,773,949
                                                          ------------  ----------  -----------------  -------------
                                                          ------------  ----------  -----------------  -------------
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
  Current Maturities of Long-Term Obligations...........  $     74,904  $    2,011  $                   $    76,915
  Current Notes Payable.................................        43,233       4,000                           47,233
  Accounts Payable and Accrued Liabilities..............        97,329      19,247        5,000 (1a         121,576
  Due to Related Parties................................        56,601      --                               56,601
  Other Current Liabilities.............................         5,773         976                            6,749
                                                          ------------  ----------  -----------------  -------------
  Total Current Liabilities.............................       277,840      26,234        5,000             309,074
                                                          ------------  ----------  -----------------  -------------
Long-Term Debt..........................................       402,402       8,148                          410,550
Deferred Income Taxes and Investment Tax Credits........       102,141       1,478                          103,619
Accrued Postretirement Benefit Costs....................        50,014      --                               50,014
Other Long-Term Liabilities.............................       119,393       1,486                          120,879
Minority Interest.......................................        21,373      --                               21,373
Stockholders' Equity:
  Common Stock..........................................       281,371       8,757       13,216 (2c,d       303,344
  Other Paid-In Capital.................................       --           21,378      (21,378)(2c,d)      --
  Retained Earnings.....................................       421,833      66,257       (5,000)(1a)        483,090
  Treasury Stock........................................       (13,311)     (3,064)       3,064 (2d         (13,311)
  Other.................................................       (10,541)     (4,142)          --             (14,683)
                                                          ------------  ----------  -----------------  -------------
  Total Stockholders' Equity............................       679,352      89,186      (10,098)            758,440
                                                          ------------  ----------  -----------------  -------------
  Total Liabilities and Stockholders' Equity............  $  1,652,515  $  126,532  $    (5,098)        $ 1,773,949
                                                          ------------  ----------  -----------------  -------------
                                                          ------------  ----------  -----------------  -------------
</TABLE>

   See the accompanying notes to these unaudited pro forma combined condensed
                             financial statements.

                                       34
<PAGE>
                 COMSAT CORPORATION AND RADIATION SYSTEMS, INC.
            UNAUDITED PRO FORMA COMBINED CONDENSED INCOME STATEMENT
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                   YEAR ENDED DECEMBER 31, 1993
                                                                   -----------------------------
                                                                                       PRO FORMA
                                                                    COMSAT     RSI     COMBINED
                                                                   --------  --------  ---------
<S>                                                                <C>       <C>       <C>
Revenues.........................................................  $640,390  $113,895  $754,285
                                                                   --------  --------  ---------
Operating Expenses:
  Cost of Services...............................................   328,727    94,746   423,473
  Depreciation and Amortization..................................   138,359     3,752   142,111
  Research and Development.......................................    13,387     1,915    15,302
  General and Administrative.....................................    21,819     --       21,819
                                                                   --------  --------  ---------
    Total Operating Expenses.....................................   502,292   100,413   602,705
                                                                   --------  --------  ---------
Operating Income.................................................   138,098    13,482   151,580
Other Income (Expense), net......................................     9,307       458     9,765
Interest Expense, net of amount capitalized......................   (22,920)     (764) (23,684)
                                                                   --------  --------  ---------
Income Before Taxes and Cumulative Effect of Accounting Change...   124,485    13,176   137,661
Income Tax Expense...............................................   (50,441)   (4,751) (55,192)
                                                                   --------  --------  ---------
Income Before Cumulative Effect of Accounting Change.............  $ 74,044  $  8,425  $ 82,469
                                                                   --------  --------  ---------
                                                                   --------  --------  ---------
Earnings Per Share Before Cumulative Effect of Accounting Change:
    Primary......................................................  $   1.82  $   1.01  $   1.77 (2b)
                                                                   --------  --------  ---------
                                                                   --------  --------  ---------
    Fully Diluted................................................  $   1.82  $  --     $   1.77 (2b)
                                                                   --------  --------  ---------
                                                                   --------  --------  ---------
  Average Shares Outstanding:
    Primary......................................................    40,708     8,320    46,513
    Fully Diluted................................................    40,770     8,320    46,575
</TABLE>

Note:  Pro forma combined earnings per  share above assume a Conversion Fraction
of .709, which is the average of the minimum and maximum possible values of  the
Conversion  Fraction. The pro forma combined  primary and fully diluted earnings
per share assuming the minimum Conversion Fraction of .638 are $1.80 and  $1.79,
respectively,  and the average shares  outstanding are 45,932,000 and 45,994,000
respectively. The  pro forma  combined primary  and fully  diluted earnings  per
share  assuming the maximum Conversion  Fraction of .780 is  $1.75 for both, and
the average shares outstanding are 47,095,000 and 47,157,000 respectively.

   See the accompanying notes to these unaudited pro forma combined condensed
                             financial statements.

                                       35
<PAGE>
                 COMSAT CORPORATION AND RADIATION SYSTEMS, INC.
            UNAUDITED PRO FORMA COMBINED CONDENSED INCOME STATEMENT
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                   YEAR ENDED DECEMBER 31, 1992
                                                                   -----------------------------
                                                                                       PRO FORMA
                                                                    COMSAT     RSI     COMBINED
                                                                   --------  --------  ---------
<S>                                                                <C>       <C>       <C>
Revenues.........................................................  $563,615  $124,478  $688,093
                                                                   --------  --------  ---------
Operating Expenses:
  Cost of Services...............................................   272,351   102,748   375,099
  Depreciation and Amortization..................................   127,337     3,423   130,760
  Research and Development.......................................    15,293     1,830    17,123
  General and Administrative.....................................    21,168     --       21,168
  Provision for Restructuring....................................    38,961     --       38,961
                                                                   --------  --------  ---------
    Total Operating Expenses.....................................   475,110   108,001   583,111
                                                                   --------  --------  ---------
Operating Income.................................................    88,505    16,477   104,982
Other Income (Expense), net......................................     3,949       643     4,592
Interest Expense, net of amount capitalized......................   (25,691)     (620) (26,311)
                                                                   --------  --------  ---------
Income Before Taxes..............................................    66,763    16,500    83,263
Income Tax Expense...............................................   (23,839)   (6,132) (29,971)
                                                                   --------  --------  ---------
Net Income.......................................................  $ 42,924  $ 10,368  $ 53,292
                                                                   --------  --------  ---------
                                                                   --------  --------  ---------
Earnings Per Share:
    Primary......................................................  $   1.09  $   1.24  $   1.18 (2b)
                                                                   --------  --------  ---------
                                                                   --------  --------  ---------
    Fully Diluted................................................  $   1.09  $  --     $   1.17 (2b)
                                                                   --------  --------  ---------
                                                                   --------  --------  ---------
Average Shares Outstanding:
    Primary......................................................    39,347     8,370    45,281
    Fully Diluted................................................    40,763     8,370    46,697
</TABLE>

Note: Pro forma combined earnings per  share above assume a Conversion  Fraction
of  .709, which is the average of the minimum and maximum possible values of the
Conversion Fraction. The pro forma  combined primary and fully diluted  earnings
per  share assuming the minimum  Conversion Fraction of .638  is $1.19 for both,
and the average shares outstanding  are 44,687,000 and 46,103,000  respectively.
The pro forma combined primary and fully diluted earnings per share assuming the
maximum  Conversion Fraction of .780  is $1.16 for both,  and the average shares
outstanding are 45,875,000 and 47,291,000 respectively.

   See the accompanying notes to these unaudited pro forma combined condensed
                             financial statements.

                                       36
<PAGE>
                 COMSAT CORPORATION AND RADIATION SYSTEMS, INC.
            UNAUDITED PRO FORMA COMBINED CONDENSED INCOME STATEMENT
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                   YEAR ENDED DECEMBER 31, 1991
                                                                   -----------------------------
                                                                                       PRO FORMA
                                                                    COMSAT     RSI     COMBINED
                                                                   --------  --------  ---------
<S>                                                                <C>       <C>       <C>
Revenues.........................................................  $522,850  $128,361  $651,211
                                                                   --------  --------  ---------
Operating Expenses:
  Cost of Services...............................................   245,187   108,946   354,133
  Depreciation and Amortization..................................   110,260     3,058   113,318
  Research and Development.......................................    17,548     1,118    18,666
  General and Administrative.....................................    22,382     --       22,382
                                                                   --------  --------  ---------
    Total Operating Expenses.....................................   395,377   113,122   508,499
                                                                   --------  --------  ---------
Operating Income.................................................   127,473    15,239   142,712
Other Income (Expense), net......................................    (4,766)      551   (4,215)
Interest Expense, net of amount capitalized......................   (19,634)     (297) (19,931)
                                                                   --------  --------  ---------
Income Before Taxes and Cumulative Effect of Accounting Change...   103,073    15,493   118,566
Income Tax Expense...............................................   (31,649)   (5,903) (37,552)
                                                                   --------  --------  ---------
Income Before Cumulative Effect of Accounting Change.............  $ 71,424  $  9,590  $ 81,014
                                                                   --------  --------  ---------
                                                                   --------  --------  ---------
Earnings Per Share Before Cumulative Effect of Accounting Change:
    Primary......................................................  $   1.88  $   1.15  $   1.84 (2b)
                                                                   --------  --------  ---------
                                                                   --------  --------  ---------
    Fully Diluted................................................  $   1.80  $  --     $   1.78 (2b)
                                                                   --------  --------  ---------
                                                                   --------  --------  ---------
  Average Shares Outstanding:
    Primary......................................................    38,069     8,317    43,965
    Fully Diluted................................................    42,767     8,317    48,663
</TABLE>

Note: Pro forma combined earnings per  share above assume a Conversion  Fraction
of  .709, which is the average of the minimum and maximum possible values of the
Conversion Fraction. The pro forma  combined primary and fully diluted  earnings
per  share assuming the minimum Conversion Fraction of .638 are $1.87 and $1.80,
respectively, and the average shares  outstanding are 43,375,000 and  48,073,000
respectively.  The pro  forma combined  primary and  fully diluted  earnings per
share assuming the  maximum Conversion  Fraction of  .780 are  $1.82 and  $1.75,
respectively,  and the average shares  outstanding are 44,556,000 and 49,254,000
respectively.

   See the accompanying notes to these unaudited pro forma combined condensed
                             financial statements.

                                       37
<PAGE>
                 COMSAT CORPORATION AND RADIATION SYSTEMS, INC.
                NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED
                              FINANCIAL STATEMENTS

1.  BASIS OF PRESENTATION

    (a) The  accompanying  unaudited  pro  forma  combined  condensed  financial
statements  are presented for illustrative purposes  only and do not give effect
to any synergies which are expected to occur due to the combination of  COMSAT's
and  RSi's operations. The  pro forma combined  condensed balance sheet includes
estimated  transaction  costs  of   the  Merger  of  approximately   $5,000,000.
Transaction  costs  include  legal,  investment  banking,  accounting  and other
related expenses which may  not be currently tax  deductible. Therefore, no  tax
effect  has been assumed for these items. All  of these costs are expected to be
charged against  income  of  the  combined  company  upon  closing  the  Merger.
Accordingly, the effects of these costs have not been reflected in the pro forma
combined condensed income statements. The pro forma combined condensed financial
statements   exclude  the  nonrecurring  costs   and  expenses  associated  with
integrating the operations of the  combined companies. The costs of  integrating
operations  are expected to  result in significant,  nonrecurring charges to the
combined companies'  results of  operations after  consummation of  the  Merger;
however, the actual amount of such charges cannot be determined at this time.

    Pursuant  to the rules  and regulations of  the SEC, the  pro forma combined
condensed statements  of income  exclude the  cumulative effects  of  accounting
changes.

    (b)  COMSAT operates and reports  on a December 31  calendar year basis. RSi
operates and reports  on a June  30 fiscal  year basis. The  pro forma  combined
income  statement data  combines the income  statements of COMSAT  for the years
ended December 31, 1993, 1992 and 1991 with the income statements of RSi for the
years ended December 31,  1993, 1992 and 1991,  respectively. The calendar  year
income  statements for RSi were derived by  adding the income statements for the
third and fourth quarters of each fiscal year with the first and second quarters
of the  subsequent  fiscal year.  The  pro  forma combined  balance  sheet  data
combines  the balance sheet of  COMSAT as of December  31, 1993 with the balance
sheet of RSi as of December 31, 1993.

2.  PRO FORMA ADJUSTMENTS

    (a) Under the  Merger Agreement between  COMSAT and RSi,  each share of  RSi
Common Stock will be exchanged for no less than .638 and no more than .780 share
of COMSAT Common Stock.

    (b)  Primary earnings  per share  were computed  using the  combined average
shares outstanding during  each period, adjusted  for outstanding stock  options
and  restricted stock units. Fully diluted earnings  per share for 1991 and 1992
assume the conversion of COMSAT's convertible debentures, which were redeemed in
March 1992.

    (c) As of December 31, 1993, COMSAT owned 404,500 shares of RSi Common Stock
with a total cost to COMSAT of $5,098,000. The pro forma combined balance  sheet
includes   an  adjustment  to  reflect  the  retirement  of  these  shares  upon
consummation of the Merger.

    (d) The pro forma  combined balance sheet as  of December 31, 1993  reflects
the  issuance of COMSAT Common  Stock in exchange for  all outstanding shares of
RSi Common Stock (excluding those shares  held by COMSAT). Assuming the  average
Conversion  Fraction of .709,  5,587,000 shares of COMSAT  Common Stock would be
issued for all  outstanding shares  of RSi  Common Stock;  assuming the  minimum
Conversion  Fraction of .638,  5,028,000 shares of COMSAT  Common Stock would be
issued for all outstanding shares of RSi Common Stock; and assuming the  maximum
Conversion   Fraction  of  .780,  6,147,000  shares  would  be  issued  for  all
outstanding shares of RSi  Common Stock. The pro  forma combined equity  account
balances remain the same regardless of the Conversion Fraction.

    (e)  There  are  no  significant intercompany  revenues  and  no significant
adjustments required to be made to the historical financial statements of COMSAT
and RSi to arrive at the pro forma combined balance

                                       38
<PAGE>
                 COMSAT CORPORATION AND RADIATION SYSTEMS, INC.
                NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED
                              FINANCIAL STATEMENTS

2.  PRO FORMA ADJUSTMENTS (CONTINUED)
sheet and pro  forma combined  income statements  for the  pooling of  interests
except for the pro forma adjustments to the balance sheet indicated in note 2(c)
above.  Certain  reclassifications have  been made  to make  classifications for
similar items consistent between companies on a pro forma combined basis.

3.  NOTES TO HISTORICAL FINANCIALS

    (a) COMSAT's operating results include a restructuring charge of $38,961,000
in 1992.

    (b) RSi's  revenues  include  business interruption  insurance  proceeds  of
$3,021,000 in 1993, $1,572,000 in 1992 and $536,000 in 1991.

    (c) Per share amounts have been adjusted for a two-for-one split of COMSAT's
stock in 1993 and a three-for-two split of RSi's stock in 1991.

                                       39
<PAGE>
                         COMPARATIVE MARKET PRICE DATA

    The  COMSAT Common Stock is  listed on the NYSE,  the Chicago Stock Exchange
and the  Pacific  Stock  Exchange.  The  RSi  Common  Stock  is  listed  on  the
NASDAQ/NMS.

    The  table  below  sets  forth, for  the  calendar  quarters  indicated, the
reported high  and low  sale  prices of  the COMSAT  Common  Stock on  the  NYSE
Composite  Tape, and  of the RSi  Common Stock  on the NASDAQ/NMS,  in each case
based on published financial sources, and  the dividends declared on each  share
of COMSAT Common Stock and RSi Common Stock.

<TABLE>
<CAPTION>
                                                           COMSAT
                                                       COMMON STOCK*            RSI COMMON STOCK
                                                  ------------------------  ------------------------
                                                   HIGH    LOW    DIVIDEND   HIGH    LOW    DIVIDEND
                                                  ------  ------  --------  ------  ------  --------
<S>                                               <C>     <C>     <C>       <C>     <C>     <C>
CALENDAR YEAR 1992
  First Quarter.................................  21 1/2  17 1/8     .175   19 3/4      16     .035
  Second Quarter................................  21 1/4  18 3/4     .175   17 1/2  10 1/2    --
  Third Quarter.................................  21 5/8  19 5/8     .175       15   9 3/8      .05
  Fourth Quarter................................  24 1/2  19 7/8     .175   13 3/4  10 3/4    --
CALENDAR YEAR 1993
  First Quarter.................................  27 7/8  23 3/4     .185   15 1/2  12 1/4      .05
  Second Quarter................................  31 5/8  27 1/4     .185   13 3/4  10 3/4    --
  Third Quarter.................................  31 7/8  26 3/4     .185   17 1/4  11 1/2      .05
  Fourth Quarter................................  35 1/4  27 1/2     .185   16 1/4  13 1/4    --
CALENDAR YEAR 1994
  First Quarter.................................      30  24 7/8     .185   18 1/8  13 1/4      .05
  Second Quarter (through May 2, 1994)..........  26 1/2  21 1/8     .185   17 3/4  16 1/8    --
<FN>
- ------------------------
*COMSAT's data reflect the two-for-one stock split which occurred in June 1993.
</TABLE>

    The  Conversion Fraction will increase or  decrease depending on the average
closing price of COMSAT Common  Stock on the NYSE  Composite Tape during the  20
trading  days ending  five trading days  prior to  the date of  the Closing (the
"Average Price"). In addition,  because the Merger  Agreement provides that  the
Conversion  Fraction shall not be  less than .638 and  shall not be greater than
.780, if  market fluctuations  would  otherwise have  resulted in  a  Conversion
Fraction outside such range, the value of the shares of COMSAT Common Stock that
holders  of RSi Common  Stock will receive in  the Merger could  be more or less
than the value of the COMSAT Common Stock such holders would receive absent  any
limitation  on the  range of  the Conversion Fraction.  If the  Average Price is
between $23.40 and  $28.60, the  Conversion Fraction  will be  between .780  and
.638.  If the Average Price  is $23.40 or less,  the Conversion Fraction will be
fixed at  .780.  If the  Average  Price is  $28.60  or greater,  the  Conversion
Fraction  will be fixed at  .638. THE AVERAGE PRICE  WILL BE DETERMINED, AND THE
CONVERSION FRACTION WILL BE FIXED,  FIVE TRADING DAYS PRIOR  TO THE DATE OF  THE
CLOSING,  WHICH RSI AND COMSAT  ANTICIPATE WILL OCCUR ON  THE DAY OF THE SPECIAL
MEETING. RSI STOCKHOLDERS ARE URGED TO OBTAIN CURRENT MARKET QUOTATIONS FOR  THE
COMSAT COMMON STOCK AND THE RSI COMMON STOCK BEFORE DECIDING HOW TO VOTE.

    On  January  28,  1994, the  trading  day  immediately prior  to  the public
announcement of the Merger, the closing price of a share of COMSAT Common  Stock
on  the NYSE Composite Tape was $26 7/8, and the closing price of a share of RSi
Common Stock on the NASDAQ/NMS  was $13 1/2. If the  Average Price on that  date
had been equal to the closing price of the COMSAT Common Stock on that date, the
Conversion Fraction on that date would have been .679.

    On May 2, 1994, the last practicable date prior to the mailing of this Proxy
Statement/Prospectus, the closing price of a share of COMSAT Common Stock on the
NYSE  Composite Tape was $21 3/8, and the closing price of a share of RSi Common
Stock on the NASDAQ/NMS was $16 1/8. If the Average Price on that date had  been
equal  to  the  closing price  of  the COMSAT  Common  Stock on  that  date, the
Conversion Fraction on that date would have been .780.

                                       40
<PAGE>
                      DESCRIPTION OF COMSAT CAPITAL STOCK

    The following  is a  brief description  of the  capital stock  of COMSAT  as
provided for in the COMSAT Articles and the Satellite Act. This description does
not  purport to be complete and is qualified in its entirety by reference to the
full text of the  COMSAT Articles and the  relevant provisions of the  Satellite
Act,  each of which  is an exhibit  to the Registration  Statement of which this
Proxy Statement/Prospectus is a part.

    The Satellite Act and the COMSAT Articles create a number of restrictions on
the rights of holders of COMSAT capital stock. The limitations contained in  the
COMSAT  Articles and the Satellite Act are relevant in the context of the Merger
because they may restrict the ability of COMSAT to issue shares of COMSAT Common
Stock to certain persons in connection with the Merger, and may limit the rights
of certain shareholders to own, transfer and vote shares of COMSAT Common Stock.

    The COMSAT Articles currently authorize  the issuance of 105,000,000  shares
of  capital stock,  including 5,000,000 shares  of preferred  stock, without par
value ("COMSAT  Preferred  Stock"),  and 100,000,000  shares  of  common  stock,
without  par value.  As of  March 31, 1994,  40,363,294 shares  of COMSAT Common
Stock were outstanding.  As of that  date, no shares  of COMSAT Preferred  Stock
were issued or outstanding.

GENERAL

    The Satellite Act and the COMSAT Articles impose three major restrictions on
the  ownership, transfer  and voting  of shares  of COMSAT  capital stock. Since
holders of RSi Common Stock will become holders of COMSAT Common Stock after the
Effective Date, these restrictions will  apply to their ownership, transfer  and
voting of such shares. Accordingly, the following summary and description should
be read carefully.

        COMMON  CARRIERS.  The Satellite Act provides that only those Common
    Carriers (as defined below) which  are specifically authorized or  which
    are  members of a class of carriers  authorized by the FCC to own COMSAT
    Common Stock ("Authorized  Carriers") may own  shares of COMSAT  capital
    stock,  and at  no time shall  Authorized Carriers own  in the aggregate
    more than 50 percent of the capital stock of COMSAT. See "--  Provisions
    Pertaining  to Common Carriers." The Satellite Act provides further that
    Common Carriers as a  group are entitled  to elect directors  separately
    from  the other shareholders when Common  Carriers own or hold more than
    eight percent of the capital stock. The number of directors that  Common
    Carriers  are entitled to elect is specified by formula in the Satellite
    Act. See  "-- Voting  Rights; Election  of Directors."  Common  Carriers
    currently  own or hold less than eight percent of the capital stock. The
    COMSAT Articles designate shares of COMSAT Common Stock held by  persons
    other than Common Carriers as Series I shares and shares of Common Stock
    held by Common Carriers as Series II shares. See "-- Common Stock."

        ALIEN  PERSONS.  The  Satellite Act provides  that Alien Persons (as
    defined below) may not own or hold more than 20 percent of the aggregate
    number of outstanding  shares of  COMSAT capital stock  held by  persons
    other  than  Common  Carriers.  See "--  Restrictions  of  Ownership and
    Transfer of Shares."

        HOLDINGS  BY  ANY  PERSON,  SYNDICATE  OR  AFFILIATED  GROUP.    The
    Satellite  Act provides that no person, syndicate or affiliated group of
    such persons (other than a Common Carrier) may own or hold more than  10
    percent  of the aggregate number of outstanding shares of COMSAT capital
    stock. Pursuant  to  authority contained  in  the COMSAT  Articles,  the
    COMSAT  Board may  determine by resolution  that such  percentage may be
    less than 10 percent. The COMSAT Board has determined that the ownership
    limitation shall  be  10  percent,  but that  no  person,  syndicate  or
    affiliated  group of such persons (other than a Common Carrier) may vote
    shares held  in  excess of  five  percent  of the  aggregate  number  of
    outstanding  shares  of COMSAT  capital stock.  See "--  Restrictions on
    Ownership and Transfer  of Shares"  and "-- Voting  Rights; Election  of
    Directors."

                                       41
<PAGE>
COMMON STOCK

    All  shares of COMSAT Common Stock are  designated by the COMSAT Articles as
either Series I or Series II shares  depending upon the character of the  holder
of  such shares. Shares of COMSAT Common  Stock issued or transferred to persons
other than Common Carriers are designated  Series I shares ("Series I  shares").
"Common  Carrier" means  (i) any person  (other than COMSAT)  engaged within the
United  States  as  a  common  carrier  for  hire,  in  interstate  or   foreign
communications  by wire or radio or  in interstate or foreign radio transmission
of energy,  including  a person  so  engaged through  physical  connections,  or
connections  by radio,  or by  wire and  radio, with  the facilities  of another
carrier; or (ii) any person which  owns or controls, directly or indirectly,  or
is  under direct  or indirect  common control  with, any  such person.  A person
engaged in radio  broadcasting is not,  insofar as  so engaged, deemed  to be  a
Common  Carrier.  Shares  of  COMSAT  Common  Stock  issued  or  transferred  to
Authorized Carriers are designated Series II shares ("Series II shares"). Except
as described below, the rights of a holder of Series I shares and the rights  of
a holder of Series II shares are the same. Accordingly, subject to the rights of
the  holders of  COMSAT Preferred  Stock, if any,  all holders  of COMSAT Common
Stock are entitled to receive  such dividends as may  be declared by the  COMSAT
Board   out  of  funds   legally  available  therefor.   Upon  any  liquidation,
dissolution, or winding up of  COMSAT, subject to the  rights of the holders  of
COMSAT Preferred Stock, if any, all holders of shares of COMSAT Common Stock are
entitled  to receive, pro rata, the assets of COMSAT available for distribution.
No conversion rights, preemptive rights  or redemption rights are applicable  to
shares of COMSAT Common Stock.

    The  total number of Series I shares  and Series II shares outstanding as of
March 31, 1994 was 40,342,406 shares and 20,888 shares, respectively. Series  II
shares  constituted less than 0.1  percent of the outstanding  shares as of such
date.

PREFERRED STOCK

    The COMSAT Articles provide that the COMSAT Preferred Stock, if issued,  (i)
shall  have voting rights  equivalent to the  Series I shares,  (ii) may only be
held by persons  who are not  Common Carriers or  subsidiaries or affiliates  of
Common  Carriers  or  are  not  trustees  or  directors  of  Common  Carriers or
subsidiaries or affiliates of  Common Carriers, (iii)  shall be aggregated  with
the  Series I shares in determining  compliance with the restrictions on foreign
ownership, (iv)  shall be  aggregated  with shares  of  COMSAT Common  Stock  in
determining the number of outstanding shares and compliance with the restriction
on the amount of COMSAT's capital stock that may be held by non-Common Carriers,
(v)  if entitled to  dividends, shall be entitled  to cumulative dividends, (vi)
shall have no preemptive rights, and (vii) with respect to shares of any  series
of  COMSAT Preferred Stock, may, if so  determined by the Board of Directors, be
convertible into shares  of another  class of  COMSAT capital  stock or  another
series of COMSAT Preferred Stock.

    No  dividends may be declared or paid on any COMSAT Common Stock nor, except
in limited  cases, may  any COMSAT  Common  Stock be  purchased or  redeemed  by
COMSAT,  unless all dividends on all series of COMSAT Preferred Stock shall have
been paid or declared and a sum sufficient for the payment thereof set aside. In
the event of any  liquidation, dissolution or winding  up of COMSAT, before  any
payment  is  made to  holders  of COMSAT  Common  Stock, the  holders  of COMSAT
Preferred Stock  shall  be  entitled  to  be  paid  in  full  their  liquidation
preference  as fixed in the resolutions of  the COMSAT Board issuing such stock,
together with accrued dividends.

    The COMSAT Articles provide that the  COMSAT Board shall have the  authority
to fix the relative rights and preferences of the shares of any series of COMSAT
Preferred Stock generally as follows: (i) the serial designation of such series,
(ii)  the number of shares  included in such series,  (iii) the dividend rate of
the series, (iv)  the date  from which dividends  shall be  cumulative, (v)  the
liquidation  preference  of  the series,  (vi)  the provisions  relating  to the
redemption of shares of  the series, (vii) the  obligations to create a  sinking
fund  to purchase  or redeem  shares, (viii)  the conversion  privileges of such
shares into any  other class  of COMSAT  capital stock  or any  other series  of
COMSAT  Preferred Stock, and  (ix) any other relative  rights or preferences not
inconsistent with the COMSAT Articles or applicable law.

                                       42
<PAGE>
RESTRICTIONS ON OWNERSHIP AND TRANSFER OF SHARES

    As indicated above, the  ownership and transfer of  shares of COMSAT  Common
Stock  and  COMSAT  Preferred Stock  are  subject  to a  number  of limitations,
including the following: (i) not more than 20 percent of the aggregate number of
outstanding shares of  COMSAT Common Stock  (held by persons  other than  Common
Carriers) and of COMSAT Preferred Stock may be held by Alien Persons (as defined
below), and (ii) not more than 10 percent of the aggregate number of outstanding
shares  of COMSAT Common Stock and of COMSAT  Preferred Stock may be held by any
person, syndicate or affiliated group of persons (other than a Common  Carrier).
Subject to these limitations (as more fully described below), a holder of shares
of  COMSAT Common Stock or COMSAT Preferred Stock may at any time transfer, sell
or otherwise dispose  of such  shares to  any person  to whom  shares of  either
series of COMSAT Common Stock or of COMSAT Preferred Stock, respectively, may be
issued,  and,  upon  surrender  of  the  share  certificate  for  transfer,  the
transferee will receive a certificate, representing the same number of shares as
the surrendered certificate, for shares of the appropriate class or series.

    For purposes  of the  limitation  described above,  "Alien Person"  means  a
person who is, as to the United States:

    (a) an alien or the representative of any alien;

    (b) a foreign government or the representative thereof;

    (c) a corporation organized under the laws of any foreign government;

    (d)  a corporation of which any officer or  director is an alien or of which
more than one-fifth of the capital stock  is owned of record or voted by  aliens
or their representatives or by a foreign government or representative thereof or
by any corporation organized under the laws of a foreign country; or

    (e)   any  corporation  directly  or  indirectly  controlled  by  any  other
corporation of which any  officer or more than  one-fourth of the directors  are
aliens, or of which more than one-fourth of the capital stock is owned of record
or  voted  by  aliens, their  representatives,  or  by a  foreign  government or
representative thereof, or  by any  corporation organized  under the  laws of  a
foreign country.

    The  Satellite Act provides that the  maximum aggregate percentage of COMSAT
Common Stock  and COMSAT  Preferred Stock  that may  be held  by any  person  or
syndicate or affiliated group of persons (other than a Common Carrier) shall not
exceed  10 percent;  the COMSAT Articles  provide that such  percentage shall be
determined from time to time by the  COMSAT Board (but, in any event, shall  not
be  greater than 10  percent). Pursuant to authority  contained in the Satellite
Act and the COMSAT Articles, the COMSAT Board has determined by resolution  that
the aggregate number of shares of COMSAT Common Stock and COMSAT Preferred Stock
owned  or held by  any person or  syndicate or affiliated  group of such persons
(other than a Common Carrier) may not at any time exceed 10 percent of the total
number of  outstanding shares  of  COMSAT capital  stock,  but that  no  person,
syndicate  or affiliated group of such persons (other than a Common Carrier) may
vote shares  held  in  excess  of  five  percent  of  the  aggregate  number  of
outstanding  shares of  COMSAT capital stock.  Notice of a  determination by the
COMSAT Board changing the  maximum percentage must be  mailed to each holder  of
record  of COMSAT capital stock not less  than 10 days before the effective date
of such determination.  Any reduction  from the maximum  will not  apply to  the
ownership   of  shares   acquired  before  the   effective  date   of  any  such
determination.

    Certain other limitations apply to the  ownership and holding of shares  by,
and  the  transfer of  shares by  and  to, Common  Carriers. See  "-- Provisions
Pertaining to Common Carriers."

    The COMSAT Board is authorized to  establish procedures with respect to  the
issuance  or  transfer  of  shares  of  COMSAT  capital  stock  to  enforce  the
limitations referred  to  above.  Procedures established  by  the  COMSAT  Board
require that, in connection with each issuance or transfer of shares on the book
of  COMSAT, the transferee  complete an application for  transfer of the shares.
Such application calls for information about the transferee's citizenship status
and relationship  with  Common  Carriers.  The COMSAT  Board  may  deem  certain
transferees automatically to have a particular status, such as Series I domestic
or  Series I  foreign, without requiring  the completion of  an application with
respect to each transfer.

                                       43
<PAGE>
    Neither the  Satellite Act  nor the  COMSAT Articles  define the  respective
rights  of the  seller and  purchaser of shares  of COMSAT  capital stock where,
because of the restrictions  on the ownership and  transfer of such shares,  the
purchaser  is not entitled to  have the shares transferred to  him or her on the
books of COMSAT. The  respective rights of  the seller and  purchaser in such  a
case  would be  determined under  the law  applicable to  such sale.  The COMSAT
Articles provide, however, that nothing  in the provisions thereof limiting  the
ownership  and transfer  of shares  of COMSAT capital  stock shall  be deemed to
affect the right of the purchaser in such a case to transfer his or her interest
in the shares to any person who,  under the provisions of the Satellite Act  and
the COMSAT Articles, lawfully may acquire such interest.

    At  the close of business on March 31, 1994, to COMSAT's knowledge, based on
information provided by COMSAT's registrar and transfer agent, approximately 0.3
percent of the outstanding Series I shares  were owned by or for the account  of
Alien  Persons. Based on the number of  Series I shares outstanding on March 31,
1994, the alien ownership limitation would  allow a maximum of 8,068,481  shares
of  COMSAT Common Stock to be owned by Alien Persons (9,350,323 shares of COMSAT
Common Stock on a pro forma basis after  giving effect to the issuance of up  to
6,409,210 shares in connection with the Merger, assuming that no such shares are
issued to Alien Persons in the Merger).

PROVISIONS PERTAINING TO COMMON CARRIERS

    Shares  of COMSAT  Common Stock held  by Authorized  Carriers are designated
Series II shares.  Except for an  Authorized Carrier, shares  of COMSAT  capital
stock  may not be owned or held,  directly or indirectly, by any Common Carrier,
or by a subsidiary or  affiliate of any Common  Carrier, nor may COMSAT  capital
stock  be  owned or  held  by a  trustee,  director, or  officer  of any  of the
foregoing, unless (a) such person is serving at the request of COMSAT or one  of
its subsidiaries as a trustee, director, or officer of a Common Carrier, or of a
subsidiary  or affiliate of  such a carrier,  in which COMSAT  or its subsidiary
owns stock or is a creditor or  (b)(i) such person individually is not a  Common
Carrier;  (ii) such  shares are  owned by  such person  free from  any direct or
indirect control of a Common Carrier or of a subsidiary or affiliated company of
a Common  Carrier; and  (iii) such  person is  authorized by  the FCC  to  serve
concurrently  as  a  trustee or  director  of  such Common  Carrier  or  of such
subsidiary or  affiliated company  of a  Common  Carrier and  as a  director  of
COMSAT.  The aggregate number  of shares of  COMSAT Common Stock  owned or held,
directly or indirectly,  by Authorized Carriers  may not at  any time exceed  50
percent  of  the total  number  of shares  of  COMSAT capital  stock  issued and
outstanding. No Authorized Carrier or affiliated group of such carriers may sell
or transfer to persons  other than Authorized Carriers  shares of COMSAT  Common
Stock  totalling, in any  consecutive 12-month period, more  than two percent of
the greatest  number of  Series II  shares issued  and outstanding  at any  time
during  such  period,  except  pursuant  to  a  general  public  offering  or in
conformity with regulations adopted by the COMSAT Board to encourage the  widest
distribution of shares of COMSAT Common Stock to the American public. The FCC is
authorized,  upon application  by any  Authorized Carrier  and after  notice and
hearing, to compel  any other  Authorized Carrier  which owns  shares of  COMSAT
capital   stock  to  transfer   to  the  applicant,   for  fair  and  reasonable
consideration, such number  of shares  as the  FCC determines  will advance  the
public  interest and the purposes of the  Satellite Act. Common Carriers may not
own or hold COMSAT Preferred Stock.

VOTING RIGHTS; ELECTION OF DIRECTORS

    If COMSAT Preferred Stock  is issued, except in  the election of  directors,
the  holders  thereof will  be entitled  to one  vote per  share on  each matter
submitted to a vote at a meeting of shareholders. In the election of  directors,
shares of COMSAT Preferred Stock would be treated in the same manner as Series I
shares, as described below.

    Except  for the election of directors, each  share of COMSAT Common Stock is
entitled to  one vote  on  each matter  submitted  to a  vote  at a  meeting  of
shareholders.  In certain  cases, the  D.C. Act  would require  a proposition to
receive the approval of the  holders of the COMSAT  Common Stock and the  COMSAT
Preferred  Stock voting separately. Such cases include certain amendments to the
COMSAT Articles, mergers or consolidations, and the sale of all or substantially
all of the  assets of COMSAT.  In such  cases, the holders  of COMSAT  Preferred
Stock  could prevent such matters  from being approved, even  if approved by the
holders of COMSAT Common Stock.

                                       44
<PAGE>
    The Satellite  Act  provides that  the  COMSAT  Board shall  consist  of  15
directors,  of whom  three shall  be appointed  by the  President of  the United
States with  the  advice  and consent  of  the  United States  Senate,  and  the
remaining  12 shall be elected by the shareholders. Six of such directors are to
be elected by holders of Series I shares and six by holder of Series II  shares.
However, the Satellite Act provides that if, as of the record date for an annual
meeting  of  shareholders, the  number of  Series II  shares held  by Authorized
Carriers is less than 45 percent of the total number of shares of capital  stock
outstanding, the number of directors holders of Series II shares are entitled to
elect  will decrease and the number of  directors holders of Series I shares are
entitled to elect ("Series  I directors") will increase  in accordance with  the
following table:

<TABLE>
<CAPTION>
    WHEN PROPORTION OF
     SHARES OF ISSUED                           THE NUMBER OF       AND THE NUMBER OF DIRECTORS
     AND OUTSTANDING                           DIRECTORS WHICH       WHICH HOLDERS OF SERIES I
   COMSAT CAPITAL STOCK                          HOLDERS OF                 SHARES AND
     THAT IS OWNED BY                         SERIES II SHARES        COMSAT PREFERRED STOCK
   AUTHORIZED CARRIERS         BUT NOT         ARE ENTITLED TO            ARE ENTITLED TO
      IS LESS THAN:           LESS THAN:       ELECT SHALL BE:            ELECT SHALL BE:
- --------------------------  --------------  ---------------------  -----------------------------
<S>                         <C>             <C>                    <C>
            45  %                   40%                   5                          7
            40  %                   35%                   4                          8
            35  %                   25%                   3                          9
            25  %                   15%                   2                         10
            15  %                    8%                   1                         11
             8  %                 --                      0                         12
</TABLE>

    When Authorized Carriers own less than eight percent of the shares of COMSAT
Common  Stock (as  is currently  the case),  all shareholders  vote together for
directors, and all directors  are considered Series  I directors. The  Satellite
Act  makes no provision for  adjustment of Series I  and Series II directorships
when, between annual  meetings, a change  in the relative  holdings of Series  I
shares  and  Series  II shares  of  COMSAT  Common Stock  and  shares  of COMSAT
Preferred Stock may occur.

    In voting  for  directors,  the  Satellite Act  provides  that  each  COMSAT
shareholder  shall have cumulative  voting rights. Under  cumulative voting, the
holder may cast a number of votes equal to the number of shares held  multiplied
by  the total number of directors  to be elected and may  cast all of such votes
for a  single  candidate  or may  distribute  such  votes among  any  number  of
candidates to be elected. The Satellite Act restricts the voting power of Common
Carriers  by  preventing any  one  such carrier  from  electing more  than three
directors and all Common Carriers in  the aggregate from electing more than  six
directors,  unless, as is  currently the case, all  Common Carriers together own
less than eight percent  of all outstanding shares  of COMSAT capital stock.  In
such  event, all Common  Carriers vote together with  the other shareholders for
the Series I directors.

    No share may be voted on any matter at a meeting of shareholders if, at  the
time  of such meeting, the share is owned  or held in violation of the Satellite
Act or  any regulation  promulgated thereunder  or in  violation of  the  COMSAT
Articles  or any determination  made by the COMSAT  Board thereunder. The COMSAT
Board has determined, pursuant to authority granted in the COMSAT Articles, that
no person, syndicate or  affiliated group of such  persons (other than a  Common
Carrier)  may vote shares held in excess of five percent of the aggregate number
of outstanding shares of  COMSAT capital stock. COMSAT  may, in accordance  with
resolutions  adopted by the COMSAT Board require that a holder of shares furnish
appropriate information in this connection when voting such shares.

    All of the above provisions will apply  to shares of COMSAT Common Stock  to
be issued in connection with the Merger.

OTHER

    Under the provisions of the Satellite Act, COMSAT is authorized to issue, in
addition to shares of COMSAT Common Stock and COMSAT Preferred Stock, non-voting
securities,  bonds, debentures and other certificates  of indebtedness as it may
determine. The Satellite  Act requires FCC  approval to issue  shares of  COMSAT
capital stock, as well as for any borrowing of funds by COMSAT or any assumption
by it of any obligation in respect of the securities of any other person. COMSAT
is currently subject to an FCC-

                                       45
<PAGE>
approved  Capitalization Plan  which includes  parameters requiring  that COMSAT
maintain (i) a long-term debt to total capitalization ratio of not greater  than
45%,  (ii) an interest coverage ratio of 2.3  to 1, and (iii) not more than $200
million in short-term borrowings. Pursuant to the Capitalization Plan, COMSAT is
permitted to  issue equity  securities, including  the shares  of COMSAT  Common
Stock  to be issued  pursuant to, and  in the transactions  contemplated by, the
Merger Agreement, upon  two days'  notice to  the FCC so  long as  COMSAT is  in
compliance with such parameters. See "THE MERGER -- Regulatory Matters."

    The  transfer agent, registrar and dividend  disbursing agent for the COMSAT
Common Stock is The Bank of New York.

    For a  description  of certain  other  provisions contained  in  the  COMSAT
Articles  and the COMSAT  By-Laws, see "COMPARISON OF  RIGHTS OF SHAREHOLDERS OF
RSi AND COMSAT."

                      COMPARISON OF RIGHTS OF SHAREHOLDERS
                               OF RSI AND COMSAT

    If the Merger  is consummated,  stockholders of RSi,  a Nevada  corporation,
will become shareholders of COMSAT, a District of Columbia ("D.C.") corporation,
and  the rights of such shareholders will be governed by applicable Federal law,
including the  Satellite Act  and,  to the  extent not  inconsistent  therewith,
applicable  D.C. law, including the D.C. Act, the COMSAT Articles and the COMSAT
By-Laws. Although  it  is not  practical  to present  a  comparison of  all  the
differences  between the rights of stockholders of RSi under the Nevada Law, the
RSi Articles and the RSi By-Laws and the rights of shareholders of COMSAT  under
the Satellite Act, the D.C. Act, the COMSAT Articles and the COMSAT By-Laws, the
following  is a summary of certain important differences which may significantly
affect the rights of RSi stockholders.

GENERAL

    COMSAT was incorporated  in 1963 under  the D.C. Act,  as authorized by  the
Satellite  Act. Although COMSAT  is a private  (non-government) corporation, the
Satellite Act  includes a  number of  provisions applicable  to the  conduct  of
COMSAT's business and affairs. Some of these provisions govern corporate matters
that  are not ordinarily subject to  U.S. Government supervision or control. For
instance, under  the Satellite  Act, three  of the  15 directors  of COMSAT  are
appointed  by the President of the United  States with the advice and consent of
the United  States Senate;  the issuance  of any  shares of  capital stock,  the
borrowing  of money or the assumption of obligations in respect of securities of
any other  person by  COMSAT  must be  found by  the  FCC to  be in  the  public
interest;  and certain limitations are placed on the classes of persons that may
hold shares of  COMSAT capital stock  and on the  number of shares  a person  or
class  of persons  may hold, as  described under "DESCRIPTION  OF COMSAT CAPITAL
STOCK." In  addition, from  time to  time amendments  to the  Satellite Act  are
proposed which, if enacted, could change the operations and business of COMSAT.

    COMSAT  is not an agency of the U.S. Government. The U.S. Government has not
invested funds in  COMSAT or  guaranteed funds invested  in COMSAT,  nor has  it
guaranteed the payment of dividends by, or the profitability of, COMSAT.

AUTHORIZED CAPITAL STOCK

    Under   the  COMSAT  Articles,  COMSAT  currently  has  authority  to  issue
105,000,000 shares  of  capital stock.  Of  that number,  5,000,000  shares  are
preferred  stock, without  par value, and  100,000,000 shares  are common stock,
without par  value.  For  a  further  description  of  COMSAT's  capital  stock,
including  certain restrictions with respect  to the issuance, holding, transfer
and voting thereof, see "DESCRIPTION OF COMSAT CAPITAL STOCK."

    Under the  RSi Articles,  RSi currently  has authority  to issue  25,000,000
shares of common stock, par value $1.00 per share.

PREFERRED STOCK

    Under  the  COMSAT Articles,  the COMSAT  Board has  the authority  to issue
preferred stock and to fix the relative rights and preferences of the shares  of
any series of COMSAT Preferred Stock generally as

                                       46
<PAGE>
follows:  (i) the serial designation  of such series, (ii)  the number of shares
included in such series, (iii)  the dividend rate of  the series, (iv) the  date
from  which dividends shall be cumulative, (v) the liquidation preference of the
series, (vi) the provisions relating to the redemption of shares of the  series,
(vii)  the obligations to  create a sinking  fund to purchase  or redeem shares,
(viii) the conversion privileges of such  shares into any other class of  COMSAT
capital  stock or any other series of COMSAT Preferred Stock, and (ix) any other
relative rights  or preferences  not inconsistent  with the  COMSAT Articles  or
applicable law. See "DESCRIPTION OF COMSAT CAPITAL STOCK -- Preferred Stock."

    Under  the RSi Articles, the RSi Board  is not authorized to issue preferred
stock.

VOTING RIGHTS

    Under the D.C. Act, unless otherwise provided by a corporation's articles of
incorporation, each  outstanding  share  is  entitled to  one  vote  on  matters
submitted to a shareholders' meeting. A corporation may not vote shares it holds
of  its own stock, and  such shares may not be  counted in determining the total
number of outstanding shares. A corporation, however, may vote shares of its own
stock that it  holds in  a fiduciary  capacity and  must count  those shares  in
determining the total number of outstanding shares at any given time.

    Each  share of COMSAT Common Stock and COMSAT Preferred Stock is entitled to
one vote on matters submitted for vote at shareholder meetings, except in regard
to election  of directors  and where  the  rights of  the preferred  and  common
shareholders  or the holders of  Series I shares and  Series II shares may vary.
See "-- Directors" and  "DESCRIPTION OF COMSAT CAPITAL  STOCK -- Voting  Rights;
Election of Directors."

    The  Satellite Act requires that the  COMSAT Articles provide for cumulative
voting by  shareholders  in the  election  of directors,  thereby  permitting  a
shareholder to give one candidate as many votes as the number of directors to be
elected,  multiplied by the number of shares  held by the voting shareholder, or
to distribute such votes among any number of nominees up to the number for which
such shareholder is eligible to vote.  The provisions for cumulative voting  are
subject to the restrictions described under "-- Directors."

    Pursuant  to authority granted in the  COMSAT Articles, the COMSAT Board has
determined that no person, syndicate or affiliated group of such persons  (other
than  a Common Carrier)  may vote shares held  in excess of  five percent of the
aggregate number of outstanding shares of COMSAT capital stock. See "DESCRIPTION
OF COMSAT CAPITAL STOCK."

    Under  the  Nevada  Law,  unless  otherwise  provided  in  the  articles  of
incorporation  or  in  the  resolution  providing  for  the  issuance  of stock,
stockholders are entitled to one vote per share at all stockholder meetings. RSi
stockholders are  entitled  to  one  vote per  share  on  matters  submitted  to
stockholders  except in regard to election of directors as described below under
"-- Directors."

    The Nevada  Law provides  for cumulative  voting only  when permitted  by  a
corporation's articles of incorporation. The RSi Articles provide for cumulative
voting.

SHAREHOLDER ACTION BY WRITTEN CONSENT

    Under  the D.C. Act, shareholders may take any action (otherwise required to
be taken at a meeting) without a meeting if all shareholders entitled to vote on
the subject matter at issue consent in writing to the action.

    Under the Nevada Law,  unless a corporation's  articles of incorporation  or
by-laws  provide  otherwise, any  action  otherwise required  to  be taken  at a
stockholders' meeting may be taken without  a meeting if holders of  outstanding
stock  with at least a majority of the voting power, or such other proportion as
may be required  for such  an action  at a meeting,  consent in  writing to  the
action. The RSi By-laws provide similarly, except that elections of directors of
RSi may not be made by written consent.

CALLING SPECIAL MEETINGS OF SHAREHOLDERS

    The  D.C. Act allows the president or  secretary of a corporation, the board
of directors, the holders of not  less than one-fifth of all outstanding  shares
entitled   to   vote,   or  any   other   officers  or   persons   provided  for

                                       47
<PAGE>
in the  articles  of  incorporation  or by-laws  to  call  special  meetings  of
shareholders.  The D.C. Act requires that the  purpose or purposes for which the
meeting is called be stated in the notice with respect to a special meeting.

    The COMSAT  By-Laws  provide  that  the Chairman  of  the  Board,  the  Vice
Chairman,  if there is one, the President,  the Secretary or any three directors
who sign a request  may call a special  shareholders' meeting. In addition,  the
COMSAT  By-Laws allow the holders of not  less than one-fifth of all outstanding
shares of COMSAT capital stock entitled to vote to call a special meeting.

    The Nevada Law has no provision relating to who may call special meetings of
stockholders. The Nevada Law requires that the purpose or purposes for which the
meeting is called be stated in the notice with respect to a special meeting. The
RSi By-Laws provide that special meetings may be called by the President, by the
Board, or by the holders of a majority of all the outstanding shares entitled to
vote. The request must state the purpose or purposes of the proposed meeting.

DISTRIBUTIONS TO SHAREHOLDERS

    Under  the  D.C.  Act,  a  board  of  directors  may  declare  dividends  on
outstanding  shares in cash,  property or a corporation's  own shares unless the
corporation is insolvent, its net assets are less than its stated capital, or if
payment of the dividends  would render the corporation  insolvent or reduce  net
assets below stated capital or if such declaration or payment is contrary to any
restrictions  contained in  the articles  of incorporation.  The COMSAT Articles
currently establish a class of Preferred Stock that has priority in the  payment
of  dividends over the COMSAT Common Stock.  No shares of COMSAT Preferred Stock
are currently issued or outstanding.

    The Nevada Law  permits a board  of directors to  pay dividends unless  such
payment  would render the corporation unable to pay its debts as they become due
in the  usual course  of business,  or, except  as specifically  allowed in  the
articles of incorporation, the corporation's total assets would be less than the
sum  of its total liabilities plus the amount needed, if the corporation were to
be dissolved at the time of the distribution, to satisfy the preferential rights
upon dissolution of stockholders whose preferential rights are superior to those
receiving the distribution.  The RSi Articles  have not established  a class  of
preferred  stock.  The  RSi  By-Laws  provide that  the  RSi  Board  may declare
dividends on its outstanding shares in cash, property or its own shares.

SHAREHOLDER APPROVAL OF EXTRAORDINARY TRANSACTIONS

    The D.C. Act  requires a board  of directors  to submit a  plan for  merger,
consolidation or sale of substantially all assets to a vote of shareholders at a
special or annual meeting. The board must deliver a written or printed notice to
shareholders  at least 20 days  before such a meeting  and must include with the
notice a  copy or  summary of  the plan.  Unless the  articles of  incorporation
provide  otherwise, approval  of such  a plan by  a D.C.  corporation requires a
two-thirds affirmative vote of holders of outstanding shares of the corporation.
If a corporation has classes of stock, two-thirds of each class must approve the
plan for it to take  effect. However, in no  event may the required  shareholder
vote  be  reduced to  less than  a  majority of  outstanding shares.  The COMSAT
Articles do  not  provide  for  a  reduced  shareholder  vote.  The  D.C.  Act's
requirements  regarding  shareholder  approval  of mergers  apply  only  to D.C.
corporations. The D.C. Act states that a corporation organized under the laws of
another jurisdiction merging with a D.C. corporation must comply with applicable
provisions of the law  of the state  under which it is  organized. The D.C.  Act
does not provide for share exchanges.

    The  Nevada Law requires a  board of directors to adopt  a plan of merger or
exchange of  shares  and  recommend  the  plan of  merger  or  exchange  to  the
stockholders  (unless  because  of  a  conflict  of  interest  or  other special
circumstance it determines that it should not make a recommendation). Unless the
articles of incorporation or  the board of directors,  acting pursuant to  their
ability to condition submission of the proposed merger or exchange on any basis,
require  a greater vote or  a class vote by stockholders,  the plan of merger or
exchange must be approved by a majority of the voting power unless  stockholders
of a class of shares are entitled to vote thereon as a class. If stockholders of
a  class of shares are so  entitled, the plan must be  approved by a majority of
all votes entitled  to be  cast on  the plan by  each class  and representing  a
majority

                                       48
<PAGE>
of  all votes entitled to be voted. Separate  voting by a class is required: (i)
on a merger, if the plan contains  a provision that, if contained in a  proposed
amendment to articles of incorporation, would entitle particular stockholders to
vote  as a class on the  proposed amendment, and (ii) on  a plan of exchange, by
each class or  series of shares  included in  the exchange, with  each class  or
series  constituting  a  separate  voting class.  The  Nevada  Law  requires the
surviving or acquiring corporation in a  merger or exchange to file articles  of
merger  or exchange with the Nevada secretary of state. A merger is permitted if
the law of the state or country in which the foreign corporation is incorporated
allows such a  merger and  the foreign corporation  complies with  that law.  An
exchange  of  shares is  permitted  if the  corporation  whose shares  are being
acquired is a Nevada corporation even though the law of the state or country  in
which  the acquiring corporation  is incorporated does  not permit the exchange.
Notice of the stockholders' meeting to  consider the proposal must be mailed  at
least  10 days but not more than 60 days prior to the meeting date. Further, the
Nevada law provides that a  corporation may, by action  taken at any meeting  of
the  board of directors of the corporation, and approved by the affirmative vote
of a majority of its stockholders, sell,  lease or exchange all of its  property
and  assets, unless such corporation's articles  of incorporation require that a
larger proportion of stockholders approve such transaction.

DISSENTERS' RIGHTS

    Under the D.C.  Act, shareholders of  a corporation  which is a  party to  a
merger  or consolidation may dissent from a  merger or consolidation and be paid
the fair  value of  their  shares. To  receive  such payments,  dissenters  must
fulfill certain statutory requirements and meet certain deadlines for filing the
dissent.  If the shareholders and the surviving  or new corporation do not agree
upon the value of the shares in question, the dissenters may petition a court to
determine the fair value.

    The Nevada Law gives  appraisal rights to  dissenting stockholders only  for
certain  statutory  mergers  or  consolidations,  including  mergers  for  which
stockholder approval is  required and the  stockholder is entitled  to vote,  or
exchanges in which the corporation's shares will be acquired and the stockholder
is  entitled to  vote. A  corporation must  notify each  stockholder entitled to
appraisal rights that they are  available, and include in  the notice a copy  of
the  Nevada  Law  provisions  granting  such  rights.  Unless  the  articles  of
incorporation of the corporation issuing the shares provide otherwise, or  under
other  limited circumstances, the Nevada Law does not provide a stockholder with
appraisal rights with respect  to any merger  in which the  shares held by  such
stockholder were, at the record date for the stockholder meeting to act upon the
merger,  either listed on a national  securities exchange, designated a national
market security on an interdealer  quotation system by the National  Association
of  Securities Dealers, Inc. ("NASD") or held  by at least 2,000 stockholders of
record, if the stockholder will receive shares of stock of a corporation  which,
at  the  effective  date of  the  merger,  is listed  on  a  national securities
exchange, designated as a national  market security on an interdealer  quotation
system  by the NASD, or  held of record by at  least 2,000 stockholders. The RSi
Articles and By-laws do  not provide for such  appraisal rights. The RSi  Common
Stock  was, on the Record  Date, designated as a  national market security on an
interdealer quotation system by the NASD and held by at least 2,000 stockholders
of record.  The  COMSAT  Common  Stock  was, on  the  date  hereof,  and  it  is
anticipated  that  it will  be, on  the Effective  Date, listed  on the  NYSE, a
national securities exchange. See "THE MERGER -- Appraisal Rights."

CHARTER AND BY-LAW AMENDMENTS

    The D.C. Act allows corporations to amend their articles of incorporation as
often as and  in whatever fashion  desired. The amended  articles, however,  may
contain  only provisions that would be legal in original articles at the time of
amendment. Unless the articles of incorporation provide otherwise, amendments to
articles of incorporation approved by a  board of directors must be approved  by
the  affirmative vote  of the  holders of  two-thirds of  the outstanding shares
entitled to vote to take effect. If amendments affect certain issues,  including
the  number of shares and certain shareholders' rights, then the amendments must
receive approval of  two-thirds of each  class of shares  entitled to vote.  The
D.C.  Act provides that in no event may the required shareholder vote be reduced
to less  than  the  affirmative  vote  of the  holders  of  a  majority  of  the
outstanding  shares entitled to vote. However, the Satellite Act, the provisions
of which  supersede  the  D.C.  Act,  requires  a  vote  of  two-thirds  of  the
outstanding shares of COMSAT capital stock to amend the COMSAT Articles.

                                       49
<PAGE>
    The  D.C.  Act vests  power to  amend  by-laws in  the directors  unless the
articles of incorporation  reserve that  power to the  shareholders. The  COMSAT
Articles empower the COMSAT Board to amend the COMSAT By-Laws.

    The  COMSAT Articles  and the COMSAT  By-Laws require COMSAT  to provide the
COMSAT Board, the Attorney General of the United States, the Chairman of the FCC
and such other persons as the President of the United States may designate  from
time  to time with 10 days' notice of  any meeting called to consider a proposal
to amend the COMSAT Articles, and with  five days' notice of any meeting  called
to consider a proposal to amend the COMSAT By-Laws.

    The Nevada Law allows corporations to amend the articles of incorporation as
desired,  as long as the articles as  amended contain only provisions that would
be legal in original articles at  the time of amendment. Amendments to  articles
of  incorporation  approved by  a board  of  directors must  be approved  by the
affirmative vote of the holders of shares representing a majority of the  voting
power of the corporation. If amendments affect certain issues, including changes
or  alterations in preferences or shareholders' rights, then the amendments must
be approved by  the affirmative  vote of the  holders of  shares representing  a
majority of the voting power of each affected series or class.

    The  Nevada Law empowers the  board of directors to  make the by-laws of the
corporation, subject to the  by-laws, if any, adopted  by the stockholders.  The
RSi  By-Laws confer the power  to amend the By-Laws  on the stockholders and the
board of directors.

DIRECTORS

    The Satellite Act  and the  COMSAT Articles  provide that  the COMSAT  Board
shall  consist of 15  persons who must  be citizens of  the United States. Three
members are appointed by the President of the United States, with the advice and
consent of the United  States Senate, for three-year  terms. Twelve members  are
elected  annually by  the shareholders.  Holders of  COMSAT Preferred  Stock and
Series I shares and holders of  Series II shares, respectively, are entitled  to
elect  a number of directors that varies  with the proportion of shares of stock
held in each  class and  series, as described  in detail  under "DESCRIPTION  OF
COMSAT CAPITAL STOCK."

    No  holder of COMSAT Series  II shares or trustee  for such holder may vote,
either directly  or indirectly,  through subsidiaries  or affiliated  companies,
nominees,  or persons subject  to the holder or  trustee's direction or control,
for more than three candidates for the Board.

    The COMSAT By-Laws state that eight directors are necessary to constitute  a
quorum  for the transaction of business. The COMSAT Articles provide that quorum
requirements may  be  relaxed if  the  President of  the  United States  or  his
delegate  determines that circumstances of national  emergency would not allow a
prompt meeting  of  the  number  of directors  otherwise  required  to  transact
business. The COMSAT By-Laws state that, during a national emergency, a majority
of  the surviving members  of the Board  who can attend  a meeting constitutes a
quorum.

    Under the Nevada Law, a corporation's board of directors must consist of one
or more  members, with  the  number fixed  by the  by-laws  or the  articles  of
incorporation.  Under the RSi Articles,  the RSi Board must  consist of not less
than five directors. Subject to this limitation,  the RSi Board may at any  time
by  the affirmative vote of  a majority of directors  then in office increase or
decrease the actual number of directors. A majority of the directors  constitute
a quorum for transacting business.

    Under  the  D.C.  Act,  a  corporation's  board  of  directors  may  appoint
committees of the board, consisting only of directors. A committee designated as
an executive committee, consisting of two or more directors, may, to the  extent
provided  in the  corporation's by-laws or  in the  resolution establishing such
committee, exercise  all of  the authority  of  the board  of directors  in  the
management  of the business and affairs of the corporation. The COMSAT Board has
established several committees, but does not have an executive committee.

    The Nevada  Law  provides  that  a  corporation's  board  of  directors  may
designate  one  or  more  committees  which,  to  the  extent  provided  in  the
corporation's   by-laws    or    in    the    resolution    establishing    such

                                       50
<PAGE>
committee,  may exercise the powers of the  board of directors in the management
of the business and affairs of  the corporation. Each committee must include  at
least  one director but,  unless the corporation's  articles of incorporation or
by-laws provide otherwise, the  board of directors  may appoint natural  persons
who  are not  directors to  serve on committees.  The RSi  Board has established
several committees, but does not have an executive committee. The RSi Board  has
not appointed any persons who are not directors to serve on committees.

VACANCIES AMONG DIRECTORSHIPS

    Under  the D.C. Act, any  vacancy on a board  of directors occurring for any
reason other than as a result of an  increase in the number of directors may  be
filled by the affirmative vote of a majority of the remaining directors, even in
cases  where the number of remaining directors is less than a quorum, unless the
articles of incorporation provide otherwise.

    Under the COMSAT Articles, any vacancy among the presidential appointees  to
the  Board may be  filled by the President,  with the advice  and consent of the
United States Senate. Any vacancy among the Series I directors may be filled  by
a  majority vote of the Series I directors still serving, even if such directors
constitute less  than  a  quorum.  Any vacancy  existing  among  the  Series  II
directors may be filled by a majority vote of Series II directors still serving,
even  if such directors constitute less than a quorum. No such vote for a Series
II director is valid if cast for  a candidate who, if elected, would afford  any
Common  Carrier direction or control -- either directly or indirectly -- of more
than three directors.

    Under the Nevada Law, all vacancies,  including those caused by an  increase
in  the  number of  directors,  may be  filled by  a  majority of  the remaining
directors, even in cases where the number of remaining directors is less than  a
quorum, unless the articles of incorporation provide otherwise. The RSi Articles
contain  no provisions regarding this matter and,  under the RSi By-Laws, if any
vacancy occurs among the directors, or if the number of directors is  increased,
the  directors in office, even if less than  a quorum, may fill the vacancies or
newly created directorships by majority vote.

REMOVAL OF DIRECTORS

    None of the D.C.  Act, the COMSAT Articles  or the COMSAT By-Laws  expressly
provides for removal of directors.

    Under  the Nevada  Law, holders  of not less  than two-thirds  of the voting
power of  the issued  and outstanding  stock entitled  to vote  for a  board  of
directors may remove, with or without cause, any director or the entire board of
directors  of  a  corporation;  provided,  however,  that  (i)  in  the  case of
corporations with cumulative voting, no director may be removed except upon  the
vote  of stockholders owning sufficient shares to have prevented his election in
the first instance, (ii) the articles of incorporation may require the vote of a
larger percentage of stock entitled to  vote, and (iii) whenever the holders  of
any  class or series of shares are entitled to elect directors, unless otherwise
provided in the articles of incorporation, removal requires only the affirmative
vote of two-thirds  or more of  the holders of  that class or  series. As  noted
above,  the RSi Articles provide for cumulative  voting. The RSi Articles do not
contain any special provisions relating to the removal of directors and  provide
for only one class of stock.

INDEMNIFICATION

    The  D.C.  Act empowers  corporations to  indemnify directors,  officers, or
former directors  or  officers,  or any  persons  who  may have  served  at  the
corporation's  request as directors or officers  of another corporation in which
the indemnifying corporation owns shares  of capital stock or  of which it is  a
creditor.  Corporations may indemnify such persons against expenses actually and
necessarily incurred in connection with defending any action, suit or proceeding
in which they are made parties  because of their position with the  corporation.
The  D.C. Act further provides that corporate by-laws, agreements or shareholder
vote may give  more extensive  protection than the  D.C. Act  specifies to  such
persons.  However,  the  corporation  may  not  indemnify  any  person otherwise
eligible for indemnity who  is adjudged liable for  negligence or misconduct  in
performance of duty.

    The  COMSAT Articles provide for  mandatory indemnification of directors and
officers of COMSAT and its subsidiaries to  the extent permitted by the laws  of
D.C. The COMSAT Articles provide further that

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<PAGE>
expenses  incurred by  such persons shall  be paid  by COMSAT in  advance of the
final disposition of an action, subject  to receipt by COMSAT of an  undertaking
from such person to repay all such amounts if it is ultimately determined he was
not   entitled  to  such  payment.  The  COMSAT  Articles  provide  for  similar
indemnification for  employees  of  COMSAT  and its  subsidiaries  in  the  sole
discretion of the COMSAT Board.

    Under the Nevada Law, a corporation may indemnify any person who was or is a
party or is threatened to be made a party to an action by reason of the person's
service as a director, officer, employee or agent of the corporation or service,
at  the  corporation's request,  as a  director, officer,  employee or  agent of
another corporation,  partnership, joint  venture,  trust or  other  enterprise.
Under  the Nevada Law, a corporation may indemnify such persons against expenses
(including attorneys' fees),  judgments, fines  and amounts  paid in  settlement
that are actually and reasonably incurred by that person in connection with such
action.  The Nevada Law provides,  however, that such person  must have acted in
good faith and in a manner that was reasonably believed to be in (or not opposed
to) the  corporation's best  interests. In  respect of  any criminal  action  or
proceeding,  an indemnified person must have  had no reasonable cause to believe
such  conduct  to  be  unlawful.   Additionally,  the  Nevada  Law  permits   no
indemnification  in any action by or in  the right of the corporation where such
person has been  adjudged liable  to the corporation,  unless, and  only to  the
extent  that,  a court  determines that  such person  reasonably is  entitled to
indemnity in spite of the liability  adjudication. The Nevada Law also  provides
that  the  articles of  incorporation or  the  by-laws of  a corporation,  or an
agreement made by a corporation, may  provide that the corporation must pay  the
expenses  of officers  and directors incurred  in defending a  civil or criminal
action, suit or  proceeding as  such expenses are  incurred, and  in advance  of
final  disposition, upon the receipt of an undertaking to repay the amount if it
is ultimately determined by a court  of competent jurisdiction that such  person
is not entitled to indemnification.

    The   RSi  By-Laws  provide  for  mandatory  indemnification  of  directors,
officers, employees, and agents to the extent permitted by the laws of the State
of Nevada. The RSi By-Laws further provide that RSi may pay expenses incurred by
such indemnified persons in advance of  final disposition of the action  without
receipt of an undertaking.

TRANSACTIONS INVOLVING OFFICERS AND DIRECTORS

    The  D.C. Act provides that a corporation may not lend money to its officers
or directors. Directors who vote for or assent to the making of such a loan  are
jointly  and severally liable to the corporation  for the amount loaned until it
is repaid.

    Under the COMSAT  Articles, directors are  prohibited from participating  in
the  negotiation of  any contract  between COMSAT and  any entity  in which such
director has a  substantial financial interest  or of which  such director is  a
director,  officer, trustee  or employee. Such  director must  notify the COMSAT
Board of  his or  her interest  in a  contract prior  to any  meeting which  the
director plans not to attend, if the interested director knows that the contract
is  proposed for action at such meeting.  If the director attends the meeting at
which  the  contract,  or   any  contract  between   COMSAT  and  the   director
individually, is acted upon, the director much advise the COMSAT Board of his or
her  interest and abstain from  participating in any discussion  or vote on such
contract. The COMSAT Articles  provide that a director  shall be liable for  any
damages  incurred by  COMSAT as a  result of  his or her  contravention of these
provisions if  such contravention  results in  COMSAT entering  into a  contract
which is unfair to COMSAT.

    Under  the Nevada Law, a corporation has  the power to contract and transact
business with its  directors and officers,  or entities in  which a director  or
officer is a director or officer or is financially interested, provided that (i)
the financial interest or common directorship or office is disclosed or known to
the  board of directors (and noted in  the minutes) or the stockholders, and the
board of  directors or  the stockholders,  as  the case  may be,  approves  such
transaction  in good faith by  a majority of the  disinterested directors or the
disinterested stockholders, (ii) the  financial interest or common  directorship
or  office is not disclosed or known by the director or officer at the time such
transaction is brought before  the board of directors  for action, or (iii)  the
contract  or transaction is fair to the corporation at the time it is authorized
or approved.

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<PAGE>
LIABILITY OF DIRECTORS

    The D.C. Act imposes  joint and several liability  on directors who vote  or
assent  to any distribution of the corporation's assets to shareholders, if such
distribution (i) is contrary to the provisions  of the D.C. Act or the  articles
of  incorporation, (ii)  renders the  corporation insolvent  or reduces  its net
assets below its stated capital, or (iii) occurs during liquidation and adequate
provision is not made for the corporation's debts, obligations, and liabilities.
In the first two instances, a director is  not liable if he relied and acted  in
good faith upon a balance sheet and profit-and-loss statement of the corporation
which  the president or officer of the corporation having charge of its accounts
represented to be accurate or which was certified by or otherwise represented in
a written report  of an  independent public  or certified  public accountant  to
fairly  reflect the corporation's financial condition. The D.C. Act also imposes
joint and several liability on directors who vote for or assent to the making of
a loan to an  officer or director until  the loan is repaid.  A director who  is
present  at a meeting of the board of  directors is presumed to have assented to
action taken on a corporate matter  unless the director's dissent is entered  in
the  meeting's  minutes or  the  director files  a  written dissent.  A director
adjudged liable  may  seek  contribution  from  other  directors  and,  in  some
instances, shareholders who knowingly accepted or received such dividends.

    The  Nevada Law  imposes joint and  several liability on  directors who make
distributions to stockholders in willful  or grossly negligent violation of  the
Nevada Law. A director may be held liable unless the director, if present at the
meeting  at which  such action  was agreed  upon, entered  his dissent  upon the
minutes of the meeting, or  if not present at  the meeting, entered his  dissent
upon  learning of such action. A director  may avoid liability with respect to a
distribution to  shareholders if  the director  relied in  good faith  upon  the
corporation's  books  of account  prepared  by any  of  its officers  as  to the
corporation's assets, liabilities, net profits, or other facts pertaining to the
existence and amount of money from which distributions may properly be declared.

    The RSi Articles provide that a  director will not be personally liable  for
damages  for breach of fiduciary duty, except  with respect to acts or omissions
involving intentional misconduct, fraud, a knowing violation of the law, or  the
payment  of  distributions  to  stockholders  in  willful  or  grossly negligent
violation of the Nevada Law.

LIQUIDATION RIGHTS

    The COMSAT Articles  authorize the  issuance of  up to  5,000,000 shares  of
preferred  stock, in addition to 100,000,000  shares of common stock. If issued,
holders of  the  preferred  stock may  be  entitled,  if so  designated  by  the
directors, to certain priorities of distribution upon the liquidation of COMSAT.
As  of the date hereof, COMSAT has not issued, and it is anticipated that on the
Effective Date  COMSAT will  not have  issued, any  shares of  preferred  stock.
Absent  any outstanding shares of preferred stock, the D.C. Act provides that in
the event of a  liquidation of a corporation,  the shareholders are entitled  to
share  ratably in the assets of the corporation remaining after proper provision
is made for unpaid liabilities.

    RSi's capital structure consists  of a single class  of common stock.  Under
the  Nevada Law, in the event of  liquidation of a corporation, the stockholders
are entitled to share ratably in  the assets of the corporation remaining  after
proper provision is made for unpaid liabilities.

DISSOLUTION

    Under the D.C. Act, voluntary dissolution of a corporation requires adoption
of  a  resolution by  the Board  of Directors  and the  affirmative vote  of the
holders of  at least  two-thirds of  the outstanding  shares entitled  to  vote,
unless  the articles of incorporation provide for  a reduced vote, which may not
be less than a majority  of the outstanding shares.  The COMSAT Articles do  not
provide for a reduced shareholder vote.

    The  Nevada Law provides  that voluntary dissolution  requires adoption of a
resolution by a majority of the board of directors and an affirmative vote of  a
majority of the outstanding shares entitled to vote on the resolution.

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<PAGE>
SHAREHOLDER INSPECTION OF BOOKS AND RECORDS

    Under  the D.C. Act,  as modified by  the Satellite Act,  any shareholder or
shareholders of record or any holder of a voting trust certificate has the right
to examine, in person or  by agent or attorney,  the record of shareholders,  at
any  reasonable time,  for any  proper purpose,  and to  make extracts  from the
record. In addition,  under the D.C.  Act, any shareholder  or shareholders  who
hold  at  least five  percent of  all  outstanding shares  may submit  a written
request to any officer, director, or  registered agent of the corporation for  a
statement  of  the corporation's  affairs. In  response to  such a  request, the
president or a vice president or the treasurer or an assistant treasurer of  the
corporation  must make  a sworn  statement of  the assets  and liabilities  of a
particular account, and  this statement  must be  on file  at the  corporation's
registered office within 30 days after presentation of the request. The D.C. Act
establishes  a $50.00  penalty for  any corporation  which refuses  to allow any
shareholder to  examine the  records.  However, the  D.C.  Act provides  that  a
corporation  may defend against such a penalty if the shareholder has within two
years sold, offered for sale, or  aided and abetted another person in  acquiring
any  list  of  shareholders  of  any corporation,  or  if  such  shareholder has
improperly used  any information  obtained through  a prior  examination of  the
records of any corporation.

    The Nevada Law provides that any person who has been a stockholder of record
for  at least  six months, or  any person holding  at least five  percent of all
outstanding shares, or a person authorized in writing by the holders of at least
five percent of  all outstanding shares,  is entitled upon  at least five  days'
written  demand to  inspect, in  person or by  agent or  attorney, during normal
business hours, the stock ledger or duplicate stock ledger and to make  extracts
from  the  ledger.  For purposes  of  this  provision, holders  of  voting trust
certificates  representing  shares  of  a   corporation  must  be  regarded   as
shareholders.  The  Nevada  Law establishes  a  $25.00  per day  penalty  if the
corporation neglects or refuses  to keep the stock  ledger open for  inspection.
However,  the corporation may  deny a stockholder  or other person  the right to
examine records if the stockholder or person refuses to furnish the  corporation
with  an affidavit stating that  the inspection is not  desired for a purpose in
the interest of a business or  object other than the corporation's business  and
that  he has never sold, offered for sale, or aided or abetted another person in
acquiring a  record of  stockholders of  any corporation  for an  interest of  a
business or object other than the corporation's business.

COMBINATIONS WITH INTERESTED SHAREHOLDERS

    The  D.C. Act and  the Satellite Act  do not contain  provisions relating to
combinations with interested shareholders.  However, the Satellite Act  provides
certain  limitations on the ownership of  COMSAT capital stock. See "DESCRIPTION
OF COMSAT CAPITAL STOCK."

    The Nevada Law places  several limitations upon  a corporation's ability  to
engage  in a combination with an "interested stockholder," which is defined as a
beneficial owner of 10 percent  or more of the  voting power of the  outstanding
voting  shares  of  the  corporation,  or  an  affiliate  or  associate  of  the
corporation which at any time within three  years prior to the date in  question
was  the beneficial owner of 10 percent or  more of the voting power of the then
outstanding shares. For three years after an interested stockholder acquires the
shares of  a  corporation  that  cause  such  person  to  become  an  interested
stockholder,  the  corporation  may  not  engage  in  any  combination  with the
interested stockholder  unless  either  the  board  of  directors  approved  the
combination  before the interested stockholder acquired  the shares or the board
approved the interested  stockholder's purchase of  shares before the  purchase.
After  the expiration  of three years  after the date  an interested stockholder
acquires the shares that cause such person to become an interested  stockholder,
a corporation may only engage in a combination with an interested stockholder if
(i)  the combination meets all of the requirements of the corporation's articles
of incorporation,  and either  (a)  the combination  would have  been  permitted
during  the three years after the interested stockholder acquired such shares or
(b) a majority of  the outstanding voting power,  not beneficially owned by  the
interested  stockholder  or any  of the  interested stockholder's  affiliates or
associates, approve the  combination at  a meeting  called for  that purpose  no
earlier  than three years after the interested stockholder acquired such shares,
or (ii) if the combination meets certain other statutory requirements,  relating
to,  among other  things, the consideration  offered to  the corporation's other
stockholders in such combination. The Nevada Law provides that the  requirements
with  respect to combinations  with interested stockholders do  not apply to any
combination if (i) the  original articles of  incorporation contain a  provision
expressly electing not to have these requirements govern,

                                       54
<PAGE>
(ii)  the corporation amended its  by-laws within 30 days  after October 1, 1991
and expressly  elected  not  to  have the  requirements  govern,  or  (iii)  the
corporation  amends its articles  of incorporation expressly  electing not to be
governed by the requirements  and the amendment is  approved by the  affirmative
vote  of a majority of the outstanding voting power, excluding the voting shares
of the  interested  stockholder  and  its affiliates  and  associates.  The  RSi
Articles  and  the RSi  By-Laws do  not  contain provisions  electing not  be to
governed by the Nevada Law requirements.

CONTROL SHARE ACQUISITIONS

    The D.C. Act does not have  a control share acquisition provision.  However,
the  Satellite  Act  provides certain  limitations  on the  ownership  of COMSAT
capital stock. See "DESCRIPTION OF COMSAT CAPITAL STOCK."

    The Nevada Law contains control share acquisition provisions which apply  to
any  acquisition of a controlling interest in certain corporations. In order for
such  provisions  to  apply  to  a  corporation,  it  must  have  200  or   more
stockholders,  at least 100 of whom are  stockholders of record and residents of
Nevada. As  RSi currently  has fewer  than 100  stockholders of  record who  are
residents  of Nevada, such control share acquisition provisions currently do not
apply to it.

                                 LEGAL MATTERS

    The validity of the shares of COMSAT Common Stock to be issued in the Merger
is being passed upon by Crowell  & Moring, Washington, D.C., counsel to  COMSAT.
Shaw,   Pittman,  Potts  &  Trowbridge,  a  partnership  including  professional
corporations, Washington,  D.C., counsel  to  RSi, will  issue a  legal  opinion
concerning certain federal income tax consequences of the Merger.

                                    EXPERTS

    The consolidated financial statements of COMSAT incorporated by reference in
this  Proxy Statement/ Prospectus by reference to COMSAT's Annual Report on Form
10-K for  the year  ended  December 31,  1993 (as  amended  by Amendment  No.  1
thereto)  have been  so incorporated  in reliance  on the  report of  Deloitte &
Touche, independent public accountants, given on  the authority of such firm  as
experts in accounting and auditing.

    The  consolidated financial statements  of RSi included  and incorporated by
reference in this Proxy Statement/Prospectus by reference to RSi's Annual Report
on Form 10-K for the fiscal year  ended June 30, 1993 (as amended by  Amendments
No.  1, No.  2, and  No. 3 thereto)  have been  so included  and incorporated by
reference in reliance  on the report  of Deloitte &  Touche, independent  public
accountants,  given on the authority  of such firm as  experts in accounting and
auditing. A representative of Deloitte & Touche is expected to be present at the
Special Meeting and will have an opportunity  to make a statement, if he or  she
desires, and to respond to appropriate questions.

                            SOLICITATION OF PROXIES

    COMSAT  and  RSi will  share  equally the  expenses  in connection  with the
printing  and  mailing  of  this   Proxy  Statement/Prospectus.  The  costs   of
solicitation  of  proxies will  be  borne by  RSi.  RSi will  reimburse brokers,
fiduciaries, custodians and other nominees for reasonable out-of-pocket expenses
incurred in sending  this Proxy Statement/Prospectus  and other proxy  materials
to,  and  obtaining instructions  relating  to such  materials  from, beneficial
owners of RSi  stock. RSi  stockholder proxies  may be  solicited by  directors,
officers  or regular employees of  RSi and of COMSAT in  person, by letter or by
telephone or  telegram. In  addition, RSi  has retained  Morrow &  Co., Inc.  to
assist in the solicitation of proxies. It is estimated that the fees of Morrow &
Co., Inc. for services to RSi will not exceed $4,000, plus expenses.

                                       55
<PAGE>
                               RSI TRANSFER AGENT

    RSi  has engaged Wachovia Bank  of North Carolina, N.A.  as the new Transfer
Agent with respect to  RSi Common Stock.  The address of  the Transfer Agent  is
Corporate  Trust Department, P.O. Box 3001, Winston-Salem, North Carolina 27102,
and the telephone number is (800) 633-4236. RSi stockholders should contact  the
Transfer  Agent to transfer RSi Common  Stock or replace lost stock certificates
representing RSi Common Stock prior to the Effective Date.

    RSI STOCKHOLDERS SHOULD NOT  SUBMIT THEIR CERTIFICATES  FOR EXCHANGE TO  THE
TRANSFER AGENT. See "THE MERGER -- Exchange of Stock Certificates."

                                          BY ORDER OF THE BOARD OF DIRECTORS
                                          OF RADIATION SYSTEMS, INC.

                                          Anita M. Stutzman
                                          Secretary

                                       56
<PAGE>
           RADIATION SYSTEMS, INC. CONSOLIDATED FINANCIAL STATEMENTS
                                     INDEX

<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
Independent Auditors' Report...............................................................................        F-2
Consolidated Statements of Earnings for the years ended June 30, 1993, 1992 and 1991 (Audited).............        F-3
Consolidated Statements of Financial Position as at June 30, 1993 and 1992 (Audited).......................        F-4
Consolidated Statements of Cash Flows for the years ended June 30, 1993, 1992 and 1991 (Audited)...........        F-6
Consolidated Statements of Stockholders' Equity for the years ended June 30, 1993, 1992 and 1991
 (Audited).................................................................................................        F-7
Notes to Consolidated Financial Statements (Audited).......................................................        F-8
Quarterly Financial Information (Unaudited)................................................................       F-15
Condensed Consolidated Balance Sheet as at December 31, 1993 (Unaudited)...................................       F-16
Consolidated Statements of Earnings for the three months and six months ended December 31, 1993
 (Unaudited)...............................................................................................       F-18
Condensed Consolidated Statements of Cash Flows for the six months ended December 31, 1993 (Unaudited).....       F-19
Notes to Condensed Consolidated Financial Statements (Unaudited)...........................................       F-20
</TABLE>

                                      F-1
<PAGE>
                            RADIATION SYSTEMS, INC.
                          INDEPENDENT AUDITORS' REPORT

Board of Directors and Stockholders
Radiation Systems, Inc.
Sterling, Virginia

    We  have  audited  the  accompanying  consolidated  statements  of financial
position of Radiation  Systems, Inc. and  subsidiaries as of  June 30, 1993  and
1992,  and the related consolidated statements of earnings, stockholders' equity
and cash flows for each  of the three years in  the period ended June 30,  1993.
These  financial statements are the  responsibility of the Company's management.
Our responsibility is to express an opinion on these financial statements  based
on our audits.

    We  conducted  our audits  in  accordance with  generally  accepted auditing
standards. Those standards require that we plan and perform the audit to  obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also  includes
assessing  the  accounting principles  used  and significant  estimates  made by
management, as well as evaluating the overall financial statement  presentation.
We believe that our audits provide a reasonable basis for our opinion.

    In  our  opinion, the  consolidated financial  statements referred  to above
present fairly, in all material respects, the consolidated financial position of
Radiation Systems, Inc. and subsidiaries as of  June 30, 1993 and 1992, and  the
results  of their operations and their cash flows for each of the three years in
the period ended June 30, 1993 in conformity with generally accepted  accounting
principles.

DELOITTE & TOUCHE

Washington, D.C.
August 20, 1993

                                      F-2
<PAGE>
                            RADIATION SYSTEMS, INC.
                      CONSOLIDATED STATEMENTS OF EARNINGS
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                         YEAR ENDED JUNE 30
                                                    ----------------------------
                                                      1993      1992      1991
                                                    --------  --------  --------
<S>                                                 <C>       <C>       <C>
Revenues
  Sales...........................................  $118,790  $127,136  $115,519
  Business interruption insurance income..........     2,996     1,306
                                                    --------  --------  --------
                                                     121,786   128,442   115,519
                                                    --------  --------  --------
Costs and Expenses
  Cost of sales...................................    87,015    93,335    89,499
  General and administrative expenses.............    19,115    18,352    12,462
  Interest expense (income), net..................        80      (164)       32
                                                    --------  --------  --------
                                                     106,210   111,523   101,993
                                                    --------  --------  --------
Earnings before Income Taxes......................    15,576    16,919    13,526
Provision for Income Taxes........................     5,336     6,334     5,157
                                                    --------  --------  --------
Net Earnings......................................  $ 10,240  $ 10,585  $  8,369
                                                    --------  --------  --------
                                                    --------  --------  --------
Earnings Per Share................................  $   1.23  $   1.27  $   1.01
                                                    --------  --------  --------
                                                    --------  --------  --------
</TABLE>

                See notes to consolidated financial statements.

                                      F-3
<PAGE>
                            RADIATION SYSTEMS, INC.
                 CONSOLIDATED STATEMENTS OF FINANCIAL POSITION
                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                                                   JUNE 30
                                                                                            ----------------------
                                                                                               1993        1992
                                                                                            ----------  ----------
<S>                                                                                         <C>         <C>
Assets
Current Assets
  Cash and equivalents....................................................................  $    6,211  $    9,683
  Short-term investments..................................................................       1,746       2,590
  Accounts receivable, less allowance for doubtful accounts of $814 in 1993
   and $839 in 1992.......................................................................      20,312      18,345
  Unbilled costs and accrued profits, less customer progress payments
   of $52,672 in 1993 and $58,337 in 1992.................................................      45,229      36,263
  Inventories.............................................................................      17,444      15,256
  Other current assets....................................................................       2,333         999
                                                                                            ----------  ----------
                                                                                                93,275      83,136
                                                                                            ----------  ----------
Intangible Assets, less accumulated amortization of $2,352 in 1993
 and $1,947 in 1992.......................................................................       6,312       4,828
                                                                                            ----------  ----------
Other Assets..............................................................................         654       1,378
                                                                                            ----------  ----------
Property, Plant and Equipment, at cost
  Land....................................................................................       1,958       1,953
  Buildings...............................................................................      13,323      13,192
  Test range..............................................................................       2,480       2,145
  Machinery and equipment.................................................................      24,888      22,617
  Leasehold improvements..................................................................         347         152
                                                                                            ----------  ----------
                                                                                                42,996      40,059
Less accumulated depreciation.............................................................     (19,862)    (15,829)
                                                                                            ----------  ----------
                                                                                                23,134      24,230
                                                                                            ----------  ----------
                                                                                            $  123,375  $  113,572
                                                                                            ----------  ----------
                                                                                            ----------  ----------
</TABLE>

                See notes to consolidated financial statements.

                                      F-4
<PAGE>
                            RADIATION SYSTEMS, INC.
             CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (CONT.)
                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                                                   JUNE 30
                                                                                            ----------------------
                                                                                               1993        1992
                                                                                            ----------  ----------
<S>                                                                                         <C>         <C>
Liabilities and Stockholders' Equity
Current Liabilities
  Note payable to bank....................................................................  $    3,000  $
  Current portion of long-term debt.......................................................       1,230         817
  Current portion of guaranteed ESOP debt.................................................         748         720
  Accounts payable........................................................................       8,556       9,872
  Accrued salaries, benefits and related expenses.........................................       3,505       3,328
  Customer advances.......................................................................       2,090       1,171
  Income taxes payable....................................................................       3,027         882
  Deferred income taxes...................................................................         738       2,566
  Other current liabilities...............................................................       2,378       2,039
                                                                                            ----------  ----------
                                                                                                25,272      21,395
Long-Term Debt, less current portion......................................................       7,196       6,826
Other noncurrent liabilities..............................................................       1,545       1,664
Deferred Income Taxes.....................................................................       1,492       1,631
Guaranteed ESOP Debt, less current portion................................................       2,271       3,019
                                                                                            ----------  ----------
                                                                                                37,776      34,535
                                                                                            ----------  ----------
Commitments and Contingencies
Stockholders' Equity
  Common stock; $1 par value; 25,000,000 shares authorized; 8,756,619 shares issued in
   1993 and 8,742,369 shares issued in 1992...............................................       8,757       8,742
  Other paid-in capital...................................................................      21,378      21,297
  Retained earnings.......................................................................      62,979      53,537
  Foreign currency translation adjustment.................................................      (1,432)      1,394
  Treasury stock, at cost, 471,432 shares in 1993 and 391,432 shares in 1992..............      (3,064)     (2,194)
  Debt guarantee for ESOP.................................................................      (3,019)     (3,739)
                                                                                            ----------  ----------
                                                                                                85,599      79,037
                                                                                            ----------  ----------
                                                                                            $  123,375  $  113,572
                                                                                            ----------  ----------
                                                                                            ----------  ----------
</TABLE>

                See notes to consolidated financial statements.

                                      F-5
<PAGE>
                            RADIATION SYSTEMS, INC.
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                                             YEAR ENDED JUNE 30
                                                                                      ---------------------------------
                                                                                        1993        1992        1991
                                                                                      ---------  ----------  ----------
<S>                                                                                   <C>        <C>         <C>
Cash Flows from Operating Activities
  Net Earnings......................................................................  $  10,240  $   10,585  $    8,369
  Adjustments to reconcile net earnings to net cash from operating activities:
    Depreciation and amortization...................................................      3,634       3,369       2,500
    Deferred income taxes...........................................................     (2,239)       (275)       (592)
    Unrealized investment (income)..................................................                    (24)        (11)
    Change in assets and liabilities:
      Decrease (increase) in assets:
        Accounts receivable.........................................................     (1,114)      5,041       2,723
        Unbilled costs and accrued profits..........................................     (8,356)     (9,385)      1,904
        Inventories.................................................................     (1,425)        396       4,889
        Other assets................................................................       (870)       (645)        517
      Increase (decrease) in liabilities:
        Accounts payable............................................................     (1,460)     (1,855)      1,635
        Accrued salaries, benefits and related expenses.............................         35         690         371
        Customer advances...........................................................        919         911        (123)
        Income taxes................................................................      2,524        (641)        (25)
        Other liabilities...........................................................        (77)     (2,282)      1,346
                                                                                      ---------  ----------  ----------
        Net cash provided by operating activities...................................      1,811       5,885      23,503
                                                                                      ---------  ----------  ----------
Cash Flows from Investing Activities
  Sale of short-term investments....................................................        844         613          71
  Capital expenditures..............................................................     (2,036)     (3,341)     (5,197)
  Acquisitions, net of cash acquired................................................     (4,345)     (8,887)
                                                                                      ---------  ----------  ----------
        Net cash used by investing activities.......................................     (5,537)    (11,615)     (5,126)
                                                                                      ---------  ----------  ----------
Cash Flows from Financing Activities
  Short-term borrowings.............................................................      3,925                  11,160
  Payments of short-term borrowings.................................................       (925)                (18,060)
  Proceeds from long-term debt......................................................      2,000       6,065
  Payment of long-term debt.........................................................     (2,130)     (2,974)       (456)
  Proceeds from stock option exercises..............................................         96         350         652
  Dividends paid....................................................................       (837)       (570)       (550)
  Purchase of treasury stock........................................................       (870)                   (283)
  Sale of treasury stock to ESOP....................................................                                 93
                                                                                      ---------  ----------  ----------
        Net cash provided (used) by financing activities............................      1,259       2,871      (7,444)
                                                                                      ---------  ----------  ----------
Effect of Exchange Rate Changes on Cash and Equivalents.............................     (1,005)        338
                                                                                      ---------  ----------  ----------
Net Increase (Decrease) in Cash and Equivalents.....................................     (3,472)     (2,521)     10,933
Cash and Equivalents, beginning of year.............................................      9,683      12,204       1,271
                                                                                      ---------  ----------  ----------
Cash and Equivalents, end of year...................................................  $   6,211  $    9,683  $   12,204
                                                                                      ---------  ----------  ----------
                                                                                      ---------  ----------  ----------
Supplemental Cash Flow Information:
  Income taxes paid.................................................................  $   5,095  $    6,331  $    5,812
  Interest paid.....................................................................  $     646  $      525  $      511
                                                                                      ---------  ----------  ----------
                                                                                      ---------  ----------  ----------
</TABLE>

                See notes to consolidated financial statements.

                                      F-6
<PAGE>
                            RADIATION SYSTEMS, INC.
                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                                    FOREIGN
                                                              OTHER                CURRENCY                  DEBT
                                                 COMMON      PAID-IN   RETAINED   TRANSLATION  TREASURY    GUARANTEE
                                                  STOCK      CAPITAL   EARNINGS   ADJUSTMENT     STOCK     FOR ESOP
                                               -----------  ---------  ---------  -----------  ---------  -----------
<S>                                            <C>          <C>        <C>        <C>          <C>        <C>
Balance, July 1, 1990........................   $   5,726   $  22,963  $  35,703               $  (2,004)  $  (4,939)
  Exercise of stock options..................          64         588
  Purchase of treasury stock (30,000
   shares)...................................                                                       (283)
  Sale of treasury stock to ESOP (10,000
   shares)...................................                                                         93         (93)
  ESOP debt payments.........................                                                                    633
  Net earnings...............................                              8,369
  Cash dividends declared ($.10 per share)...                               (550)
                                               -----------  ---------  ---------  -----------  ---------  -----------
Balance, June 30, 1991.......................       5,790      23,551     43,522                  (2,194)     (4,399)
  Tax benefit from stock option
   transactions..............................                     348
  Exercise of stock options..................          38         312
  ESOP debt payments.........................                                                                    660
  Three-for-two stock split..................       2,914      (2,914)
  Net earnings...............................                             10,585
  Cash dividends declared ($.07 per share)...                               (570)
  Foreign currency translation adjustment....                                          1,394
                                               -----------  ---------  ---------  -----------  ---------  -----------
Balance, June 30, 1992.......................       8,742      21,297     53,537       1,394      (2,194)     (3,739)
  Exercise of stock options..................          15          81
  Purchase of treasury stock (80,000
   shares)...................................                                                       (870)
  ESOP debt payments.........................                                                                    720
  Net earnings...............................                             10,240
  Cash dividends declared ($.10 per share)...                               (837)
  Tax benefit associated with dividends on
   unallocated ESOP shares...................                                 39
  Foreign currency translation adjustment....                                         (2,826)
                                               -----------  ---------  ---------  -----------  ---------  -----------
Balance, June 30, 1993.......................   $   8,757   $  21,378  $  62,979   $  (1,432)  $  (3,064)  $  (3,019)
                                               -----------  ---------  ---------  -----------  ---------  -----------
                                               -----------  ---------  ---------  -----------  ---------  -----------
</TABLE>

                See notes to consolidated financial statements.

                                      F-7
<PAGE>
                            RADIATION SYSTEMS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    PRINCIPLES  OF CONSOLIDATION.  The consolidated financial statements include
the accounts of Radiation Systems, Inc., and its wholly owned subsidiaries  (the
Company).  All  significant  intercompany accounts  and  transactions  have been
eliminated.

    REVENUE RECOGNITION.  Sales and  profits on long-term fixed price  contracts
are  recognized under  the percentage of  completion method.  Under this method,
sales and profits are recognized based  upon the relationship of costs  incurred
to  estimated  total  contract costs.  Sales  and profits  on  other fixed-price
contracts are recognized based upon shipment of products. Immediate  recognition
is provided for all anticipated losses on contracts.

    UNBILLED  COSTS AND ACCRUED PROFITS.  Unbilled amounts represent accumulated
costs and accrued profits, principally on U.S. Government contracts, which  will
be  billed  at  future dates  in  accordance  with contract  terms  and delivery
schedules. Substantially  all of  these  amounts are  expected to  be  collected
within one year.

    INTANGIBLE  ASSETS.  Intangible assets include  the excess of cost over fair
value of net assets  acquired and certain other  costs which are amortized  over
5-20 years.

    PROPERTY,  PLANT AND EQUIPMENT.  Depreciation is provided over the estimated
useful lives of the assets using the straight-line method.

    RESEARCH  AND  DEVELOPMENT.    Company-sponsored  research  and  development
expenditures  are charged to expense as incurred ($1,990,000 in 1993, $1,670,000
in 1992, and $566,000 in 1991).

    EARNINGS PER SHARE.  The computation is based on the weighted average number
of common shares and common  equivalent shares outstanding each year  (8,356,000
in 1993, 8,365,000 in 1992, and 8,256,000 in 1991).

    CASH EQUIVALENTS.  Cash equivalents represent highly-liquid investments with
original maturities of three months or less.

    SHORT-TERM  INVESTMENTS.  At June 30, 1993, short-term investments consisted
of  preferred  stocks  with  guaranteed   put  values  valued  at  cost,   which
approximates market, of $1,746,000.

    FOREIGN  CURRENCY TRANSLATION.   The  functional currency  for the Company's
U.K. operations is  the pound sterling.  The Company translates  the assets  and
liabilities  of its U.K. subsidiaries at the  exchange rate in effect at the end
of the reporting period. Revenues and expenses are translated using the  average
exchange  rate  for  the applicable  period.  The cumulative  effect  of foreign
currency translations  is  reported as  a  separate component  of  stockholders'
equity in the consolidated statements of financial position.

    INSURANCE  SETTLEMENTS.  On  October 3, 1992,  the Company sustained tornado
damage at its Largo, Florida, facility. Included in other current assets at June
30, 1993, is $1,647,000 which represents accrued business interruption insurance
and deferred restoration costs, net of insurance payments received. The  Company
is  in the  process of  negotiating a final  insurance settlement  for its claim
which it believes will offset the  costs incurred and to be incurred  associated
with  the tornado damage.  Business interruption insurance  included in revenues
for the year ended June 30, 1993, amounted to $2,996,000. Business  interruption
insurance  included in revenues  for the year  ended June 30,  1992, amounted to
$1,306,000,  and  represents  final  business  interruption  insurance  proceeds
relating  to a  fire which  occurred in  a plant  of one  of the  Company's U.K.
subsidiaries.

    RECLASSIFICATIONS.  Certain reclassifications have been made to prior years'
balances to conform to the classifications  used in the current year. In  fiscal
year  1992, a reclassification of $1,306,000  was made to reflect separately the
amount of  business  interruption insurance  income  which had  previously  been
included in cost of sales on the consolidated statements of earnings.

                                      F-8
<PAGE>
                            RADIATION SYSTEMS, INC.
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

2.  INVENTORIES
    Inventories,  stated at the  lower of cost  (first-in, first-out) or market,
consist of the following at June 30 (in thousands):

<TABLE>
<CAPTION>
                                                                                      1993       1992
                                                                                    ---------  ---------
<S>                                                                                 <C>        <C>
Finished goods....................................................................  $   4,226  $   3,193
Work in progress..................................................................      7,607      7,352
Raw materials.....................................................................      5,611      4,711
                                                                                    ---------  ---------
                                                                                    $  17,444  $  15,256
                                                                                    ---------  ---------
                                                                                    ---------  ---------
</TABLE>

3.  INDUSTRY SEGMENT, GEOGRAPHIC, AND MAJOR CUSTOMER INFORMATION
    The Company  operates  predominantly  in  a single  industry  segment  as  a
manufacturer  and  integrator of  microwave  antennas and  related  products for
worldwide communications markets. As discussed in Note 8,

                                      F-9
<PAGE>
                            RADIATION SYSTEMS, INC.
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

3.  INDUSTRY SEGMENT, GEOGRAPHIC, AND MAJOR CUSTOMER INFORMATION (CONTINUED)
the Company acquired two  operating divisions located in  the United Kingdom  in
1992.  Prior to 1992, all Company operations  were located in the United States.
Sales by major customer,  exports, and financial data  by major geographic  area
are as follows (in thousands):

<TABLE>
<CAPTION>
                                                       1993      1992     1991
                                                     --------  --------  -------
<S>                                                  <C>       <C>       <C>
Major Customers
  U.S. Government (prime and subcontract)
    Department of Defense..........................  $ 35,850  $ 40,912  $24,592
    Other..........................................    38,044    37,552   24,169
                                                     --------  --------  -------
                                                     $ 73,894  $ 78,464  $48,761
                                                     --------  --------  -------
                                                     --------  --------  -------
  Domestic customer................................  $         $ 16,181  $36,756
                                                     --------  --------  -------
                                                     --------  --------  -------
Exports from the U.S...............................  $ 18,673  $ 16,159  $11,981
                                                     --------  --------  -------
                                                     --------  --------  -------
Major Geographic Area
  Sales
    United States
      Customers....................................  $103,980  $116,255
      Intercompany.................................       451        79
                                                     --------  --------
                                                      104,431   116,334
                                                     --------  --------
    England
      Customers....................................    14,810    10,881
      Intercompany.................................       659       807
                                                     --------  --------
                                                       15,469    11,688
  Eliminations.....................................    (1,110)     (886)
                                                     --------  --------
  Consolidated.....................................  $118,790  $127,136
                                                     --------  --------
                                                     --------  --------
  Operating Income
    United States..................................  $ 14,521  $ 15,503
    England........................................     1,135     1,252
                                                     --------  --------
                                                       15,656    16,755
  Interest Expense, net............................       (80)      164
                                                     --------  --------
  Earnings before Income Taxes.....................  $ 15,576  $ 16,919
                                                     --------  --------
                                                     --------  --------
  Identifiable Assets
    United States..................................  $106,956  $ 90,514
    England........................................     8,462    10,785
    Corporate......................................     7,957    12,273
                                                     --------  --------
                                                     $123,375  $113,572
                                                     --------  --------
                                                     --------  --------
</TABLE>

    Intercompany  sales  represent  transfers to  affiliates  between geographic
areas at  amounts which  approximate  manufacturing cost  plus a  normal  profit
margin.  As discussed in Note 1, operating income includes business interruption
insurance income of $2,996,000 in 1993 (U.S.) and $1,306,000 in 1992  (England).
Corporate assets include cash and short-term investments.

4.  SHORT-TERM BORROWINGS AND LONG-TERM DEBT
    The  Company  has  a bank  credit  agreement which  provides  for short-term
borrowings and letters of credit of up to $10,000,000 at an interest rate  equal
to  the prime rate or the London Interbank  Offered Rate (LIBOR) plus 1%, at the
Company's option.  Subsequent  to June  30,  1993,  the commitment  fee  of  1/4

                                      F-10
<PAGE>
                            RADIATION SYSTEMS, INC.
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

4.  SHORT-TERM BORROWINGS AND LONG-TERM DEBT (CONTINUED)
percent  on the  unused portion of  the line was  waived. At June  30, 1993, the
Company had  a $3,000,000  short-term  note payable  outstanding under  a  prior
agreement at the 30-day LIBOR plus 1.5% (4.73% at year-end). Outstanding letters
of  credit applied against  the line of  credit were $2,670,000  and $499,000 at
June  30,  1993  and  1992,  respectively.  The  maximum  amount  of  short-term
borrowings outstanding during 1993 was $3,525,000 for which the weighted average
interest rate was 4.7%. Interest expense was $680,000 in 1993, $447,000 in 1992,
and $484,000 in 1991.

    Long-term debt consists of the following at June 30 (in thousands):

<TABLE>
<CAPTION>
                                                                  1993     1992
                                                                 -------  ------
<S>                                                              <C>      <C>
Industrial revenue bond; secured by real property and certain
 equipment; 7% interest; payable monthly through 1999..........  $   805  $  920
Industrial revenue bond; secured by real property and certain
 equipment; 7% interest payable semi-annually; principal
 payable annually in 1995 through 2004.........................    3,065   3,065
Note payable to bank, unsecured; interest adjusted quarterly at
 the lower of the prime rate or 91 day LIBOR plus 1.5% (4.7% at
 June 30, 1993); payable quarterly through 1997................    4,000   3,000
Capital lease obligation secured by equipment, net of 11.59%
 imputed interest of $142,000 in 1993 and $213,000 in 1992;
 payable monthly through 1997..................................      556     658
                                                                 -------  ------
                                                                   8,426   7,643
Less current maturities........................................   (1,230)   (817)
                                                                 -------  ------
                                                                 $ 7,196  $6,826
                                                                 -------  ------
                                                                 -------  ------
</TABLE>

    Maturities  of  long-term  debt for  the  next  five years  are  as follows:
$1,230,000 in 1994, $1,549,000 in 1995, $1,564,000 in 1996, $1,588,000 in  1997,
$420,000 in 1998, and $2,075,000 thereafter.

    The  Company's bank credit and industrial revenue bond agreements require it
to maintain minimum amounts of working capital, stockholders' equity, and  other
financial requirements. At June 30, 1993, the Company was in compliance with all
such  requirements. The properties  securing the industrial  revenue bonds had a
net book value of $5,418,000 at June 30, 1993.

5.  INCOME TAXES
    The provision for income taxes is comprised as follows (in thousands):

<TABLE>
<CAPTION>
                                                                              1993       1992       1991
                                                                            ---------  ---------  ---------
<S>                                                                         <C>        <C>        <C>
Current
  Federal.................................................................  $   6,229  $   5,053  $   4,803
  State...................................................................        749        881        946
  Foreign.................................................................        558        544
Deferred
  Federal.................................................................     (2,056)      (177)      (531)
  State...................................................................       (118)         5        (61)
  Foreign.................................................................        (65)      (103)
Other.....................................................................         39        131
                                                                            ---------  ---------  ---------
                                                                            $   5,336  $   6,334  $   5,157
                                                                            ---------  ---------  ---------
                                                                            ---------  ---------  ---------
</TABLE>

                                      F-11
<PAGE>
                            RADIATION SYSTEMS, INC.
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

5.  INCOME TAXES (CONTINUED)
    The deferred portions of the provisions for income taxes, which result  from
timing  differences of  revenues and  expenses for  tax and  financial reporting
purposes, are comprised as follows (in thousands):

<TABLE>
<CAPTION>
                                                                                1993       1992       1991
                                                                              ---------  ---------  ---------
<S>                                                                           <C>        <C>        <C>
Income (recognized) under long-term contracts...............................  $  (2,228) $    (599) $    (560)
Accruals currently (not) deductible.........................................       (143)       202       (201)
Amortization of deferred gain on sale/leaseback previously recognized.......         44         90
Tax depreciation in excess of (below) book depreciation.....................         (5)       (14)       113
Other.......................................................................         93         46         56
                                                                              ---------  ---------  ---------
                                                                              $  (2,239) $    (275) $    (592)
                                                                              ---------  ---------  ---------
                                                                              ---------  ---------  ---------
</TABLE>

    The Company's effective tax rate varies from the statutory federal rate as a
result of the following factors:

<TABLE>
<CAPTION>
                                                                                1993         1992         1991
                                                                             -----------  -----------  -----------
<S>                                                                          <C>          <C>          <C>
Statutory federal rate.....................................................       34.2%        34.0%        34.0%
State income taxes net of federal tax benefit..............................        2.7          3.5          4.3
Benefit from decrease in statutory rate on closed contract.................       (2.0)
FSC benefit................................................................        (.8)         (.6)         (.5)
Goodwill amortization......................................................         .8           .7           .5
Other......................................................................        (.6)         (.2)         (.2)
                                                                                   ---          ---          ---
Effective tax rate.........................................................       34.3%        37.4%        38.1%
                                                                                   ---          ---          ---
                                                                                   ---          ---          ---
</TABLE>

    No provision has  been made  for income and  withholding taxes  at June  30,
1993,  which would be payable should  undistributed foreign earnings of $810,000
be distributed as dividends, as the Company intends to continue to reinvest such
earnings in its foreign operations.

    The Financial  Accounting  Standards  Board has  issued  Statement  No.  109
regarding  accounting for income  taxes which requires the  use of the liability
method of accounting for income  taxes and is required  to be adopted in  fiscal
1994.  The Company expects that adoption of  this statement in the first quarter
of 1994 will not have a material effect on its consolidated financial position.

6.  STOCKHOLDERS' EQUITY

    STOCK SPLIT

    In November 1991, the  Company effected a three-for-two  stock split in  the
form  of a  50% stock  dividend on  its common  stock. All  share and  per share
amounts have been restated to reflect the stock split.

    STOCK OPTIONS

    In 1992,  the Company's  stockholders approved  two incentive  stock  option
plans,  a Key  Employees Plan authorizing  450,000 options and  a Directors Plan
authorizing 120,000 options. The plans,  which terminate in August 2001,  permit
the  grant of options for terms of up to  five years and at prices not less than
the fair value at the time of  grant. Options granted under the plans expire  at
varying  dates through  January 1998.  At June 30,  1993, the  Key Employees and
Directors Plans had 66,000 and 60,000 options, respectively, available to grant.
In 1983,  the Company  adopted an  Incentive Stock  Option Plan  and  authorized
315,000  shares, of  which all  have been  granted and  expire at  varying dates
through November 1995. In addition, there are 8,250 non-qualified stock  options
outstanding and currently exercisable which expire in November 1995.

                                      F-12
<PAGE>
                            RADIATION SYSTEMS, INC.
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

6.  STOCKHOLDERS' EQUITY (CONTINUED)
    A summary of stock option activity is as follows:

<TABLE>
<CAPTION>
                                                                               OPTION       EXERCISE
                                                                               SHARES      PRICE RANGE
                                                                              ---------  ---------------
<S>                                                                           <C>        <C>
Outstanding at July 1, 1990.................................................    165,000      $5.58-$6.92
Granted.....................................................................     11,250            $6.83
Exercised...................................................................    (96,750)     $5.58-$6.92
                                                                              ---------  ---------------
Outstanding at June 30, 1991................................................     79,500      $6.00-$6.83
Granted.....................................................................    380,500    $15.00-$18.00
Exercised...................................................................    (57,000)     $6.00-$6.83
                                                                              ---------  ---------------
Outstanding at June 30, 1992................................................    403,000     $6.75-$18.00
Granted.....................................................................    125,000           $13.50
Exercised...................................................................    (14,250)           $6.75
Cancelled...................................................................    (12,500)          $15.00
                                                                              ---------  ---------------
Outstanding at June 30, 1993................................................    501,250     $6.83-$18.00
                                                                              ---------  ---------------
                                                                              ---------  ---------------
Exercisable at June 30, 1993................................................    188,250     $6.83-$15.00
                                                                              ---------  ---------------
                                                                              ---------  ---------------
</TABLE>

7.  RETIREMENT PLANS
    The  Company  has an  Employee Stock  Ownership Plan  (ESOP), as  defined in
Section 497(e)(7) of the Internal Revenue Code, established to acquire shares of
the Company's common  stock for  the benefit  of all  eligible employees.  Since
inception  of the plan in  October 1988, the Company  has sold 915,000 shares of
treasury stock to the ESOP at market values ranging from $6 to $7.83 per  share.
The  ESOP  financed the  purchases with  bank notes  payable, guaranteed  by the
Company, which are due as follows (in thousands):

<TABLE>
<CAPTION>
                                                                                         1993       1992
                                                                                       ---------  ---------
<S>                                                                                    <C>        <C>
Note payable, 8.75% interest, payable quarterly through October 1996.................  $   2,377  $   2,923
Note payable, 10.95% interest, payable quarterly through July 1997...................        642        793
Note payable, 11.35% interest, retired in December 1992..............................                    23
                                                                                       ---------  ---------
                                                                                           3,019      3,739
Less current maturities..............................................................       (748)      (720)
                                                                                       ---------  ---------
                                                                                       $   2,271  $   3,019
                                                                                       ---------  ---------
                                                                                       ---------  ---------
</TABLE>

    The Company makes periodic contributions to the ESOP at least sufficient  to
make  the principal and interest payments as  they are due. Contributions to the
ESOP charged  to expense  totaled  $982,000 in  1993,  $1,039,000 in  1992,  and
$1,030,000  in 1991. For financial statement  purposes, the ESOP's notes payable
are reflected  as Company  debt  and the  corresponding Company  guarantees  are
recorded  as a separate reduction of stockholders' equity. Both the Company debt
and the guarantees are reduced equally by loan principal repayments.  Maturities
of  the ESOP  debt over the  next five years  are as follows:  $748,000 in 1994,
$803,000 in 1995, $862,000 in 1996, $568,000 in 1997, and $38,000 in 1998.

    One of the Company's U.K. subsidiaries  has a defined benefit pension  plan.
At the most recent actuarial valuation date, September 3, 1992, the market value
of  the pension plan's net assets was L5,098,000, which exceeded the actuarially
computed value of benefits by L1,793,000 (or $2,672,000 using the exchange  rate
of  1.49 at  June 30, 1993).  Foreign pension  expense was $117,000  in 1993 and
$127,000 in 1992.

                                      F-13
<PAGE>
                            RADIATION SYSTEMS, INC.
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

8.  ACQUISITIONS
    In January 1993, the Company acquired Anghel Laboratories, Inc. (Anghel) for
$3.1 million in cash plus incentives which allow for payments totaling up to  an
additional  $3.3 million over six years  contingent upon Anghel meeting specific
financial objectives over  the period.  The acquisition  is accounted  for as  a
purchase  and, accordingly, Anghel's results of operations are included with the
Company's consolidated results of operations for the period beginning January 1,
1993.  Anghel  designs,   manufactures  and  markets   a  specialized  line   of
microwave-based  products,  including  satellite  frequency  converters,  signal
control and  frequency  source components,  and  integrated assemblies  used  in
communications, navigation, radar and missile guidance systems.

    In November 1992, the Company acquired certain contract rights, property and
other  intangibles  associated  with  U.S.  Government  tactical  air navigation
(TACAN) antenna  contracts for  $1.3  million (including  $1.2 million  paid  in
1993),  and agreed to pay royalties associated with future TACAN contract awards
over a five-year period.

    In August 1991,  the Company acquired  CSA Limited (CSA)  and PG  Technology
Limited  (PGT) in  the United  Kingdom, for  $8.9 million  in cash,  net of cash
acquired. CSA manufactures  antennas, masts and  related products for  worldwide
communications   markets.   PGT   manufactures   proprietary  optical/electronic
measuring systems and performs precision machining for customers worldwide.  The
acquisition  is accounted for as a  purchase. Summarized below are the unaudited
consolidated results of operations for 1991 on  a pro forma basis as if CSA  and
PGT had been acquired on July 1, 1990 (in thousands, except per share amount):

<TABLE>
<CAPTION>
                                                                                                 1991
                                                                                              ----------
<S>                                                                                           <C>
Revenues....................................................................................  $  130,972
Net Earnings................................................................................  $    8,173
Earnings Per Share..........................................................................  $      .99
Average Shares Outstanding..................................................................       8,256
</TABLE>

9.  COMMITMENTS AND CONTINGENCIES
    The  Company has commitments under long-term noncancellable operating leases
requiring future payments as  follows: $1,144,000 in  1994, $1,095,000 in  1995,
$657,000  in 1996,  $347,000 in  1997, $346,000 in  1998, and  $161,000 in 1999.
Lease expenses were  $1,370,000 in  1993, $1,263,000  in 1992,  and $320,000  in
1991.

    As a U.S. Government contractor, the Company is subject to routine audit and
investigation by various agencies which oversee contract performance. Management
believes that potential claims from such investigations will not have a material
adverse effect on the consolidated financial statements.

    The  Company  is involved  in various  other  litigation through  the normal
course of  business which  management  believes will  have no  material  adverse
effect on the consolidated financial statements.

                                      F-14
<PAGE>
                            RADIATION SYSTEMS, INC.
                   UNAUDITED QUARTERLY FINANCIAL INFORMATION
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                          FIRST     SECOND      THIRD     FOURTH
                                                                        ---------  ---------  ---------  ---------
<S>                                                                     <C>        <C>        <C>        <C>
Fiscal 1993
  Sales...............................................................  $  32,459  $  28,492  $  27,457  $  30,382
  Operating costs and expenses........................................     28,419     25,619     24,827     27,265
  Earnings before taxes...............................................      4,084      3,629      3,452      4,411
  Net earnings........................................................      2,569      2,251      2,504      2,916
  Earnings per share..................................................        .31        .27        .30        .35
Fiscal 1992
  Sales...............................................................  $  33,656  $  31,525  $  31,799  $  30,156
  Operating costs and expenses........................................     29,993     27,731     28,240     25,723
  Earnings before taxes...............................................      4,035      4,097      4,107      4,680
  Net earnings........................................................      2,411      2,626      2,589      2,959
  Earnings per share..................................................        .29        .31        .31        .36
</TABLE>

    EARNINGS  BEFORE  TAXES  FOR  FISCAL  1993  INCLUDES  BUSINESS  INTERRUPTION
INSURANCE INCOME OF $802,000, $941,000, AND $1,253,000 IN THE SECOND, THIRD, AND
FOURTH QUARTERS, RESPECTIVELY.  EARNINGS BEFORE TAXES  FOR FISCAL 1992  INCLUDES
BUSINESS  INTERRUPTION  INSURANCE INCOME  OF  $340,000, $196,000,  $552,000, AND
$218,000 IN THE  FIRST, SECOND,  THIRD, AND FOURTH  QUARTERS, RESPECTIVELY  (SEE
NOTE 1).

                                      F-15
<PAGE>
                            RADIATION SYSTEMS, INC.
                UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS
                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                                         DECEMBER 31,   JUNE 30,
                                                                                             1993         1993
                                                                                         ------------  ----------
<S>                                                                                      <C>           <C>
Assets
Current assets
  Cash and equivalents.................................................................   $    7,436   $    6,211
  Short-term investments...............................................................        1,286        1,746
  Accounts receivable..................................................................       17,623       20,312
  Unbilled costs and accrued profits on contracts in progress, less customer progress
    payments of $42,616 at December 31, 1993, and $52,672 at June 30, 1993.............       49,212       45,229
  Inventories
    Work-in-progress and finished goods................................................       13,051       11,833
    Raw materials......................................................................        6,277        5,611
  Other current assets.................................................................        1,015        2,333
                                                                                         ------------  ----------
                                                                                              95,900       93,275
                                                                                         ------------  ----------
  Intangibles and other assets.........................................................        6,367        6,966
                                                                                         ------------  ----------
  Property, plant and equipment, at cost...............................................       45,799       42,996
  Less accumulated depreciation........................................................      (21,534)     (19,862)
                                                                                         ------------  ----------
                                                                                              24,265       23,134
                                                                                         ------------  ----------
Total Assets...........................................................................   $  126,532   $  123,375
                                                                                         ------------  ----------
                                                                                         ------------  ----------
</TABLE>

           See notes to condensed consolidated financial statements.

                                      F-16
<PAGE>
                            RADIATION SYSTEMS, INC.
            UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (CONT.)
                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                                         DECEMBER 31,   JUNE 30,
                                                                                             1993         1993
                                                                                         ------------  ----------
<S>                                                                                      <C>           <C>
Liabilities and Stockholders' Equity
Current liabilities
  Note payable to bank.................................................................   $    4,000   $    3,000
  Current portion of long-term debt....................................................        1,236        1,230
  Current portion of guaranteed ESOP debt..............................................          775          748
  Accounts payable.....................................................................        7,292        8,556
  Income taxes payable.................................................................          976        3,027
  Deferred income taxes................................................................          436          738
  Other current liabilities............................................................       11,519        7,973
                                                                                         ------------  ----------
                                                                                              26,234       25,272
Long-term debt, less current portion...................................................        6,272        7,196
Other non-current liabilities..........................................................        1,486        1,545
Deferred income taxes..................................................................        1,478        1,492
Guaranteed ESOP debt, less current portion.............................................        1,876        2,271
                                                                                         ------------  ----------
                                                                                              37,346       37,776
                                                                                         ------------  ----------
Stockholders' Equity
  Common stock - $1 par value; 25,000,000 shares authorized;
   8,756,619 shares issued.............................................................        8,757        8,757
  Other paid-in capital................................................................       21,378       21,378
  Retained earnings....................................................................       66,257       62,979
  Foreign currency translation adjustment..............................................       (1,491)      (1,432)
  Treasury stock, 471,432 shares at cost...............................................       (3,064)      (3,064)
  Debt guarantee for ESOP..............................................................       (2,651)      (3,019)
                                                                                         ------------  ----------
                                                                                              89,186       85,599
                                                                                         ------------  ----------
Total Liabilities and Stockholders' Equity.............................................   $  126,532   $  123,375
                                                                                         ------------  ----------
                                                                                         ------------  ----------
</TABLE>

                                      F-17
<PAGE>
                            RADIATION SYSTEMS, INC.
                 UNAUDITED CONSOLIDATED STATEMENTS OF EARNINGS
                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                             THREE MONTHS ENDED     SIX MONTHS ENDED    YEAR ENDED
                                                                DECEMBER 31           DECEMBER 31        JUNE 30
                                                            --------------------  --------------------  ----------
                                                              1993       1992       1993       1992        1993
                                                            ---------  ---------  ---------  ---------  ----------
<S>                                                         <C>        <C>        <C>        <C>        <C>
Revenues
  Sales...................................................  $  27,061  $  28,492  $  53,035  $  60,951  $  118,790
  Business interruption insurance.........................                   802        827        802       2,996
                                                            ---------  ---------  ---------  ---------  ----------
                                                               27,061     29,294     53,862     61,753     121,786
                                                            ---------  ---------  ---------  ---------  ----------
Costs and expenses
  Cost of sales, including general and administrative
   expenses...............................................     24,832     25,619     48,321     54,038     106,130
  Interest expense, net...................................        114         46        228          2          80
                                                            ---------  ---------  ---------  ---------  ----------
                                                               24,946     25,665     48,549     54,040     106,210
                                                            ---------  ---------  ---------  ---------  ----------
Earnings before income taxes..............................      2,115      3,629      5,313      7,713      15,576
Provision for income taxes................................        811      1,378      1,998      2,893       5,336
                                                            ---------  ---------  ---------  ---------  ----------
Earnings before cumulative effect.........................      1,304      2,251      3,315      4,820      10,240
Cumulative effect on prior years' earnings of a change in
 accounting for income taxes..............................                              377
                                                            ---------  ---------  ---------  ---------  ----------
Net earnings..............................................  $   1,304  $   2,251  $   3,692  $   4,820  $   10,240
                                                            ---------  ---------  ---------  ---------  ----------
                                                            ---------  ---------  ---------  ---------  ----------
Earnings per share:
  Earnings before cumulative effect.......................  $     .16  $     .27  $     .40  $     .58  $     1.23
  Cumulative effect on prior years' earnings of a change
   in accounting for income taxes.........................                              .05
                                                            ---------  ---------  ---------  ---------  ----------
                                                            $     .16  $     .27  $     .45  $     .58  $     1.23
                                                            ---------  ---------  ---------  ---------  ----------
                                                            ---------  ---------  ---------  ---------  ----------
</TABLE>

           See notes to condensed consolidated financial statements.

                                      F-18
<PAGE>
                            RADIATION SYSTEMS, INC.
           UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                                                 SIX MONTHS ENDED
                                                                                                   DECEMBER 31
                                                                                               --------------------
                                                                                                 1993       1992
                                                                                               ---------  ---------
<S>                                                                                            <C>        <C>
Cash Flows from Operating Activities.........................................................  $   1,621  $    (203)
                                                                                               ---------  ---------
Cash Flows from Investing Activities
  Capital expenditures.......................................................................     (2,822)      (547)
  Property insurance claim receipts..........................................................      2,670      1,500
  Property insurance claim costs incurred....................................................       (362)    (1,733)
  Sale of short-term investments.............................................................        460        173
  Acquisition of TACAN product line..........................................................                (1,205)
                                                                                               ---------  ---------
                                                                                                     (54)    (1,812)
                                                                                               ---------  ---------
Cash Flows from Financing Activities
  Short-term borrowings......................................................................      4,000
  Payment of short-term borrowings...........................................................     (3,000)
  Payment of long-term debt..................................................................       (918)      (612)
  Dividends paid.............................................................................       (414)      (418)
  Proceeds from long-term debt...............................................................                 2,000
  Proceeds from stock option exercises.......................................................                    96
                                                                                               ---------  ---------
                                                                                                    (332)     1,066
                                                                                               ---------  ---------
Effect of Exchange Rate Changes on Cash and Equivalents......................................        (10)      (814)
                                                                                               ---------  ---------
Net Increase in Cash and Equivalents.........................................................  $   1,225  $  (1,763)
                                                                                               ---------  ---------
                                                                                               ---------  ---------
</TABLE>

           See notes to condensed consolidated financial statements.

                                      F-19
<PAGE>
                            RADIATION SYSTEMS, INC.
         UNAUDITED NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

1.  BASIS OF PRESENTATION
    The  condensed consolidated  financial statements included  herein have been
prepared by Radiation Systems, Inc. (together with its subsidiaries, unless  the
context otherwise requires, referred to herein as the "Company"), without audit,
pursuant to the rules and regulations of the Securities and Exchange Commission.
Certain  information  and footnote  disclosures  normally included  in financial
statements prepared in accordance with generally accepted accounting  principles
have  been condensed  or omitted pursuant  to such rules  and regulations. These
condensed consolidated financial statements should  be read in conjunction  with
the  audited consolidated financial statements and notes thereto included in the
Company's Form 10-K for the year ended June 30, 1993.

    In the opinion  of management,  all adjustments (which  include only  normal
recurring  adjustments)  necessary to  a fair  presentation  of the  results for
interim periods  have been  made.  The results  of  operations for  the  interim
periods  ended December 31, 1993, are  not necessarily indicative of the results
to be expected for the full year.

    Certain reclassifications  have  been made  to  prior periods'  balances  to
conform  to  the  classifications used  in  the  current interim  periods.  As a
supplementary disclosure, the Company has presented a Consolidated Statement  of
Earnings  for the year ended June 30, 1993, in order to more clearly reflect the
impact of the  tornado damage  in October  1992 (see  Note 4)  on the  Company's
operating results for all periods presented.

2.  SUBSEQUENT EVENT -- PROPOSED MERGER WITH COMSAT
    On  January 30,  1994, the Company  entered into a  merger agreement whereby
COMSAT Corporation ("COMSAT") will  acquire all of  the Company's common  stock.
Under  the merger agreement, the  Company will be merged  with and into a wholly
owned subsidiary of COMSAT and each  share of the Company's common stock  (other
than  stock  owned by  the Company  or by  COMSAT or  its subsidiaries)  will be
exchanged for $18.25 in COMSAT common stock, based on the average closing  price
of  COMSAT stock  during 20  trading days  ending five  trading days  before the
closing of the transaction. However, in no event would a share of the  Company's
common  stock be  exchanged for  less than  0.638 or  more than  0.780 shares of
COMSAT common stock.

    The merger is subject to the approval of the Company's shareholders, receipt
of all  required  government  approvals  and  compliance  with  other  customary
conditions.  COMSAT  currently  owns 4.9  percent  of the  Company's  stock. The
Company may be required to pay COMSAT  up to $7.5 million if the transaction  is
not  completed under certain circumstances. The Company has also granted COMSAT,
as part of this transaction, an  irrevocable option that can be exercised  under
certain  circumstances  to  purchase  up  to an  additional  15  percent  of the
Company's common stock, at an exercise price  of $18.25 per share. It is also  a
condition  to the merger that it be treated  as a pooling of interests by COMSAT
for accounting purposes. The Company's shareholders are expected to vote on  the
merger during the second quarter of calendar year 1994.

3.  CUMULATIVE EFFECT ADJUSTMENT
    The Company implemented Statement of Financial Accounting Standards No. 109,
"Accounting  for Income Taxes" ("SFAS 109"),  in the quarter ended September 30,
1993, which changed the method of accounting for income taxes from the  deferred
method  to the liability method. Under the liability method, deferred tax assets
and liabilities are recognized  based on the  temporary differences between  the
carrying  amounts of assets  and liabilities for  financial statement and income
tax purposes using currently enacted tax  rates. The implementation of SFAS  109
resulted  in a favorable $377,000 ($.05  per share) cumulative effect adjustment
to earnings in the quarter ended September 30, 1993.

                                      F-20
<PAGE>
                            RADIATION SYSTEMS, INC.
   UNAUDITED NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

4.  INSURANCE SETTLEMENT STATUS
    On October 3, 1992, the Company sustained tornado damage to plant, equipment
and inventory at its Largo, Florida, antenna pedestal manufacturing facility.

PROPERTY CLAIM

    Included in other current liabilities at December 31, 1993, is $2,657,000 of
property insurance  claim receipts,  net of  restoration and  replacement  costs
incurred  associated with the tornado  damage. The Company is  in the process of
negotiating a  final  insurance  settlement  for its  property  claim  which  it
believes  will offset  future costs to  be incurred associated  with the tornado
damage.

BUSINESS INTERRUPTION CLAIM

    For its business  interruption claim,  the Company  has previously  received
$827,000  and  $2,996,000 which  have been  included in  total revenues  for the
quarter ended September 30,  1993, and the year  ended June 30, 1993  (including
$802,000  in the quarter ended December 31, 1992), respectively. The Company has
submitted a business interruption insurance claim for the quarter ended December
31, 1993,  and believes  it  will reach  a settlement  of  such claim  with  its
insurance company by the end of the fiscal year ending June 30, 1994.

                                      F-21
<PAGE>
                                                                       EXHIBIT A

                          AGREEMENT AND PLAN OF MERGER

    AGREEMENT  AND PLAN OF MERGER ("Agreement") made  as of January 30, 1994, by
and among COMSAT Corporation, a District of Columbia corporation ("COMSAT"), CTS
America, Inc., a Delaware  corporation and a wholly  owned subsidiary of  COMSAT
("CTS"), and Radiation Systems, Inc., a Nevada corporation ("RSI").

    WHEREAS, COMSAT desires to acquire RSI by a merger of RSI with and into CTS,
and  RSI desires the same,  pursuant and subject to  the terms and conditions of
this Agreement;

    WHEREAS, the Boards of Directors of  each of COMSAT and RSI have  determined
that  the proposed merger of RSI  with and into CTS is  in the best interests of
their respective corporations and shareholders;

    WHEREAS, COMSAT, CTS and  RSI intend that  the transactions contemplated  by
this  Agreement qualify as a reorganization within the meaning of Section 368 of
the Internal  Revenue Code  of 1986,  as  amended (the  "Code"), and  that  such
transactions  will  be  accounted for  by  the  pooling of  interests  method of
accounting for financial reporting purposes; and

    WHEREAS, pursuant to  such merger,  CTS shall  be the  merging or  surviving
corporation  (sometimes hereinafter referred to  as the "Surviving Corporation")
and RSI shall be the  merged or disappearing corporation (sometimes  hereinafter
referred to as the "Merged Corporation");

    NOW  THEREFORE, in consideration of the  premises, the mutual benefits to be
derived from this Agreement and the representations, warranties, conditions  and
promises hereinafter set forth, the parties hereby agree as follows:

                                   ARTICLE I
                                   THE MERGER

    Section 1.1  THE MERGER.  Upon the Effective Date (as defined in Section 1.2
herein)  and  subject to  and  upon the  terms  of this  Agreement,  the General
Corporation Law of the  State of Delaware ("Delaware  Corporation Law") and  the
General  Corporation Law of the State  of Nevada ("Nevada Corporation Law"), RSI
shall be merged with and into CTS, the separate corporate existence of RSI shall
cease, and CTS shall continue as  the Surviving Corporation (the "Merger").  CTS
and  RSI  are  hereinafter sometimes  referred  to jointly  as  the "Constituent
Corporations."

        1.1.1  NEVADA ARTICLES OF MERGER.  At the Closing (as defined in Article
    II herein), CTS  and RSI shall  execute and acknowledge  Nevada Articles  of
    Merger  in  the form  of  Exhibit A  hereto  ("Nevada Articles  of Merger"),
    providing  for  the  Merger  pursuant  to  Section  78.458  of  the   Nevada
    Corporation Law.

        1.1.2   DELAWARE  CERTIFICATE OF  MERGER.  At  the Closing,  CTS and RSI
    shall execute and acknowledge a Delaware  Certificate of Merger in the  form
    of  Exhibit B  hereto ("Delaware Certificate  of Merger")  providing for the
    Merger pursuant to Section 252 of the Delaware Corporation Law.

        1.1.3  FILINGS.  Immediately upon completion of the Closing, CTS and RSI
    shall cause the Merger to  be consummated by filing  or causing to be  filed
    the  original Delaware Certificate of Merger with the Secretary of the State
    of Delaware, by recording or causing to be recorded a second original of the
    Delaware Certificate of Merger in the  Office of the Recorder of the  County
    of  New  Castle of  the State  of Delaware  (being the  county in  which the
    registered office of the Surviving Corporation is located), and by filing or
    causing to  be  filed  the  original Nevada  Articles  of  Merger  with  the
    Secretary  of the State of  Nevada, pursuant to Sections  103 and 252 of the
    Delaware Corporation Law and Section  78.458 of the Nevada Corporation  Law,
    respectively.

    Section  1.2  EFFECTIVE DATE.  The  Effective Date of the Merger ("Effective
Date") shall be the later of the day when the Delaware Certificate of Merger  is
duly    filed    with   the    Secretary   of    State    of   the    State   of

                                      A-1
<PAGE>
Delaware or the day when the Nevada  Articles of Merger are duly filed with  the
Secretary  of the State  of Nevada as  provided in Subsection  1.1.3 herein, the
parties intending the  Merger to  be deemed as  having been  consummated at  the
close of business upon the Effective Date, which for purposes of this Agreement,
shall  be deemed  to be 5:00  p.m. local time  in Reno, Nevada  on the Effective
Date. It is the intent of the parties that the Effective Date be the same day as
the Closing Date (as defined in Article  II herein) or, if not practicable,  the
earliest practicable day immediately thereafter.

    Section  1.3   EFFECT  OF  THE MERGER.    At the  close  of business  on the
Effective Date,  the  effect  of the  Merger  shall  be as  provided  under  all
applicable provisions of the Delaware Corporation Law and the Nevada Corporation
Law.  Without limiting the generality of  the foregoing, and subject thereto, at
the close  of  business  on the  Effective  Date  any and  all  assets,  rights,
privileges,  powers and franchises of the Constituent Corporations, individually
and collectively,  shall vest  in the  Surviving Corporation,  and any  and  all
debts,  liabilities,  duties and  obligations  of the  Constituent Corporations,
individually and collectively,  shall vest in,  be deemed to  be assumed by  and
become debts, liabilities, duties and obligations of the Surviving Corporation.

    Section 1.4  THE SURVIVING CORPORATION.

        1.4.1    CERTIFICATE.   The Certificate  of Incorporation  of CTS  as in
    effect upon the Effective Date shall be the Certificate of Incorporation  of
    the  Surviving Corporation, until thereafter amended  as provided by law and
    such Certificate. A copy of such  Certificate is attached hereto as  Exhibit
    C.

        1.4.2   BYLAWS.  The Bylaws of CTS  as in effect upon the Effective Date
    shall be the Bylaws of the Surviving Corporation until thereafter amended as
    provided  by  law,  the  Certificate  of  Incorporation  of  the   Surviving
    Corporation,  and such Bylaws. A  copy of such Bylaws  is attached hereto as
    Exhibit D.

        1.4.3  DIRECTORS AND OFFICERS.   The directors and officers of CTS  upon
    the  Effective  Date  will be  the  initial  directors and  officers  of the
    Surviving Corporation. In the  event a vacancy shall  exist on the Board  of
    Directors  or in any office of CTS upon the Effective Date, such vacancy may
    thereafter be  filled in  the manner  provided by  law, the  Certificate  of
    Incorporation and the Bylaws of the Surviving Corporation.

        1.4.4    SURRENDER.    At  the  Closing,  the  Merged  Corporation shall
    surrender its  stock  registry,  minute  book  and  corporate  seal  to  the
    Surviving Corporation. At the Effective Date the stock transfer books of RSI
    shall  be closed, and there shall be  no registration of transfers of shares
    of capital stock of RSI thereafter.

    Section 1.5  ADDITIONAL  ACTIONS.  If,  at any time  after the Closing,  the
Surviving  Corporation shall consider or be advised that any further assignments
or assurances in law or any other  acts are necessary or desirable to (a)  vest,
perfect  or confirm,  of record or  otherwise, in the  Surviving Corporation its
rights, title or  interest in,  to or  under any  of the  rights, properties  or
assets  of the Merged  Corporation acquired or  to be acquired  by the Surviving
Corporation as a result of, or in connection with, the Merger, or (b)  otherwise
carry  out  the purposes  of this  Agreement  and the  transactions contemplated
hereby, the Merged Corporation shall be deemed to have granted to the  Surviving
Corporation  an irrevocable  power of attorney  to execute and  deliver all such
proper deeds, assignments, novations  and assurances in law  and to do all  acts
necessary  or proper to vest, perfect or confirm title to and possession of such
rights, properties or assets in the Surviving Corporation and otherwise to carry
out the purposes of this Agreement and the transactions contemplated hereby; and
the proper  officers  and  directors  of the  Surviving  Corporation  are  fully
authorized  in the name of  the Merged Corporation or  otherwise to take any and
all such actions.

                                   ARTICLE II
                             CLOSING; CONSIDERATION

    Section 2.1  THE CLOSING.   The closing of the transactions contemplated  by
this Agreement (the "Closing") shall be held at the offices of Crowell & Moring,
1001 Pennsylvania Avenue, N.W., Washington, D.C. 20004 at 11:00 a.m. immediately
following   a  special   meeting  of  the   RSI  shareholders   to  approve  the

                                      A-2
<PAGE>
Merger, or otherwise on the  first business day after  all of the conditions  to
the Closing set out in Articles VI and VII herein have been met or waived, or at
such  other place and date and time as the parties may designate in writing (the
date and time agreed upon for Closing hereinafter the "Closing Date").

    Section 2.2    CONSIDERATION AND  CONVERSION  OF STOCK.    At the  close  of
business on the Effective Date:

        2.2.1   CONVERSION.  Each share of RSI common stock, par value $1.00 per
    share (the "RSI Stock"),  other than shares  specified in Subsection  2.2.2,
    that  is issued  and outstanding  on the  Effective Date  shall be converted
    without any action on the part of the holder thereof into that fraction of a
    share, rounded to  the nearest  thousandth (the  "Conversion Fraction"),  of
    common  stock, without par value, of  COMSAT (the "COMSAT Stock") determined
    by dividing Eighteen Dollars and  twenty-five cents ($18.25) by the  average
    closing  price  of a  whole  share of  COMSAT Stock  on  the New  York Stock
    Exchange Composite Tape  for the twenty  (20) Trading Days  ending with  the
    Trading  Day which  precedes the  Closing Date by  five (5)  Trading Days (a
    "Trading Day" being any day on which the New York Stock Exchange is open for
    business and on which shares of  COMSAT Stock are traded on that  Exchange),
    provided  that the Conversion Fraction shall not be less than .638 and shall
    not be greater than .780. The issuance and voting of the COMSAT Stock  shall
    be subject to any restrictions set forth in the Communications Satellite Act
    of  1962,  as amended,  47  U.S.C. SectionSection  701  et seq.,  the COMSAT
    Articles of Incorporation,  and such  actions that  have been  taken by  the
    Board  of Directors of COMSAT pursuant  to authority granted by Section 5.05
    of the COMSAT Articles of Incorporation.

        2.2.2  CANCELLATION OF  CERTAIN SHARES.  All  shares of RSI Stock  which
    are (i) held in the treasury of RSI or owned by any subsidiary of RSI on the
    Effective  Date,  or  (ii) owned  by  COMSAT  or any  subsidiary  of COMSAT,
    including CTS, on the Effective Date  shall be cancelled without payment  of
    any consideration therefor.

    Section 2.3  EXCHANGE OF AND PAYMENT FOR RSI STOCK.

        2.3.1   NOTICE.  Promptly after the Effective Date COMSAT will cause the
    exchange agent selected  by COMSAT (the  "Exchange Agent") to  send to  each
    holder of record of shares of RSI Stock which shall have been converted into
    shares  of COMSAT Stock  in the Merger an  appropriate letter of transmittal
    for purposes of surrendering such holder's certificates for such shares  for
    exchange  into certificates  of shares of  COMSAT Stock as  provided in this
    Section 2.3.

        2.3.2  CERTIFICATES.   As soon as practicable  after the Effective  Date
    and  after surrender to the Exchange Agent of any certificate which prior to
    the Effective Date shall have represented  any shares of RSI Stock,  subject
    to  the  provisions of  Subsection 2.3.4  herein, COMSAT  shall cause  to be
    distributed to the  person in whose  name such certificate  shall have  been
    registered  certificates registered in the  name of such person representing
    the shares of COMSAT Stock into  which any shares previously represented  by
    the  surrendered certificate  shall have been  converted as of  the close of
    business  on  the  Effective  Date  and  a  check  payable  to  such  person
    representing  the payment of cash in lieu of fractional shares determined in
    accordance with Subsection 2.3.5  herein. Until surrendered as  contemplated
    by  the preceding sentence, each certificate  which immediately prior to the
    Effective Date  shall have  represented any  shares of  RSI Stock  shall  be
    deemed  at  and after  the Effective  Date  to represent  only the  right to
    receive upon such surrender a certificate representing the COMSAT Stock  and
    the payment as so contemplated.

        2.3.3   DIVIDENDS.   No dividends or  other distributions declared after
    the date  of this  Agreement with  respect  to shares  of COMSAT  Stock  and
    payable  to the  holders of  record thereof on  or after  the Effective Date
    shall be paid to the holder of any unsurrendered certificates which prior to
    the Effective Date shall have represented  shares of RSI Stock with  respect
    to  which the shares  of COMSAT Stock  shall have been  issued in the Merger
    until such  certificates shall  be surrendered  as provided  herein,  unless
    otherwise  agreed in  writing by COMSAT,  but (i) upon  such surrender there
    shall be paid to the person in whose name the certificates representing such
    shares of COMSAT  Stock shall  be issued the  amount of  dividends or  other
    distributions  theretofore paid or made  with a record date  on or after the
    Effective Date but prior to surrender with respect to such shares of  COMSAT
    Stock and the amount of

                                      A-3
<PAGE>
    any  cash payable to  such person in  lieu of fractional  shares pursuant to
    Subsection 2.3.5 herein, and (ii) at the appropriate payment date or as soon
    as practicable thereafter, there  shall be paid or  made to such person  the
    amount  of dividends or other  distributions with a record  date on or after
    the Effective Date but prior to  surrender and a payment date subsequent  to
    surrender  payable with respect to such  shares of COMSAT Stock. No interest
    shall be payable  with respect  to the payment  of such  dividends or  other
    distributions  or  cash  in  lieu  of  fractional  shares  on  surrender  of
    outstanding certificates.

        2.3.4  PRIOR  TRANSFER.  If  any cash, dividend,  other distribution  or
    certificate  representing shares of COMSAT Stock is to be paid or made to or
    issued in a  name other than  that in which  the certificate surrendered  in
    exchange  therefor is registered, it shall be  a condition of the payment or
    issuance thereof  that  the certificate  so  surrendered shall  be  properly
    endorsed  and  otherwise in  proper form  for transfer  and that  the person
    requesting such exchange  shall pay to  the Exchange Agent  any transfer  or
    other taxes required by reason of the issuance of a certificate representing
    shares  of COMSAT Stock in any name other than that of the registered holder
    of the certificate surrendered, or otherwise required, or shall establish to
    the satisfaction of the Exchange Agent that such tax has been paid or is not
    payable.

        2.3.5  CASH  IN LIEU OF  FRACTIONAL SHARES.   Notwithstanding any  other
    provision   of  this  Agreement,  no   certificates  or  scrip  representing
    fractional shares of  COMSAT Stock shall  be issued upon  the surrender  for
    exchange  of certificates which  prior to the  Merger shall have represented
    any shares of RSI Stock, no  dividend or other distribution of COMSAT  shall
    relate  to any fractional share and such fractional share interests will not
    entitle the owner  thereof to  vote or  to any  rights of  a shareholder  of
    COMSAT. In lieu of any fractional shares, there shall be paid to each holder
    of  shares  of  RSI Stock  who  otherwise  would be  entitled  to  receive a
    fractional share  of  COMSAT Stock  an  amount of  cash  (without  interest)
    determined  by multiplying  such fraction  by the  closing price  of a whole
    share of COMSAT Stock on the New  York Stock Exchange Composite Tape on  the
    last full trading day prior to the Effective Date.

        2.3.6  FULL SATISFACTION.  Subject to COMSAT's obligation to pay or make
    previously declared dividends and other distributions which remain unpaid or
    unmade,  all rights to receive cash,  if any, other distributions and shares
    of COMSAT Stock into which shares of RSI Stock shall have been converted  in
    the  Merger shall be deemed when paid, made or issued hereunder to have been
    paid, made or issued, as the case may be, in full satisfaction of all rights
    pertaining to such shares of RSI Stock.

        2.3.7  ESCHEAT LAWS.  Notwithstanding any provision of this Section 2.3,
    neither the Exchange Agent nor any  party to this Agreement shall be  liable
    to  a holder of a certificate for RSI  Stock for any shares of COMSAT Stock,
    dividends or other distributions thereon, or proceeds in lieu of issuance of
    any fractional shares thereof,  delivered to a  public official pursuant  to
    applicable escheat or unclaimed property laws.

    Section  2.4  ADJUSTMENTS.   If, between the date  of this Agreement and the
Effective Date (inclusive), the outstanding shares of COMSAT Stock or RSI  Stock
shall  have been changed into a different  number of shares or a different class
by reason of any  reclassification, recapitalization, reorganization,  split-up,
combination,  exchange of shares  or readjustment, or a  stock dividend or other
extraordinary distribution (other than  a nonliquidating cash dividend)  thereon
shall be declared with a record date within said period, the number of shares of
COMSAT  Stock  into which  shares  of RSI  Stock are  to  be converted  shall be
correspondingly adjusted after negotiations conducted in good faith and promptly
concluded between  the  parties, and  the  Nevada  Articles of  Merger  and  the
Delaware Certificate of Merger shall be amended to reflect the same.

    Section  2.5  OTHER DELIVERIES.  At the Closing, each of COMSAT, CTS and RSI
shall use its best  efforts to deliver  or cause to  be delivered the  opinions,
certificates  and other documents respectively required to be delivered pursuant
to Articles VI and VII hereunder.

                                      A-4
<PAGE>
                                  ARTICLE III
                     REPRESENTATIONS AND WARRANTIES OF RSI

    RSI hereby represents and warrants to COMSAT  and CTS as of the date  hereof
and  as of the Closing Date as set forth  in this Article III. RSI is making all
these representations and warranties on behalf of itself and each RSI Subsidiary
(as defined in Subsection  3.1.2 herein), unless  the context otherwise  plainly
requires.  In determining  whether an event,  condition or matter  would have an
effect on or be material to RSI, RSI shall be deemed to include RSI and the  RSI
Subsidiaries,  taken  as a  whole. The  "Disclosure Letter"  referred to  in the
representations and warranties of RSI contained in this Article III refers to  a
letter  which has heretofore been delivered by  RSI to COMSAT and CTS, and which
may be  updated periodically  and  shall be  updated  immediately prior  to  the
Closing  Date pursuant  to Section 5.12.  The Disclosure Letter  (and any update
thereof) may include more information than  is required to be disclosed  therein
and  such inclusions are not an admission that any matter referred to therein is
material. Whenever a representation and  warranty contained in this Article  III
is made to the knowledge of RSI, it shall mean all facts and conditions referred
to  in or omitted from such representation and warranty, and which are known by,
or which should  have been known  by (in light  of circumstantial evidence  made
available  to them  on or  prior to  the date  on which  such representation and
warranty is  made),  the following  individuals:  (i) as  of  the date  of  this
Agreement,  Richard  E. Thomas,  Mark  D. Funston,  R.  Doss McComas,  Marvin D.
Shoemake, William A.  Thomas, Harold A.  Siegel, and the  directors of RSI;  and
(ii) as of the Closing Date each of the individuals referred to in clause (i) of
this  sentence plus  those officers  and employees of  RSI and  the RSI division
presidents and general managers so listed in the Disclosure Letter.

    Section 3.1  ORGANIZATION AND STANDING.

        3.1.1  ORGANIZATION.   RSI is a  corporation duly incorporated,  validly
    existing and in good standing under the laws of the State of Nevada.

        3.1.2    SUBSIDIARIES.   Except  for  those entities  identified  in the
    Disclosure Letter (hereinafter  termed the "RSI  Subsidiaries"), RSI has  no
    subsidiaries  or affiliated companies, is not  a partner or co-venturer with
    any other entity, and does not otherwise directly or indirectly control  any
    other  business entity. Except as identified  in the Disclosure Letter, each
    RSI Subsidiary is a corporation duly organized, validly existing and in good
    standing under  the laws  of the  jurisdiction in  which it  was formed,  as
    indicated  in the Disclosure Letter. Except  as identified in the Disclosure
    Letter, RSI  is  the  sole  record  and  beneficial  owner  of  all  of  the
    outstanding  capital stock  of each  RSI Subsidiary,  free and  clear of any
    liens, pledges, mortgages or encumbrances.

        3.1.3  QUALIFICATION.  RSI and each RSI Subsidiary is duly qualified  or
    licensed  as a foreign corporation to do  business, and is in good standing,
    in  each  jurisdiction  where  the  nature  of  its  activities  makes  such
    qualification  or  license  necessary, except  where  the failure  to  be so
    qualified or  licensed would  not  have a  material  adverse effect  on  the
    business,  assets or  results of  operations of  RSI. The  Disclosure Letter
    identifies: (i) each state in which RSI and each RSI Subsidiary is qualified
    or licensed to do business as a  foreign corporation; and (ii) the name  and
    address of the registered agent for RSI and each RSI Subsidiary in each such
    state.

        3.1.4   CORPORATE POWER.  RSI and  each RSI Subsidiary has all requisite
    corporate power (i) to carry  on its business as  it is now being  conducted
    and  to own and operate the properties  and assets it now owns and operates,
    and (ii) in the case of RSI,  to carry out the provisions of this  Agreement
    and the transactions contemplated hereby.

        3.1.5   CORPORATE DOCUMENTS.   True, correct and  complete copies of the
    Restated Articles of Incorporation  of RSI and each  RSI Subsidiary and  all
    amendments  thereto, and of the  By-laws of RSI and  each RSI Subsidiary and
    all amendments thereto, have been delivered to COMSAT.

    Section 3.2  CAPITALIZATION.

        3.2.1   AUTHORIZED AND  OUTSTANDING  RSI STOCK.   The  total  authorized
    capital  stock of RSI is 25,000,000 shares  of common stock, par value $1.00
    per share, of which, as of the date hereof, (i) 8,285,187 shares are  issued
    and  outstanding,  (ii)  514,750 shares  are  subject to  issuance  upon the

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    exercise of outstanding  options, and  (iii) 471,432 shares  are issued  and
    held  in treasury. As  of the Closing  Date, the total  number of issued and
    outstanding shares of the capital stock of  RSI shall not exceed the sum  of
    (i)  and  (ii).  There  exist  no other  shares  of  capital  stock  of RSI,
    securities which are convertible into shares of capital stock of RSI, or any
    options,  warrants,  contracts,  commitments  or  other  arrangements  which
    subject RSI to the issuance of any shares of capital stock upon the exercise
    thereof or after the passage of time.

        3.2.2    DUE AUTHORIZATION  AND ISSUANCE.    All issued  and outstanding
    shares of the  capital stock of  RSI have been  duly authorized and  validly
    issued and are fully paid and nonassessable.

    Section 3.3  AUTHORIZATION.

        3.3.1   RSI.   RSI  has all requisite  corporate power  and authority to
    execute and deliver this Agreement and, subject with respect to consummation
    of the Merger  to approval  of this  Agreement by  a majority  of all  votes
    entitled  to be cast by holders of shares  of RSI Stock (the "RSI Vote"), to
    perform the transactions contemplated hereby. The execution and delivery  of
    this  Agreement, the performance by RSI of its obligations hereunder and the
    consummation  of  the  transactions  contemplated  hereby  have  been   duly
    authorized  by RSI's  Board of  Directors and, except  for the  RSI Vote, no
    other corporate proceedings  are necessary to  authorize this Agreement  and
    the   transactions  contemplated  hereby.  RSI's   Board  of  Directors  has
    unanimously (a) determined that the Merger  is in the best interests of  RSI
    and  its stockholders, (b) approved all  of the transactions contemplated by
    this Agreement, including  without limitation,  the Merger,  a Stock  Option
    Agreement  of even date  herewith between RSI and  COMSAT (the "Stock Option
    Agreement"), and (c) voted to recommend this Agreement to RSI  stockholders.
    As  of the date of  this Agreement, RSI has  received the written opinion of
    Alex. Brown & Sons Incorporated ("Alex. Brown"), its financial adviser, that
    in the  opinion of  Alex. Brown  the  consideration to  be received  by  RSI
    stockholders  in the Merger is fair, from  a financial point of view, to RSI
    stockholders. Assuming the  valid authorization, execution  and delivery  of
    this  Agreement by  COMSAT and  CTS, this Agreement  is a  valid and binding
    obligation of RSI and is enforceable in accordance with its terms, except as
    limited by applicable bankruptcy, insolvency, reorganization, moratorium  or
    other  laws of general application referring  to or affecting enforcement of
    creditors' rights, or by general equitable principles.

        3.3.2   NO  BREACH  OR  VIOLATION  BY  RSI.    Execution,  delivery  and
    performance  of this Agreement  by RSI and  consummation of the transactions
    contemplated hereby  will not  lead  to or  cause  a violation,  breach,  or
    default  or  result in  the termination  of,  or accelerate  the performance
    required by, or result in the creation or imposition of any Encumbrance  (as
    defined  in Section 3.7.1 hereof) on any  property or assets of RSI, whether
    by notice or lapse of time or  both, or otherwise conflict with any term  or
    provision of the following:

           (a) RSI's Restated Articles of Incorporation and By-laws, as amended;

           (b)   Any  note,  bond,  mortgage,  contract,  indenture,  pledge  or
       agreement to lease, license  or other instrument  or obligation to  which
       RSI or any of the RSI Subsidiaries is a party or is bound: (i) where such
       violation,  breach,  default,  termination,  acceleration  or Encumbrance
       would have  a material  adverse  effect on  the business,  operations  or
       financial  condition  of  RSI; or  (ii)  as to  which  required consents,
       amendments or waivers shall  not have been obtained  by RSI prior to  the
       Closing   for   any   such  violation,   breach,   default,  termination,
       acceleration or Encumbrance; or

           (c) Any court or administrative order, writ or injunction or process,
       or any  permit,  license, or  consent  decree to  which  RSI or  any  RSI
       Subsidiary  is a  party or  is bound:  (i) where  such violation, breach,
       default, termination, acceleration or  Encumbrance would have a  material
       adverse effect on the business, operations or financial condition of RSI;
       or  (ii) as to  which required consents, amendments  or waivers shall not
       have been obtained by  RSI prior to the  Closing for any such  violation,
       breach, default, termination, acceleration or Encumbrance.

    Section  3.4  SEC FILINGS.   RSI has furnished to COMSAT  and CTS a true and
complete copy of (i) each final prospectus and definitive proxy statement  filed
by RSI with the Securities and Exchange

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Commission  (the "SEC") since June  30, 1989 and (ii)  each report on Form 10-K,
8-K or 10-Q (and any  amendments thereto) filed by RSI  with the SEC since  June
30,  1989 (collectively, the "RSI SEC Documents"). Each of the RSI SEC Documents
complied as  to form  in all  material  respects with  the published  rules  and
regulations of the SEC with respect thereto and none of the RSI SEC Documents as
of  the dates they were  filed with the SEC contained  any untrue statement of a
material fact or omitted to state a material fact required to be stated  therein
or  necessary  in  order  to  make  the  statements  therein,  in  light  of the
circumstances under which they were made, not misleading in each case as of  the
date when made.

    Section 3.5  FINANCIAL STATEMENTS.

        3.5.1    SEC FILINGS.   Each  of  the consolidated  financial statements
    included in  the RSI  SEC Documents  (including any  related notes  thereto)
    complied  as to form in  all material respects with  the published rules and
    regulations of  the  SEC  with  respect  thereto  and  fairly  presents  the
    earnings,  financial position, cash  flows and stockholders'  equity, as the
    case may be, of RSI and its  subsidiaries on a consolidated basis as of  its
    date  or for the respective periods set  forth therein (subject, in the case
    of unaudited statements, to normal recurring year-end audit adjustments  and
    when  read in conjunction with the relevant audited financial statements and
    the notes  thereto), in  each case,  in accordance  with generally  accepted
    accounting  principles  ("GAAP")  consistently  applied  during  the periods
    involved, except  as set  forth therein  or, in  the case  of the  unaudited
    statements, as permitted by Rule 10-01 of Regulation S-X as in effect at the
    relevant time.

        3.5.2  ABSENCE OF CHANGES.  Since June 30, 1993, there has not been:

           (a)  Any  material adverse  change  in the  assets,  working capital,
       reserves,  financial  condition,   accounting  methods   or  results   of
       operations of RSI (provided that expenses incurred in connection with the
       transactions  contemplated  hereby  shall  be  excluded  in  making  such
       determination);

           (b) Any material change in the contingent obligations or  liabilities
       of   RSI  by  way  of   guaranty,  documentary  credit,  standby  credit,
       endorsement, indemnity, warranty or otherwise;

           (c) Any waiver or cancellation by RSI of valuable rights or of  debts
       owed to any of them which, taken as a whole, are material to the business
       or financial condition of RSI;

           (d)  Any  damage,  destruction or  loss,  whether or  not  covered by
       insurance, materially and adversely affecting the properties or  business
       of RSI;

           (e)  Any increase  in the rate  or terms of  compensation payable, or
       potentially payable, by RSI to any director, officer or employee,  except
       increases occurring in the ordinary course of business in accordance with
       RSI's   customary   practices  (which   shall  include   normal  periodic
       performance reviews and related compensation and benefit increases);

           (f) Any  increase in  the rate  or terms,  or establishment,  of  any
       bonus,  insurance,  severance, stock  option,  pension or  other employee
       benefit plan, payment  or arrangement  made to, for  or with  any of  the
       employees  of RSI  except increases occurring  in the  ordinary course of
       business in  accordance  with  RSI's  customary  practices  (which  shall
       include  normal periodic performance reviews and related compensation and
       benefit increases);

           (g) Any loan to, or guarantee or assumption of any loan or obligation
       on behalf of, any officer or director of RSI except advances occurring in
       the ordinary  course  of  business in  accordance  with  RSI's  customary
       practices; or

           (h)  Any declaration, setting aside or payment of any dividend (other
       than as permitted by Section 5.7  herein) by RSI (in cash, properties  or
       securities)  or other  distribution of  assets by  RSI in  respect of the
       shares of  its capital  stock, or  issuance, sale,  transfer by  RSI,  or
       commitment  to issue,  sell or transfer  any shares of  its capital stock
       other than  pursuant  to  the  Stock  Option  Agreement,  employee  stock
       options,  director  stock  options and  other  agreements  or commitments
       existing  on  June  30,  1993,  or  any  redemption,  purchase  or  other
       acquisition of any of its securities;

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<PAGE>
PROVIDED  THAT  for  purposes  of  paragraphs (a),  (b),  (c)  and  (d)  of this
Subsection 3.5.2, a material adverse change  or effect shall be deemed to  occur
if as a result of the events described in such paragraphs there is a decrease in
the  aggregate  in  the  stockholders'  equity  of  RSI  as  reflected  on RSI's
consolidated statement of financial position at  June 30, 1993, of five  percent
or greater, to the date of this Agreement or the Closing Date, as applicable.

        3.5.3     NO  UNDISCLOSED  LIABILITIES.    RSI  has  no  liabilities  or
    obligations,  secured  or  unsecured   (absolute,  accrued,  or   unaccrued,
    liquidated  or unliquidated, executory, contingent  or otherwise and whether
    due or to become  due), of a  nature required to be  reflected in a  balance
    sheet  prepared in accordance  with GAAP applied on  a basis consistent with
    prior years, which were not disclosed  in the RSI SEC Documents, except  for
    those liabilities and obligations of RSI incurred since June 30, 1993 in the
    ordinary course of business.

    Section  3.6   FORECASTS.  Notwithstanding  any disclaimers  to the contrary
(whether oral or in writing)  made by or on behalf  of RSI, all forward  looking
statements  made  in  writing  (including  but  not  limited  to  forecasts  and
projections of  revenues,  income  or losses,  capital  expenditures,  or  other
financial   items,  management  plans  and  objectives  for  future  operations,
statements of  future economic  performance and  statements of  the  assumptions
underlying  or relating to any of the foregoing) by RSI in the "Bid and Proposal
Schedule" delivered to COMSAT prior to the  date hereof or updated prior to  the
Closing  Date, or  in any Form  10-K or  Form 10-Q (and  any amendments thereto)
filed with the SEC after June 30, 1992, were made based upon reasonable  grounds
(in the case of the "Bid and Proposal Schedule" delivered to COMSAT prior to the
date  hereof, taking into account RSI's procedure for assembling the schedule as
described in the Disclosure Letter) and disclosed in good faith.

    Section 3.7  PROPERTIES; LEASES; TANGIBLE ASSETS.

        3.7.1   TITLE.   The  Disclosure  Letter contains  a  list of  all  real
    property  which RSI purports  to own. To  RSI's knowledge, RSI  has good and
    valid title  to or,  in the  case of  leased properties,  a good  and  valid
    leasehold  interest in, all of the assets which it purports to own or lease,
    including all  assets  (real, personal  or  mixed, tangible  or  intangible)
    reflected  in the June 30, 1993 consolidated financial statements of RSI, or
    acquired by RSI thereafter, except those assets disposed of in the  ordinary
    course  of business after June 30, 1993  and the title to each such property
    and asset of RSI is free and clear of any title defects, objections,  liens,
    mortgages,  security interests,  pledges, charges  and encumbrances, adverse
    claims, equities or other  adverse interests of  any kind including  without
    limitation,   leases,  chattel   mortgages,  conditional   sales  contracts,
    collateral security  arrangements  and  other title  or  interest  retention
    arrangements (collectively the "Encumbrances"), except as follows:

           (a)  Any  lien  for  taxes  or  other  governmental  charges  not yet
       delinquent, or the validity of which is being contested in good faith  by
       appropriate  proceedings  and as  to  which adequate  reserves  have been
       established by RSI;

           (b) Any Encumbrances reflected on the financial statements  contained
       in  the RSI SEC Documents, with such changes in the amount thereof as may
       have occurred since June 30, 1993 in the ordinary course of business  and
       which  changes  will not  materially reduce  the  aggregate value  of the
       property and assets held by RSI;

           (c) Such other imperfections  of title or  Encumbrances which, as  of
       the  Closing Date, will not materially  reduce the aggregate value of the
       property and assets of RSI;

           (d) Any progress payment liens arising from progress payments made by
       the United States Government or any agency thereof on contracts affecting
       the assets of RSI; and

           (e) Any Encumbrances  or other matters  identified in the  Disclosure
       Letter.

        3.7.2   USE RESTRICTIONS.   With respect  to any real  property owned or
    leased by  RSI,  to  RSI's  knowledge  there  exists  no  applicable  zoning
    ordinance,    building    code,   use    or   occupancy    restriction,   or

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<PAGE>
    any material violation of  any such ordinance, code  or restriction, or  any
    condemnation  action  or proceeding  with  respect thereto,  that materially
    detracts from the aggregate value of  the real property as reflected in  the
    June 30, 1993 consolidated statement of financial position of RSI.

        3.7.3    CONDITION.   To RSI's  knowledge,  all tangible  properties and
    assets of RSI that  are necessary or  useful to the business  of RSI are  in
    good  operating condition and  repair, ordinary wear  and tear excepted, and
    are adequate for the uses to which they are put.

        3.7.4   LEASES.   The Disclosure  Letter identifies  all leases  with  a
    remaining  term of more than one year and aggregate remaining lease payments
    due of $100,000 or more  to which RSI is a  party or is otherwise bound  for
    the  lease of  real property or  personal property or  equipment pursuant to
    which RSI leases real or personal property or equipment either as the lessor
    or as the  lessee. With  respect to such  leases, to  RSI's knowledge  there
    exist  no defaults by  RSI, or defaults by  a lessor or  any third party, or
    misrepresentations with  respect to  such  leases made  by RSI,  any  lessor
    and/or  any  third  party,  that  materially  and  adversely  affect  in the
    aggregate the business, operations or financial condition of RSI.

        3.7.5   GOVERNMENT  FURNISHED  EQUIPMENT.   RSI's  materials  management
    systems relating to inventories of equipment and other materials procured or
    held  by RSI for  the performance of  any contracts (prime  or sub) with the
    U.S. Government are adequate  and appropriately maintained  for the uses  to
    which  they are put or required to be put under the terms of such contracts.
    All items of inventory,  equipment and other materials  procured or held  by
    RSI  for  the performance  of any  contracts  (prime or  sub) with  the U.S.
    Government have been maintained in the  condition they were when loaned,  or
    bailed  to, or procured by RSI, ordinary  wear and tear excepted, or used or
    processed for the purposes for which they were intended and if such items of
    inventory,  equipment  and  other  materials  were  returned  to  the   U.S.
    Government  or its designee at any time  prior to the Closing Date, there is
    no basis for a claim for  loss, damage, negligence or reckless disregard  of
    use  or care of such items of inventory, equipment and other materials to be
    asserted by the  U.S. Government that  if successful would  have a  material
    adverse effect on the business, results of operations or financial condition
    of RSI.

    Section 3.8  BACKLOG.

        3.8.1   AMOUNT.   The  Disclosure Letter  sets forth  a schedule  of the
    backlog by contract of RSI (excluding, for purposes of the Disclosure Letter
    prior to execution of  this Agreement, the backlog  by contract of the  Mark
    Antennas, PG Technologies, and CSA Antenna Systems Division), as of December
    31,  1993,  for products  and  services to  be  provided by  RSI,  for those
    contracts having a value  of at least $25,000,  including (i) the  aggregate
    dollar  amount of firm and funded  backlog, (ii) the aggregate dollar amount
    of unfunded backlog (including without limitation unexercised options),  and
    (iii)  the aggregate  dollar amount  of backlog  for which  RSI has received
    notice  of  program  selection  but  final  contract  terms  have  not  been
    negotiated.  At the Closing Date, the Disclosure Letter shall set forth on a
    consistent basis (except that contracts having a value of less than  $25,000
    may  be included) a  schedule of the backlog  of RSI by  contract or, in the
    case of  the Mark  Antenna  and PG  Technology  divisions, by  division  for
    contracts having a value of less than $100,000, which schedule shall show an
    aggregate contract backlog for categories (i), (ii), and (iii), above, of at
    least  $118,500,000.  For  purposes  of  this  Subsection  3.8.1,  where the
    contract or applicable  law or regulation  would prohibit identification  of
    the customer, the Disclosure Letter will omit such identification.

        3.8.2   ORDINARY COURSE.  All  of the contracts constituting the backlog
    of RSI (i) have been  entered into in the  ordinary course of business,  and
    (ii)  are capable  of performance  by RSI in  accordance with  the terms and
    conditions of each such contract, without materially and adversely affecting
    the financial condition  or results  of operations  of RSI.  Since June  30,
    1993,  RSI has  not changed in  any material respects  its pricing policies,
    practices or objectives with respect to  return on sales in connection  with
    its outstanding bids and proposals, when considered in the aggregate.

    Section 3.9  ACCOUNTS RECEIVABLE.  RSI's accounts receivable, unbilled costs
and  accrued  profits  (less  customer  progress  payments),  notes  receivable,
contracts in progress,  accounts payable  and notes  payable (collectively,  the
"Receivables  and  Unbilled Costs")  as of  the  Closing Date  shall be  or were
recorded on its

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<PAGE>
books and records  in the ordinary  course of business  in accordance with  GAAP
applied  on a  basis consistent  with prior  years. Since  June 30,  1993, RSI's
consolidated  financial  statements  include   reserves  with  respect  to   the
Receivables  and Unbilled Costs reflected therein against doubtful collection or
billings which in the opinion of RSI, its officers or directors, are adequate.

    Section 3.10  INVENTORIES.  All inventories of RSI (i) reflected in its June
30, 1993 consolidated statement of financial position, or (ii) to be held as  of
the  Closing Date, have been or will have been acquired or manufactured, and are
in amounts RSI reasonably  believes to be adequate  to fill customer orders,  in
the  ordinary  course  of business  in  accordance with  RSI's  normal inventory
practices. For  purposes of  preparing  its June  30,  1993 and  any  subsequent
consolidated  statement of financial position, the  inventories held by RSI were
valued at cost, and as to classes of items inventoried and methods of accounting
and pricing determined in a manner consistent with prior years.

    Section 3.11  INTELLECTUAL PROPERTY.

        3.11.1   PATENTS AND  KNOW-HOW.   The  Disclosure  Letter sets  forth  a
    complete  and accurate list of each  patent, patent application and docketed
    invention, by date and germane case or docket number and country of  origin,
    and  each  license or  licensing agreement,  by date,  term and  the parties
    thereto,  for  each  of   the  patents,  patent  applications,   inventions,
    trade-secrets,  rights to know-how,  processes, computer programs  or use of
    technology, held or employed by  RSI (each such patent, patent  application,
    license  or  licensing  agreement  listed  thereon  hereinafter  termed  the
    "Patents and Licenses"). With respect to the Patents and Licenses, and  with
    respect  to all other  technology including but not  limited to research and
    development results, computer programs, processes, trade secrets,  know-how,
    formulae,   chip   designs,  mask   works,  inventions   and  manufacturing,
    engineering, quality control, testing, operational, logistical,  maintenance
    and  other  technical information  and technology  held  or employed  by RSI
    ("RSI's Technology") and except as set forth in the Disclosure Letter:

           (a) RSI  owns,  free  and  clear  of  all  liens,  pledges  or  other
       encumbrances,  all right, title and interest  in the Patents and Licenses
       and in  RSI's Technology,  with all  rights to  make, use,  and sell  the
       property  embodied in  or described  in the  Patents and  Licenses and in
       RSI's Technology and which are material to the business or operations  of
       RSI.  To RSI's knowledge, its  use of the Patents  and Licenses and RSI's
       Technology does not conflict with,  infringe upon or violate any  patent,
       patent license, patent application, mask work, mask work registration, or
       any  pending application relating thereto, or any trade secret, know-how,
       programs or processes of any third person, firm or corporation;

           (b) RSI either owns the entire  right, title and interest in, to  and
       under,  has an express license to use, or has acquired in connection with
       the acquisition of equipment or inventory an implied license to use,  any
       and  all  inventions, processes,  computer programs,  know-how, formulae,
       trade secrets,  patents,  chip  designs, mask  works,  trademarks,  trade
       names,  brand names and copyrights which  are material to the business or
       operations of RSI.

           (c) The U.S. government has no rights with respect to any  "technical
       data"  or "computer software" that  are owned by RSI  and are material to
       the business or operations of RSI.

        3.11.2  TRADEMARKS AND COPYRIGHTS.   The Disclosure Letter sets forth  a
    complete  and accurate list of each trademark, trade name, and trademark and
    trade name  registration  or  application, and  copyright  registration  and
    application  for copyright registration, by date  and germane case or docket
    number and country of  origin, and each license  or licensing agreement,  by
    date  and the parties  thereto, for each trademark  and copyright license or
    licensing  agreement,  held  or  employed  by  RSI  (each  such   trademark,
    copyright,  application, and license or licensing agreement hereafter termed
    the "Trademarks  and  Licenses"). Except  as  set forth  in  the  Disclosure
    Letter,   RSI  owns,  free  and  clear   of  all  liens,  pledges  or  other
    encumbrances, all right, title and  interest in the Trademarks and  Licenses
    which are material to the business or operations of RSI. To RSI's knowledge,
    its use of the Trademarks and Licenses does not

                                      A-10
<PAGE>
    conflict with, infringe upon or violate any trademark, trade name, trademark
    or trade name registration or application, copyright, copyright registration
    or  application,  service mark,  brand  mark or  brand  name or  any pending
    application relating thereto, of any third person, firm or corporation.

    Section 3.12  CONTRACTS AND OBLIGATIONS.

        3.12.1  IDENTIFICATION.  The Disclosure Letter includes an accurate  and
    complete list as of the date indicated therein of:

           (a)  All agreements and contracts between  RSI and (i) its vendors or
       suppliers the termination of which  would have a material adverse  effect
       on  the business, operations or financial  condition of RSI, and (ii) its
       customers (each U.S. government agency  deemed to be a separate  customer
       and  where the  contract or applicable  law or  regulation would prohibit
       identification of  the customer,  the Disclosure  Letter will  omit  such
       identification) where the backlog for such contract is $25,000 or more;

           (b)  All loan agreements and other evidences of indebtedness, and all
       letters of credit  or other documentary  credits, having in  each case  a
       total liability of $50,000 or more;

           (c)  All distributorship, non-employee commission or marketing agent,
       representative or franchise agreements providing for the marketing and/or
       sale of the products or services of RSI;

           (d) All partnership  agreements for  the organization  of limited  or
       general  partnerships in  which RSI is  a partner,  all limited liability
       company agreements, and all joint ventures to which RSI is a party;

           (e) All agreements or arrangements for the sale of any of the  assets
       of RSI except in the ordinary course of business;

           (f)  All employment  contracts or consulting  contracts reflecting an
       RSI commitment  of  $100,000  or  more, or  agreements  with  respect  to
       severance or similar arrangements; and

           (g) To RSI's knowledge, all contracts or agreements with any officer,
       director or employee of RSI or any member of their immediate families, or
       with any entity under the control of any officer, director or employee of
       RSI or any member of their immediate families, whether individually or in
       combination with any other such person or persons.

        3.12.2   FULL FORCE AND EFFECT.   Except as may be limited by applicable
    bankruptcy, insolvency, reorganization, moratorium or other laws of  general
    application  referring to or affecting enforcement of creditors' rights, and
    by general  equitable principles,  each agreement,  contract and  obligation
    having a total value of $100,000 or more identified in the Disclosure Letter
    pursuant  to  Subsection 3.12.1  is valid  and binding  on each  other party
    thereto in accordance with their respective terms.

        3.12.3   NO DEFAULT.   With  respect to  each con-tract,  agreement  and
    obligation  having  a total  value  of $100,000  or  more identified  in the
    Disclosure Letter pursuant to Subsection  3.12.1, neither RSI nor any  other
    party  thereto is in material breach thereof or material default thereunder,
    and to RSI's  knowledge, no notice  has been received  from the other  party
    thereto of any such material breach or material default (whether by lapse of
    time or notice or both).

        3.12.4   NO COMMITMENTS.  RSI has no commitment or undertaking to retain
    after Closing any attorneys, accountants, actuaries, appraisers,  investment
    bankers, or management consultants.

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    Section 3.13  EMPLOYEES; COMPENSATION; LABOR.

        3.13.1   EMPLOYEES  AND COMPENSATION.   Prior  to the  Closing, RSI will
    provide to COMSAT and CTS a list  dated within 15 days prior to the  Closing
    Date of all persons who are employed by RSI, together with their base salary
    and bonus paid or payable for the most recent fiscal year, and the date upon
    which  such compensation was last varied  or increased, title, original date
    of hire and vacation benefits, and any agreed to current or future  benefits
    or  compensation of such  employees. The Disclosure  Letter contains a true,
    correct and complete list of  all employment policies, procedures,  manuals,
    and  other similar rules or regulations of RSI currently in effect regarding
    the general  conduct,  compensation,  labor  relations  and  employment  and
    severance   of  RSI's  employees,  copies  or  descriptions  of  which  have
    heretofore been provided to COMSAT and CTS.

        3.13.2  CERTAIN LABOR  MATTERS.  Except as  set forth in the  Disclosure
    Letter:

           (a)  To RSI's knowledge,  none of its  division managers or executive
       officers has indicated to any director, officer, or manager of RSI his or
       her intention to cancel or otherwise terminate his relationship with  RSI
       or his relationship with CTS if CTS retains such person after Closing;

           (b)  There  is no  union  representing the  interests  of any  of RSI
       employees and,  to the  knowledge  of RSI,  there  are no  RSI  employees
       seeking or attempting to organize union representation;

           (c)  There  are  neither  pending  nor,  to  the  knowledge  of  RSI,
       threatened any strikes,  work stoppages, work  disruptions or  employment
       disruptions  by any  of the  RSI employees  that would  materially impair
       RSI's business, operations or financial condition;

           (d) To RSI's knowledge, there are neither pending nor threatened  any
       suits,  actions,  administrative proceedings,  hearings,  arbitrations or
       other proceedings between RSI and any of its employees involving a  claim
       of $50,000 or more;

           (e)  With respect  to its employees,  to RSI's  knowledge, during the
       past five (5) years  RSI (i) has complied  in all material respects  with
       all  Federal,  state  and  local laws  and  regulations  relating  to the
       employment of labor, including any provisions thereof relating to  wages,
       hours,  collective  bargaining and  the  payment of  social  security and
       similar taxes, (ii) is  not liable for any  material arrears of wages  or
       any  taxes or penalties for failure to  comply with any of the foregoing,
       (iii) has not committed any material unfair labor practices, and (iv) has
       complied in all material respects  with all applicable provisions of  the
       Occupational  Safety and Health Act of  1970, as amended, and regulations
       promulgated pursuant thereto;

           (f) To RSI's knowledge,  RSI is not required  to make any capital  or
       other  expenditures of $100,000 or more to comply with the Americans With
       Disabilities Act  of 1990,  as  amended, and  the rules  and  regulations
       promulgated thereunder; and

           (g)  To RSI's knowledge,  since June 30, 1993,  none of its employees
       has filed any  complaint relating  to RSI's employment  of its  employees
       with  any governmental or  regulatory authority or  brought any action in
       law or in equity with respect thereto.

        3.13.3  EMPLOYEE BENEFIT PLANS; ERISA.

           (a) Prior to  Closing and  with adequate  time for  review, RSI  will
       provide  COMSAT an  accurate and  complete list  of each  bonus, deferred
       compensation,  incentive  compensation,  severance  or  termination   pay
       agreement,  hospitalization  or  other fringe,  medical,  dental, retiree
       medical, dental  or other  welfare benefit  plan, stock  purchase,  stock
       option,  pension, life  or other insurance,  profit-sharing or retirement
       plan or arrangement, and each other employee benefit plan or  arrangement
       maintained  or contributed to by RSI, whether formal or informal, whether
       legally binding or not  (the "Plans"), and which  either required or  are
       expected  to require expenditures  or contributions by  RSI in the fiscal
       year ended June  30, 1993  or the  fiscal year  ended June  30, 1994,  as

                                      A-12
<PAGE>
       applicable,  of $100,000  or more.  Such list  will set  forth the annual
       amount of employer contributions accrued,  paid or payable for  Employees
       of  RSI (domestic or foreign) during fiscal  1993 pursuant to each of the
       Plans. The amount of employer contributions accrued, paid or payable  for
       all Employees of RSI (domestic or foreign) during fiscal 1993 pursuant to
       the  Plans  did not  exceed $7,000,000.  RSI  does not  have any  plan or
       commitment, whether formal  or informal  and whether  legally binding  or
       not, to create any additional Plan or modify or change any existing Plan.
       RSI  has heretofore delivered or will promptly deliver to COMSAT true and
       complete copies of (i) the documents  governing all such Plans and  their
       related  trusts, (ii) the  most recent actuarial  reports or accountants'
       reports prepared with respect  to each such Plan,  (iii) the latest  Form
       5500  filed with the  Internal Revenue Service with  respect to each such
       Plan, and  (iv)  the  most  recent determination  letter  issued  by  the
       Internal  Revenue  Service  for  each  such  Plan  which  has  received a
       determination letter.

           (b) RSI does not have and has not  in the past five years had a  Plan
       to which Title IV of the Employee Retirement Income Security Act of 1974,
       as amended ("ERISA"), applies or has applied.

           (c)  Prior  to  Closing  and  with  sufficient  time  for  review the
       Disclosure Letter will list  each Plan in existence  since June 30,  1989
       that  is an "employee benefit  plan," as such term  is defined in Section
       3(3) of ERISA and the rules and regulations promulgated thereunder, which
       at any time covered  any employee of RSI  (each such Plan is  hereinafter
       referred  to as  an "ERISA  Plan"), and  which required  contributions or
       expenditures by  RSI in  any given  fiscal year  since June  30, 1989  of
       $100,000  or more,  and copies  of such Plans  will be  made available to
       COMSAT.

           (d) Except as set forth in  the Disclosure Letter: (i) No ERISA  Plan
       is  a "multiemployer plan"  as that term  is defined in  Section 3(37) of
       ERISA; (ii) to  RSI's knowledge neither  RSI, any ERISA  Plan, any  trust
       created thereunder, nor any trustee or administrator thereof, has engaged
       in  a transaction in connection with which  RSI, any ERISA Plan, any such
       trust, or any trustee or administrator thereof, or any party dealing with
       any ERISA Plan or any such trust,  could be subject to either a  material
       civil penalty assessed pursuant to Section 502(i) of ERISA, or a material
       tax imposed by Section 4975 of the Code; (iii) full payment has been made
       of all amounts which RSI is required to pay under the terms of each ERISA
       Plan  as a  contribution to  such ERISA Plan  as of  the last  day of the
       fiscal year of  each such  ERISA Plan  ended prior  to the  date of  this
       Agreement,  and no  ERISA Plan nor  any trust  established thereunder has
       incurred any "accumulated funding deficiency" (as defined in Section  302
       of  ERISA and Section 412 of the Code),  whether or not waived, as of the
       last day of the most recent fiscal year of each ERISA Plan ended prior to
       the date of this Agreement; (iv) as to each ERISA Plan which is  intended
       to  be qualified under  Section 401(a) and  501(a) of the  Code, to RSI's
       knowledge there is no fact, condition or set of circumstances that  would
       adversely  affect the  qualified status  of any  such ERISA  Plan; (v) to
       RSI's knowledge  each Plan  has  been operated  and administered  in  all
       material  respects in accordance with its  terms and all applicable laws,
       including but not  limited to  ERISA; (vi) there  are no  pending or,  to
       RSI's  knowledge, threatened  or anticipated material  claims against any
       Plan or any  fiduciary thereof,  by any employee  or beneficiary  covered
       under  any  Plan, or  otherwise involving  any  Plan (other  than routine
       claims for benefits)  and there are  no pending or,  to RSI's  knowledge,
       threatened  or anticipated claims by or on  behalf of any Plan; and (vii)
       there is no liability or penalty under ERISA or otherwise relating to the
       Plans which  would have  a  material adverse  effect on  RSI's  financial
       condition.

    Section 3.14  LITIGATION.

        3.14.1   LITIGATION PENDING OR  THREATENED.  Except as  set forth in the
    Disclosure Letter:  (i)  there  are no  claims,  actions,  suits,  hearings,
    arbitrations,  disputes,  proceedings  (public or  private)  or governmental
    investigations pending or, to the knowledge of RSI, threatened, against RSI,
    at law or in  equity, before or  by any Federal,  state, municipal or  other
    governmental  or  nongovernmental  department,  commission,  board,  bureau,
    agency, court or other instrumentality, or by any private person or  entity,

                                      A-13
<PAGE>
    which  seek  damages,  contributions,  expenditures  or  other  penalties of
    $25,000 or more; (ii) to RSI's knowledge, there is no basis for any  action,
    suit  or  proceeding which,  if successful,  would,  individually or  in the
    aggregate, have  a  material  adverse  effect  on  the  assets,  results  of
    operations  or financial condition  of RSI; and (iii)  there are no existing
    or, to the knowledge of RSI, threatened, orders, judgments or decrees of any
    court or governmental agency to which RSI is subject or which are materially
    affecting RSI.

        3.14.2  THIS TRANSACTION.  Except as set forth in the Disclosure  Letter
    there  are  no legal,  administrative, arbitration  or other  proceedings or
    governmental investigations pending, or, to the knowledge of RSI threatened,
    against RSI which seek to enjoin or rescind the transactions contemplated by
    this Agreement or otherwise  prevent RSI from complying  with the terms  and
    provisions of this Agreement.

    Section  3.15  INSURANCE.   The Disclosure Letter sets  forth (i) a true and
correct list  of  all  insurance  policies of  any  kind  or  nature  whatsoever
maintained  by  RSI,  indicating the  type  of  coverage, name  of  insured, the
insurer, the  premium, the  expiration date  of each  policy and  the amount  of
coverage,  and (ii) a general description of RSI's self-insurance practices. The
policies of insurance and practices  of self-insurance as so described  evidence
insurance  against  all risks  of a  character and  in such  amounts as  RSI has
determined is prudent  and to  RSI's knowledge  are usually  insured against  by
similarly  situated companies in the same or similar business as RSI, and all of
such insurance policies are in full force and effect and will remain so until at
least thirty (30) days after the Closing Date. RSI will notify COMSAT in writing
within 15 days of the date hereof whether it has any reason to believe that  the
policies  of  insurance currently  in effect  and  held by  RSI and  all pending
claims, rights or causes  of action made  or held by RSI  under any policies  of
insurance  will not transfer by operation of law to the Surviving Corporation in
the Merger.

    Section 3.16  PERMITS; COMPLIANCE; REPORTS; CLEARANCES.

        3.16.1    NECESSARY  PERMITS.     RSI  holds  all  material   approvals,
    authorizations,  certificates, consents, licenses, orders and permits of all
    governmental agencies, whether  Federal, state  or local,  necessary to  the
    operation  of its business,  or for its  owned and leased  real and personal
    property in  the  manner  currently  operated  by  RSI,  including,  without
    limitation,  all  necessary  permits  and  approvals  for  the  discharge of
    by-products and waste material into a public waste discharge system, and all
    such material approvals,  authorizations, certificates, consents,  licenses,
    orders and permits are in full force and effect.

        3.16.2   FCC  LICENSES.  The  Disclosure Letter  identifies all licenses
    granted by  the Federal  Communications  Commission to  RSI. RSI  holds  all
    licenses  required by  the Communications Act  of 1934, as  amended, and the
    rules and regulations promulgated thereunder, necessary for the operation of
    its business as presently conducted.

        3.16.3  COMPLIANCE WITH LAW.  To RSI's knowledge, the operations of  RSI
    as  presently conducted do  not violate in any  material respect any Federal
    law (including, without limitation,  any that relate  to health and  safety,
    individual  disabilities,  environmental protection  and  pollution control,
    sale and distribution of products and services, anti-competitive  practices,
    collective  bargaining, equal opportunity and  improper or corrupt payments)
    or  any  foreign,  state,  local   or  other  laws,  statutes,   ordinances,
    regulations,  or  any  order,  writ,  injunction  or  decree  of  any court,
    commission, board, bureau, agency or instrumentality.

        3.16.4   FCPA.   RSI is  in  full compliance  with the  Foreign  Corrupt
    Practices  Act, as amended, 15 U.S.C. SectionSection 78m, 78dd-1, 78dd-2 and
    78ff (the "FCPA"), and no pending  contracts, bids or proposals of RSI  were
    obtained or made in violation of the FCPA.

        3.16.5    REPORTS.   All material  reports,  documents and  notices (not
    relating to Taxes or Tax Returns  as defined in Subsection 3.20.2)  required
    to  be filed, maintained or furnished with or to all governmental regulatory
    authorities, including,  without limitation,  all Federal,  state and  local
    governmental  authorities have  been so  filed, maintained  or furnished. To
    RSI's knowledge all such reports, documents and notices are true and correct
    in all material respects as  of the dates when  legally required to be  true
    and correct (and all required amendments and updates have been made) and, to
    the  extent required to be  kept in the public  inspection files of RSI, are
    kept in such files.

                                      A-14
<PAGE>
        3.16.6  CLEARANCES.   To  the extent  permitted by  law, the  Disclosure
    Letter  sets forth all security clearances held by RSI and personal security
    clearances held by officers, directors or  employees of RSI with respect  to
    the operation of RSI's business.

    Section 3.17  GOVERNMENT CONTRACTS.

        3.17.1   GOVERNMENT CONTRACTS COMPLIANCE.   RSI is not, and consummation
    of this Agreement and the transactions contemplated hereby will not  result,
    in any material violation, breach or default of any term or provision of (i)
    any  contract, subcontract or agreement between the United States Government
    and RSI or (ii) any  bid, proposal or quote  submitted to the United  States
    Government  by RSI. RSI is  not, and consummation of  this Agreement and the
    transactions contemplated hereby will not  result, in any violation,  breach
    or  default in any material  respect of any provision  of any Federal order,
    statute, rule  or  regulation  governing  any  contract,  subcontract,  bid,
    proposal,  quote, arrangement or transaction of  any kind between the United
    States  Government  and  RSI.  The  representations  in  the  two  foregoing
    sentences of this Subsection 3.17.1 are made after consideration of, but are
    not  limited to, the following  laws, regulations, standards, and agreements
    to the  extent,  if  any,  they  are  applicable  to  or  incorporated  into
    contracts,  subcontracts, agreements, bids, proposals  or quotes of RSI: (a)
    The Truth in Negotiations Act of 1962, as amended; (b) The Service  Contract
    Act  of 1965, as amended; (c) The Contract Disputes Act of 1978, as amended;
    (d)  The  Federal   Acquisition  Regulations  and   any  applicable   agency
    supplements   thereto,  as   well  as   applicable  predecessor  procurement
    regulations; (e)  The Cost  Accounting Standards;  (f) Agreements  with  the
    Defense Contract Audit Agency; (g) Relevant rules and arrangements governing
    the  allowance of costs  charged to overhead  and general and administrative
    cost pools allocable to government  contracts; (h) The Byrd Amendment,  Pub.
    L.  No.  101-121, Section  319  (September 23,  1989);  and (i)  The Defense
    Industrial Security Manual (DOD 5220.22-M), the Defense Industrial  Security
    Regulation (DOD 5220.22-R) and related security regulations. With respect to
    bids  or proposals by RSI for contracts covered by P.L. 87-653, all required
    "cost or  pricing  data"  provided  to the  United  States  Government  were
    current,  accurate, and complete when  price negotiations were concluded and
    price agreement reached.

        3.17.2  INVESTIGATIONS  AND CLAIMS.   The Disclosure  Letter sets  forth
    descriptions  of  all  audit  reports,  final  decisions,  determinations of
    noncompliance, claims,  consent  orders  in  effect,  outstanding  Forms  1,
    ongoing    Government   investigations   or    prosecutions,   or   internal
    investigations  conducted  by  or  initiated  by  RSI  and  identifies   any
    corrective  action, restitution or disciplinary action initiated or taken by
    RSI relating in  any sense to  the subjects listed  below in paragraphs  (a)
    through (g) of this Subsection 3.17.2. Except as set forth in the Disclosure
    Letter,  RSI has not  engaged in and  has not been  charged with, received a
    claim related to, or been under investigation or conducted or initiated  any
    internal  investigation, or  had reason to  conduct, initiate  or report any
    internal investigation or made a voluntary disclosure, with regard to any of
    the following,  within the  past  five (5)  years: (a)  "defective  pricing"
    within  the  meaning of  P.L.  87-653, as  amended;  (b) Failure  to correct
    accounting, inventory, material  requirements planning, material  management
    and  accounting systems,  government property records,  or purchasing system
    deficiencies; (c) Mischarging of direct and/or indirect costs in  connection
    with  U.S. Governmental contracts or subcontracts;  (d) Delivery to the U.S.
    Government or  to a  U.S.  Government prime  or subcontractor  of  material,
    components,  items or  services that  do or  did not  meet specifications or
    standards therefor,  or  delivery  to  the U.S.  Government  or  to  a  U.S.
    Government  prime or  subcontractor of foreign-made  material, components or
    items where domestic-made material, components  or items were required;  (e)
    Improper  payments or  any payments  or activities  for obtaining non-public
    source selection information; (f)  Unallowable costs, including  unallowable
    direct  or indirect costs; (g) Violations  of any of the following statutes,
    as amended, or the regulations promulgated thereunder: (i) False  Statements
    Act  (18 U.S.C. 1001),  (ii) False Claims  Act (18 U.S.C.  287), (iii) False
    Claims Act  (31 U.S.C.  3729),  (iv) Bribery,  Gratuities and  Conflicts  of
    Interest  (18 U.S.C.  201), (v) Anti-Kickback  Act (41 U.S.C.  51, 54), (vi)
    Anti-Kickback Enforcement  Act  of 1986  (P.L.  99-634), (vii)  Arms  Export
    Control  Act (22 U.S.C.  277 et seq.), (viii)  Foreign Corrupt Practices Act
    (15 U.S.C.  78 m,  78 dd-1,  78 ff),  (ix) Export  Administration Act  (P.L.
    99-64),  (x) War  and National Defense  Act (18 U.S.C.  793), (xi) Racketeer
    Influenced  and  Corrupt  Organizations  Act  (18  U.S.C.  1901-68),   (xii)
    Conspiracy to Defraud

                                      A-15
<PAGE>
    the  Government (18  U.S.C. 371),  (xiii) Program  Fraud Civil  Remedies Act
    (Pub. L. No. 99-509), (xiv) "Revolving Door" Legislation (18 U.S.C. 207,  18
    U.S.C.  218, 18 U.S.C. 281 (a)(11), 10  U.S.C. 2397, ET SEQ.) 37 U.S.C. 801,
    41 U.S.C. 423, (xv) Defense Production Act (50 U.S.C. App. 2061), (xvi)  The
    Byrd  Amendment, Pub. L.  No. 101-121, 319 (September  23, 1989), and (xvii)
    U.S. antiboycott laws (the  Ribicoff Amendment to the  1976 Tax Reform  Act,
    and the 1979 Export Administration Act).

        3.17.3    NO DEBARMENT  OR SUSPENSION.    RSI has  not been  debarred or
    suspended or, to RSI's  knowledge, informed that it  will be subject to  any
    proceeding  contemplating possible debarment  or suspension from contracting
    with the U.S. Government.

        3.17.4  TEST AND  INSPECTION RESULTS.  All  test and inspection  results
    RSI  has  provided  to  any government  agency  pursuant  to  any government
    contract or subcontract or as a part of the delivery to the U.S.  Government
    of  any article or  system designed, engineered or  manufactured by RSI were
    true, complete and correct except where any inaccuracy or omission does  not
    or  will not have  a material adverse  effect on the  results of operations,
    business, assets  or  financial  condition  of RSI.  RSI  has  provided  all
    material  test and inspection results to  government agencies as required by
    law or  pursuant to  the terms  of the  applicable government  contracts  or
    subcontracts, or as may have been required by law or government contracts or
    subcontracts  as a part of the delivery  to the government of any article or
    system RSI designed, engineered or manufactured.

    Section 3.18   PRODUCT WARRANTIES.   RSI has provided  COMSAT and CTS  true,
correct  and complete copies of the currently used standard forms and statements
of product warranties and guaranties adopted by RSI with respect to any  product
or  service provided prior to Closing. RSI reasonably believes that its reserves
for product warranty and other post-sale services reflected on its  consolidated
financial statements at and subsequent to June 30, 1993 are adequate.

    Section 3.19  ENVIRONMENTAL PROTECTION.

        3.19.1   ENVIRONMENTAL PERMITS.  Except where the failure to do so would
    not have a material  adverse effect on its  business or operations, RSI  has
    obtained  all permits, licenses and  other authorizations which are required
    under Federal,  state,  local and  foreign  laws relating  to  pollution  or
    protection  of  the  environment,  including  laws  relating  to  emissions,
    discharges, releases  or threatened  releases of  pollutants,  contaminants,
    chemicals,  or industrial, toxic or hazardous  substances or wastes into the
    environment (including,  without  limitation, ambient  air,  surface  water,
    ground  water, land surface  or subsurface strata)  or otherwise relating to
    the  manufacture,   processing,  distribution,   use,  treatment,   storage,
    disposal,  transport or handling of  pollutants, contaminants, chemicals, or
    industrial, toxic or hazardous substances or wastes or any regulation, code,
    plan, order, decree, judgment, injunction,  notice or demand letter  issued,
    entered, promulgated or approved thereunder including without limitation the
    following  statutes, as amended, (i) Resource Conservation and Recovery Act,
    42 U.S.C. Section 6901 ("RCRA"); (ii) Comprehensive Environmental  Response,
    Compensation  and Liability Act  of 1980, 26 U.S.C.  Section 4611; 42 U.S.C.
    Section 9601; (iii)  Superfund Amendments  and Reauthorization  Act of  1984
    ("Superfund");  (iv) Clean  Air Act, 42  U.S.C. Section 7401;  (v) The Clean
    Water Act, 33 U.S.C. Section 1251;  (vi) Safe Drinking Water Act, 42  U.S.C.
    Section 300f; and (vii) Toxic Substances Control Act, 15 U.S.C. Section 2601
    (collectively,  the "Environmental  Laws"). The  Disclosure Letter  will set
    forth  prior  to  Closing   (i)  all  such   permits,  licenses  and   other
    authorizations issued under the Environmental Laws obtained by RSI, and (ii)
    a  description  and  good faith  estimate  by  RSI of  the  cost  of capital
    expenditures (if any) that may be necessary to maintain or qualify for  each
    such permit, license or other authorization.

        3.19.2   NO VIOLATION.   RSI is  in compliance in  all material respects
    with all  terms  and  conditions  of  the  required  permits,  licenses  and
    authorizations,  and RSI also is in compliance in all material respects with
    all other  limitations, restrictions,  conditions, standards,  requirements,
    schedules  and timetables contained or referenced by or in the Environmental
    Laws. Any single  omission or act  of non-compliance shall  be deemed to  be
    "material" under this Subsection 3.19.2 if such omission or act would result
    in  any liabilities for RSI or the Surviving Corporation equal to or greater
    than One Hundred Thousand Dollars ($100,000),  and all omissions or acts  of
    non-compliance shall be deemed to be

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<PAGE>
    "material"  under  this  Subsection  3.19.2 if  the  aggregate  of  all such
    omissions or acts would result in  any liabilities for RSI or the  Surviving
    Corporation   equal  to  or  greater  than  Five  Hundred  Thousand  Dollars
    ($500,000).

        3.19.3  CERTAIN MATTERS.  Except as set forth in the Disclosure  Letter,
    no  properties  or  facilities  owned  or  leased  by  RSI  contain  any (i)
    underground  tanks  as   defined  by  any   Environmental  Law  except   for
    fully-inspectable  vault tanks, (ii) to RSI's knowledge, any polychlorinated
    biphenyls ("PCB")  or PCB  contaminated  electrical equipment  except  light
    ballasts,  and (iii) to RSI's knowledge,  any friable structural asbestos or
    asbestos-containing material.

        3.19.4  NO LITIGATION OR PROCEEDINGS.  With respect to or affecting RSI,
    its  business  or  operations,  there  is  no  pending  civil  or   criminal
    litigation, notice of violation or administrative proceeding relating in any
    way to the Environmental Laws including, but not limited to, notices, demand
    letters,  claims, litigations or  proceedings based upon  or relating to any
    Environmental Law, where such  litigation, notice or  claim could result  in
    any  liability  to  RSI or  the  Surviving  Corporation in  excess  of Fifty
    Thousand Dollars ($50,000).

        3.19.5  NO NOTICE.   Except as set forth  in the Disclosure Letter,  RSI
    has   no  knowledge  of  any  threatened  or  potential  civil  or  criminal
    litigation, notice of violation or administrative action relating in any way
    to the Environmental Laws and involving RSI, its business or operations.

        3.19.6  NO BASIS FOR LIABILITY.  To the knowledge of RSI, except as  set
    forth  in  the  Disclosure Letter,  with  respect  to RSI,  its  business or
    operations, there are no past or present events, conditions,  circumstances,
    activities,  practices, incidents, actions or plans which may interfere with
    or prevent continued compliance  with the Environmental  Laws, or which  may
    give  rise to any common law or legal liability, or otherwise form the basis
    of  any  claim,  action,  demand,  suit,  proceeding,  hearing,  study,   or
    investigation,   based  on  or  related   to  the  manufacture,  processing,
    distribution, use, treatment, storage,  disposal, transport or handling,  or
    the emission, discharge, release or threatened release into the environment,
    of  any pollutant, contaminant, chemical,  or industrial, toxic or hazardous
    substance or waste, including, without limitation, any liability arising, or
    any claim, action, demand, suit, proceeding, hearing, study or investigation
    which may be brought under any Environmental Laws.

        3.19.7  NO EXPENDITURES.  To the  knowledge of RSI, except as set  forth
    in  the Disclosure Letter, with respect  to RSI, its business or operations,
    there  are  no  past  or  present  conditions,  circumstances,   activities,
    practices,  incidents, actions or plans which  may interfere with or prevent
    continued compliance with the Environmental  Laws, which may require RSI  to
    make  any capital or other expenditures to comply with any Environmental Law
    existing as  of Closing,  nor is  there any  reasonable basis  on which  any
    governmental  or regulatory body or agency  could take any action that would
    require any such capital or other expenditures.

    Section 3.20  TAXES.

        3.20.1  REPRESENTATION.  Except as  set forth in the Disclosure  Letter,
    to  RSI's  knowledge: (i)  the  reserves reflected  on  RSI's June  30, 1993
    consolidated statement of financial position are sufficient for the  payment
    of  all unpaid Taxes of RSI whether  or not disputed for all periods through
    the date thereof or based on any state of facts existing on or prior to June
    30, 1993; (ii) there has  been no audit by  the Internal Revenue Service  or
    any state, local or foreign tax authority of any Tax Return of RSI resulting
    in  a proposed, asserted or  assessed deficiency, there is  no audit that is
    not closed, and  there are no  outstanding agreements or  waivers signed  or
    agreed  to by RSI extending the statutory period of limitation applicable to
    any Taxes or  Tax Return;  (iii) there  are no  outstanding deficiencies  or
    claims  for Taxes asserted or threatened against  RSI; (iv) RSI has duly and
    timely filed all Tax Returns  required to be filed  by it (all such  returns
    being  true, correct and complete in  all material respects) with the United
    States, the United Kingdom, and the states of California, Virginia, Georgia,
    Texas, Florida, New Jersey, Illinois and West Virginia; (v) with respect  to
    Tax  Returns not referenced in (iv) above, RSI has duly and timely filed all
    Tax Returns required to be filed by it (all such returns being true, correct
    and complete  in  all material  respects);  (vi)  none of  the  Tax  Returns
    referred    to   in    clauses   (iv)    and   (v)    above   contain,   and

                                      A-17
<PAGE>
    RSI has never  filed with  or provided to  the Internal  Revenue Service,  a
    disclosure  statement  with respect  to any  member of  the RSI  Group under
    Section 6662 of the  Code (or any predecessor  statute); (vii) RSI has  duly
    paid  or set aside reserves or otherwise  made provisions for the payment of
    all Taxes attributable to the periods covered by the Tax Returns  referenced
    in  (iv) and  (v) above;  (viii) there  are no  liens with  respect to Taxes
    (except statutory liens for Taxes not yet due or delinquent) upon any of the
    assets of RSI; (ix) all  Taxes required to be  collected or withheld by  RSI
    have  been duly collected or withheld and timely paid to the appropriate tax
    authorities; (x) no payments made or that may, as a result of the Merger, be
    made by RSI (expressly  excluding any payments  made pursuant to  agreements
    entered  into after the Merger or arrangements offered by CTS, COMSAT or any
    of their affiliates) will be treated as excess parachute payments within the
    meaning of Section 280G of the Code; and (xi) no member of the RSI Group has
    applied for a ruling relating to Taxes from any taxing authority or  entered
    into  any closing agreement with any taxing authority which could affect any
    member of  the  RSI Group;  PROVIDED,  HOWEVER,  that with  respect  to  the
    representations set forth in (i), (v), (vii) and (ix), above, any failure or
    failures  on the part  of RSI with  respect to any  such representation will
    constitute a breach of such representation only if such failure or  failures
    would,  in the  aggregate, have a  material adverse effect  on the business,
    results of operations or financial condition of RSI.

        3.20.2   DEFINITIONS.   As  used  herein, "Taxes"  and  all  derivations
    thereof  means any federal, state, local  or foreign income, gross receipts,
    license, payroll, employment, excise, severance, stamp, occupation, premium,
    windfall profits, environmental, customs, duties, capital stock,  franchise,
    profits,   withholding,   social   security   (or   similar),  unemployment,
    disability, real  property,  personal  property,  sales,  use,  AD  VALOREM,
    transfer,   registration,  value  added,   alternative  or  add-on  minimum,
    estimated, or  other tax  of any  kind whatsoever,  including any  interest,
    penalty,  or addition thereto  with respect to  which any member  of the RSI
    Group could  be  held liable.  The  term  "Tax Returns"  shall  include  all
    federal,   state,  local  and  foreign  returns,  declarations,  statements,
    reports, schedules, and information  returns required to  be filed with  any
    taxing  authority in connection with any Tax  or Taxes. The term "RSI Group"
    means RSI and  every member of  an affiliated group  (as defined in  Section
    1504  (without regard  to Section  1504(b)) of  the Code,  provided that for
    purposes of this  Section 3.20, references  to provisions of  the Code  also
    include references to comparable provisions of state, local, or foreign law)
    which includes RSI or which has included any RSI subsidiary.

    Section  3.21  NO BROKERS.  RSI has  not paid or become obligated to pay any
fee or commission to any broker, finder, investment banker or other intermediary
in connection with the transactions  contemplated by this Agreement, other  than
Alex. Brown.

    Section  3.22    PROXY  STATEMENT;  REGISTRATION  INFORMATION.    The  proxy
statement ("Proxy Statement")  including any amendments  or supplements  thereto
with  respect to the special meeting of RSI shareholders contemplated by Section
5.1 herein will comply as to form  in all material respects with the  applicable
provisions of the Securities Exchange Act of 1934, as amended, 15 U.S.C. Section
78,  and the rules and regulations  promulgated thereunder (the "Exchange Act"),
and the information supplied by RSI for inclusion by COMSAT in the  Registration
Statement  (as  defined  in  Section 4.4  herein)  including  any  amendments or
supplements thereto with respect  to the COMSAT Stock  to be issued pursuant  to
the  Merger, will comply as to form in all material respects with the applicable
provisions of the Securities Act of 1933, as amended, 15 U.S.C. Section 77,  and
the  rules and  regulations promulgated  thereunder (the  "Securities Act"), and
neither the Proxy Statement nor the information provided by RSI for inclusion in
the Registration Statement will, on the date of filing thereof with the SEC,  on
the  date of dissemination thereof to holders of  RSI Stock or at any time prior
to the special meeting of RSI  shareholders contemplated by Section 5.1  herein,
as  the case may be, contain any untrue  statement of a material fact or omit to
state a material fact  required to be  stated therein or  necessary to make  the
statements  made therein,  in light  of the  circumstances under  which they are
made, not misleading; PROVIDED, HOWEVER,  that the foregoing representation  and
warranty  shall not  include or  relate to  any information  either furnished by
COMSAT for the  Proxy Statement or  contained in COMSAT's  filings with the  SEC
(other  than the information  provided by RSI for  inclusion in the Registration
Statement) and  which,  in  either  such  case,  is  included,  incorporated  by
reference  or referred to in the  Proxy Statement or the Registration Statement.
If at  any  time  prior  to  the  Effective  Date  any  event  relating  to  RSI

                                      A-18
<PAGE>
should  occur which is required to be described in an amendment of or supplement
to the Registration  Statement or  the Proxy  Statement, RSI  shall promptly  so
inform  COMSAT  and  will prepare,  or  cooperate  in the  preparation  of, such
amendment or supplement.

    Section 3.23  CERTAIN STOCK OWNERSHIP.  RSI does not own any COMSAT Stock or
any options or other arrangements to acquire COMSAT Stock.

    Section 3.24    MATERIAL  DISCLOSURES.    No  statement,  representation  or
warranty made by RSI in this Agreement, in any Exhibit hereto, in the Disclosure
Letter,  or  in  any certificate,  written  statement, list,  schedule  or other
document delivered or to be delivered  to COMSAT or CTS hereunder, contains  any
untrue statement of a material fact, or fails to state a material fact necessary
to   make  the  statements  contained  herein   or  therein,  in  light  of  the
circumstances in which they are made, not misleading.

                                   ARTICLE IV
                REPRESENTATIONS AND WARRANTIES OF COMSAT AND CTS

    COMSAT and CTS hereby jointly and severally represent and warrant to RSI, as
of the date hereof, and as of the Closing Date, as follows:

    Section 4.1   ORGANIZATION.    COMSAT is  a corporation  duly  incorporated,
validly  existing  and  in good  standing  under  the laws  of  the  District of
Columbia. CTS is a corporation duly  incorporated, validly existing and in  good
standing under the laws of the State of Delaware.

    Section 4.2  CORPORATE AUTHORIZATION.

        4.2.1   AUTHORITY.  Each of COMSAT  and CTS have all requisite corporate
    power and  authority  to  enter  into and  perform  this  Agreement  and  to
    consummate  the transactions contemplated hereby. The execution and delivery
    of this Agreement,  the performance by  COMSAT and CTS  of their  respective
    obligations  hereunder and the consummation of the transactions contemplated
    hereby have been duly authorized by  COMSAT's and CTS's Boards of  Directors
    and no other corporate proceedings are necessary to authorize this Agreement
    and  the transactions contemplated hereby. Assuming the valid authorization,
    execution and delivery of this Agreement  by RSI, this Agreement is a  valid
    and binding obligation of COMSAT and CTS, enforceable in accordance with its
    terms,   except   as   limited   by   applicable   bankruptcy,   insolvency,
    reorganization, moratorium or other laws of general application referring to
    or affecting  enforcement  of creditor's  rights,  or by  general  equitable
    principles.

        4.2.2   NO BREACH OR VIOLATION.   Execution, delivery and performance of
    this Agreement  by  COMSAT and  CTS  and consummation  of  the  transactions
    contemplated  hereby will not cause a violation, breach or default or result
    in the termination of, or accelerate the performance required by, or  result
    in  the creation or imposition of any  Encumbrance on any property or assets
    of COMSAT or CTS, whether  by notice or lapse of  time or both or  otherwise
    conflict with any term or provision of the following:

           (a)  Their respective  Articles or  Certificate of  Incorporation and
       By-laws, as amended;

           (b) Any note, bond, mortgage or indenture to which COMSAT or CTS is a
       party or is bound (i) where such violation, breach, default, termination,
       acceleration or Encumbrance would have  a material adverse effect on  the
       business,  results of operations or financial condition of COMSAT and its
       subsidiaries, considered  as  a  whole,  or (ii)  as  to  which  required
       consents, amendments or waivers shall not have been obtained by COMSAT or
       CTS  prior  to  the  Closing  for  any  such  violation,  breach, default
       termination, acceleration or Encumbrance; or

           (c) Any court or administrative order, writ or injunction or process,
       or any consent decree to which COMSAT or  CTS is a party or is bound  (i)
       where  such  violation,  breach,  default,  termination,  acceleration or
       Encumbrance would have a material adverse effect on the business, results
       of operations  or financial  condition of  COMSAT, or  (ii) as  to  which
       required  consents, amendments or waivers shall not have been obtained by
       COMSAT prior  to the  Closing for  any such  violation, breach,  default,
       termination, acceleration or Encumbrance.

                                      A-19
<PAGE>
    Section  4.3  SEC FILINGS.  COMSAT has  furnished to RSI a true and complete
copy of (i) each final prospectus and definitive proxy statement filed by COMSAT
with the SEC since December 31, 1992, and each report on Form 10-K, 8-K or  10-Q
(and  any amendments thereto)  filed by COMSAT  with the SEC  since December 31,
1992 (collectively, the "COMSAT SEC Documents"). All of the COMSAT SEC Documents
complied as  to form  in all  material  respects with  the published  rules  and
regulations of the SEC with respect thereto and none of the COMSAT SEC Documents
as  of the dates they were filed with the SEC contained any untrue statements of
a material  fact or  omitted to  state a  material fact  required to  be  stated
therein  or necessary in order  to make the statements  therein, in light of the
circumstances under which they were made, not misleading in each case as of  the
date when made.

    Section  4.4  REGISTRATION  STATEMENT; PROXY INFORMATION.   The Registration
Statement ("Registration  Statement") including  any amendments  or  supplements
thereto  with respect to the issuance of the COMSAT Stock pursuant to the Merger
contemplated by  Section 5.2  herein will  comply  as to  form in  all  material
respects   with  the  applicable  provisions  of  the  Securities  Act  and  the
information supplied  by COMSAT  for inclusion  by RSI  in the  Proxy  Statement
including  any amendments  or supplements  thereto with  respect to  the special
meeting of RSI shareholders contemplated by Section 5.1 herein will comply as to
form in all  material respects with  the applicable provisions  of the  Exchange
Act,  and neither  the Registration  Statement nor  the information  provided by
COMSAT for inclusion in the Proxy Statement will, on the date of filing  thereof
with the SEC, on the date of dissemination thereof to holders of RSI Stock or at
any  time  prior to  the  special meeting  of  RSI shareholders  contemplated by
Section 5.1  herein, as  the case  may be,  contain any  untrue statement  of  a
material  fact or omit to state a material fact required to be stated therein or
necessary to make  the statements made  therein, in light  of the  circumstances
under which they are made, not misleading; PROVIDED, HOWEVER, that the foregoing
representation  and  warranty shall  not include  or  relate to  any information
either furnished by  RSI for the  Registration Statement or  contained in  RSI's
filings with the SEC (other than information provided by COMSAT for inclusion in
the  Proxy Statement) and which, in  either such case, is included, incorporated
by reference  or  referred  to  in  the  Registration  Statement  or  the  Proxy
Statement.  If at  any time prior  to the  Effective Date any  event relating to
COMSAT should occur  which is required  to be  described in an  amendment of  or
supplement  to the Proxy  Statement or the  Registration Statement, COMSAT shall
promptly so inform  RSI and will  prepare, or cooperate  in the preparation  of,
such amendment or supplement.

    Section  4.5  CAPITALIZATION.  The  total authorized capital stock of COMSAT
is 100,000,000 shares of common stock,  without par value, and 5,000,000  shares
of  preferred stock, without par  value, of which, as  of December 31, 1993, (a)
40,226,475 shares of common stock were  validly issued and outstanding and  were
fully paid and nonassessable and free of preemptive rights, (b) 2,521,780 shares
of  common  stock were  subject  to issuance  upon  the exercise  of outstanding
options or warrants, and  (c) 1,348,003 shares of  common stock were issued  and
held  in treasury.  Other than  1,019,350 options  and 222,000  restricted stock
awards granted between December  31, 1993 to the  date of this Agreement,  there
are  no other  issued and  outstanding or issued  and not  outstanding shares of
capital stock of COMSAT, or any  other securities which are convertible into  or
exercisable for capital stock of COMSAT.

    Section  4.6  COMSAT STOCK.  Upon issuance as contemplated by this Agreement
or pursuant to the exercise of options into which the RSI Options were converted
pursuant to Section  5.10 herein, each  share of COMSAT  Stock shall be  validly
issued,  fully paid and nonassessable, and free and clear of any liens, pledges,
mortgages or encumbrances.

    Section 4.7    NO BROKERS.    Neither COMSAT  nor  CTS has  paid  or  become
obligated  to pay any fee or commission to any broker, finder, investment banker
or other intermediary in connection  with the transactions contemplated by  this
Agreement, other than Goldman, Sachs & Co.

    Section 4.8  MATERIAL DISCLOSURES.  No statement, representation or warranty
made  by COMSAT  or CTS  in this  Agreement, in  any Exhibit  hereto, or  in any
certificate, written statement, list, schedule or other document delivered or to
be delivered to RSI hereunder, contains any untrue statement of a material fact,
or fails to  state a material  fact necessary to  make the statements  contained
herein  or therein, in  light of the  circumstances in which  they are made, not
misleading.

                                      A-20
<PAGE>
                                   ARTICLE V
                                   COVENANTS

    Section 5.1  SHAREHOLDER MEETING.   RSI will call  a special meeting of  its
shareholders  to be  held as  promptly as  practicable (but  no earlier  than 30
business days after the  date hereof) for the  purpose of obtaining  shareholder
approval of this Agreement and the Merger. COMSAT will cooperate with RSI in the
preparation  and filing  with the  SEC as promptly  as practicable  of the Proxy
Statement for such special meeting, and  will cooperate in the prompt filing  of
such  amendments  or supplements  to the  Proxy Statement  as may  be reasonably
requested by the SEC or  its staff in order to  comply in all material  respects
with  the Exchange Act. The Proxy  Statement shall include the recommendation of
the Board of Directors of RSI  that the RSI shareholders approve this  Agreement
and  authorize the Merger, unless such  recommendation shall have been withdrawn
in the exercise of the fiduciary duties of the RSI Board of Directors to the RSI
shareholders under the Nevada Corporation Law.  RSI shall have no obligation  to
mail the Proxy Statement to its shareholders until the Registration Statement is
declared effective by the SEC, as contemplated by Section 5.2 herein.

    Section  5.2   REGISTRATION STATEMENT.   COMSAT will prepare  as promptly as
practicable the  Registration Statement  on Form  S-4 for  the issuance  of  the
COMSAT  Stock as contemplated  hereunder, and RSI will  cooperate with COMSAT in
its  preparation.  Subject  to  Section  5.13  herein,  COMSAT  will  file   the
Registration  Statement  with  the SEC  and  shall use  all  reasonable efforts,
including  the  filing  of  amendments   with  respect  thereto,  to  have   the
Registration  Statement  declared  effective by  the  SEC, and  to  maintain the
effectiveness  of  the  Registration  Statement  through  the  Effective   Date,
including  the filing of any post-effective amendments thereto as may reasonably
be requested by the SEC  staff or as otherwise  required by the Securities  Act.
COMSAT shall also take any action required to be taken under state "Blue Sky" or
securities  laws in connection with the offering  of the COMSAT Stock to the RSI
shareholders and the issuance of the COMSAT Stock pursuant to the Merger.

    Section 5.3   AFFILIATES' LETTERS.   As soon as  practicable after the  date
hereof,  RSI shall  deliver to  COMSAT a  list of  names and  addresses of those
persons who are, to the  knowledge of RSI, reasonably  anticipated to be at  the
time  of RSI's special meeting of  stockholders convened pursuant to Section 5.1
hereof, "affiliates" of RSI  within the meaning of  Rule 145 (each such  person,
together  with the persons identified below, being hereinafter referred to as an
"Affiliate") promulgated under the  Securities Act ("Rule  145"). RSI shall  use
its  best efforts  to provide  COMSAT such  information and  documents as COMSAT
shall reasonably request  for purposes of  reviewing such list.  There shall  be
added  to such  list the  names and  addresses of  any other  person (within the
meaning of Rule 145)  which COMSAT reasonably identifies  (by written notice  to
RSI  within three business days after COMSAT's  receipt of such list) as being a
person who may be deemed  to be an Affiliate of  RSI within the meaning of  Rule
145;  PROVIDED, HOWEVER, that no such person identified by COMSAT shall be added
to the list of Affiliates of RSI if COMSAT shall receive from RSI, on or  before
the  Effective Date, an opinion of  counsel reasonably satisfactory to COMSAT to
the effect that such person is not an Affiliate. RSI shall use its best  efforts
to  deliver or cause  to be delivered to  COMSAT, at least 30  days prior to the
anticipated date of RSI's  special meeting, from each  of the Affiliates of  RSI
identified in the foregoing list (as the same may be supplemented as aforesaid),
a  letter dated  as of  the Effective  Date in  the form  of Exhibit  E attached
hereto.

    Section 5.4  ACQUISITION PROPOSALS.  RSI  shall not (nor will it permit  any
of  its officers, directors, agents or affiliates to) directly or indirectly (i)
solicit, encourage, initiate or participate  in any negotiations or  discussions
with respect to any offer or proposal to acquire all or substantially all of its
business and properties or capital stock, whether by merger, purchase of assets,
tender  offer or  otherwise, or  (ii) except  as contemplated  by this Agreement
disclose any information not customarily disclosed to any person concerning  its
business  and  properties,  afford  to  any  person  or  entity  access  to  its
properties, books or  records or  otherwise assist  or encourage  any person  or
entity in connection with any of the activities referred to in clause (i) above;
UNLESS in the case of either clause (i) or (ii) above, RSI shall have received a
firm written offer relating to such transaction, not conditioned upon financing,
from  a reputable  buyer, which  offer, in the  written opinion  of Alex. Brown,
RSI's financial advisers, appears to be  on terms financially superior to  those

                                      A-21
<PAGE>
offered  by the  transactions contemplated by  this Agreement and  which, in the
written opinion of legal counsel to  RSI reasonably acceptable to COMSAT,  RSI's
Board  of Directors is legally obligated  to consider by principles of fiduciary
duty to shareholders under the Nevada Corporation Law.

    Section 5.5   HSR ACT FILINGS.   COMSAT  and RSI shall  promptly make  their
respective  filings, and shall thereafter promptly make any required submissions
or responses to  second requests  for information,  under the  Hart-Scott-Rodino
Antitrust  Improvements Act of 1976, as amended, 15 U.S.C. Section 18a (the "HSR
Act"), with  respect to  the Merger  and shall  cooperate with  each other  with
respect to the foregoing.

    Section  5.6  CONSENTS.  Each of COMSAT and RSI agrees to use all reasonable
efforts  expeditiously  to  (i)  obtain  all  actions,  non-actions,   consents,
authorizations,  orders  and  approvals  from Federal,  state,  local  and other
governmental and regulatory bodies, and from  third parties, as may be  required
in   connection  with,  and  waivers  of  any  violations,  breaches,  defaults,
accelerations,  terminations  or  Encumbrances  that  may  be  caused  by,   the
consummation  of  the  Merger or  the  other transactions  contemplated  by this
Agreement and the Merger, including the facilities clearance requirements of the
Defense Investigative  Service  of  the  United  States  Department  of  Defense
("DIS"),  as set forth in the DIS Industrial Security Regulation (DOD 5220.22-4)
and the DIS Industrial Security Manual  (DOD 5220.22-M), as may be amended  from
time  to  time,  and (ii)  resolve  favorably  any action,  suit,  proceeding or
investigation which shall have  been instituted or  which a governmental  agency
shall  have indicated its  intention to institute  which could lead  to an order
making the Merger unlawful.

    Section 5.7  INTERIM OPERATIONS OF RSI.  During the period from the date  of
this Agreement through the Effective Date, RSI shall operate its businesses only
in the usual and ordinary course and consistent with past practice and shall use
all  reasonable efforts  to (i)  preserve intact  its business  organization and
goodwill in all material respects, (ii)  keep available the services of its  key
officers  and employees  and (iii)  maintain its  relationships with significant
customers,  suppliers,  distributors  and  others  having  significant  business
relationships  with it, and, subject to the provisions of this Agreement, except
as mutually agreed to in writing by COMSAT, RSI shall not (A) amend or otherwise
change its Restated Articles of Incorporation or Bylaws; (B) other than pursuant
to outstanding option or  other agreements or commitments  existing at June  30,
1993,  issue, sell or authorize for issuance or sale, shares of any class of its
securities (including, without limitation, by way of stock split or dividend) or
any subscriptions, options,  warrants, rights, convertible  securities or  other
agreements  or  commitments  of  any  character  obligating  it  or  any  of its
subsidiaries to  issue  such  securities,  or  directly  or  indirectly  redeem,
purchase  or otherwise  acquire any of  its securities; (C)  declare, set aside,
make or  pay any  dividend or  other  distribution (whether  in cash,  stock  or
property)  with respect to its capital  stock other than its regular semi-annual
cash dividends,  which  in each  case  shall not  be  greater than  the  highest
semi-annual  cash dividend paid to its shareholders during its fiscal year ended
June 30, 1993; (D) make any acquisitions  or any dispositions other than in  the
ordinary course of business; (E) guarantee employment to or commit to retain any
Employee after the Closing Date; (F) take any action that would cause the Merger
not  to qualify  as a reorganization  within the  meaning of Section  368 of the
Code; or (G) take any action that could result in the Merger not being accounted
for by the pooling of interests method for financial reporting purposes.

    Section 5.8  INTERIM OPERATIONS OF COMSAT.  Commencing from the date of this
Agreement and through the  Effective Date and thereafter,  COMSAT shall not  (i)
take  any action that would cause the  Merger not to qualify as a reorganization
within the meaning  of Section 368  of the Code,  or (ii) take  any action  that
could  result in the Merger not being  accounted for by the pooling of interests
method for financial reporting purposes.

                                      A-22
<PAGE>
    Section  5.9  ACCESS.  Subject to reasonable notice and as permitted by law,
RSI shall afford  to COMSAT and  its accountants, counsel  and other agents  and
representatives  full access during normal  business hours throughout the period
prior to  the  Effective  Date  to all  of  its  properties,  books,  contracts,
commitments  and records and, during such  period, RSI shall furnish promptly to
COMSAT and its  representatives (i) a  copy of each  report, schedule and  other
document  filed or  received by  it pursuant to  the requirements  of Federal or
state securities laws, and (ii) access  to all other information concerning  its
business,  properties and personnel  as COMSAT may  reasonably request, provided
that no investigation pursuant to this Section 5.9 shall affect or be deemed  to
modify  any representation or warranty contained herein or the conditions to the
obligations of  the  parties to  consummate  the Merger.  Without  limiting  the
generality  of the foregoing, RSI shall permit COMSAT and its representatives to
conduct a "Phase I"  and "Phase II" environmental  audit on properties owned  or
leased  by RSI or any  RSI Subsidiary, including the  taking of soil samples and
the sinking of  monitoring wells at  COMSAT's expense, and  will cooperate  with
COMSAT  and its  representatives in any  environmental investigation  it or they
reasonably deem  appropriate  in  the circumstances.  RSI  shall  promptly  upon
request  provide COMSAT and  CTS access to  a complete and  correct copy of each
written  agreement  or  other  instrument,  together  with  all  amendments   or
clarifications  thereto,  and  a true  and  complete  summary of  the  terms and
conditions of each oral agreement, identified in the Disclosure Letter  pursuant
to  Subsection 3.12.1  or relied  upon by  RSI in  compiling and  disclosing its
backlog pursuant to Subsection 3.8.1. If access  is restricted due to a term  in
the  agreement or by applicable law or  regulation, RSI shall use all reasonable
efforts to secure consent from the other party(ies) to the Agreement to  provide
such  access prior to  Closing with sufficient  time for COMSAT  and CTS review.
COMSAT will treat the documents and  other material and information referred  to
in  this Section 5.9  which constitute "Confidential  Information" as defined in
the Confidentiality Agreement between COMSAT and RSI dated January 16, 1994 (the
"Confidentiality Agreement") as  "Confidential Information"  in accordance  with
the  terms of  the Confidentiality  Agreement. For  purposes of  this Agreement,
material and information supplied in connection with a "Phase II"  environmental
audit shall be treated as "Confidential Information."

    Section 5.10  RSI OPTIONS.

        5.10.1   NO ACCELERATION.   RSI shall  not, from the  date hereof to the
    close of business on  the Effective Date, take  any action to accelerate  or
    agree  or  commit to  accelerate the  vesting  of any  options or  rights to
    acquire RSI Stock (the "RSI  Options"); PROVIDED HOWEVER, that any  unvested
    RSI  Options which shall automatically vest on  or prior to the Closing Date
    in accordance with the terms by which options were granted, and without  any
    further  action on the part of RSI,  shall so vest and become exercisable in
    accordance with such terms.

        5.10.2  CONVERSION TO COMSAT OPTIONS.   At the close of business on  the
    Effective  Date,  each outstanding  RSI Option  shall  be converted  into an
    option to acquire that number of shares of COMSAT Stock in an amount and  at
    an exercise price determined as provided below and otherwise having the same
    duration and other terms as the original RSI Option:

           (a)  The number of  shares of COMSAT  Stock to be  subject to the new
       option shall be equal to the product of the number of shares of RSI Stock
       subject to  the  original  RSI  Option  times  the  Conversion  Fraction;
       provided  that any  fractional shares resulting  from such multiplication
       shall be rounded down to the nearest share; and

           (b) The  exercise price  per share  for COMSAT  Stock under  the  new
       option  shall be equal to the product of the per share exercise price for
       RSI Stock under the original RSI Option times the number, rounded to  the
       nearest  thousandth,  obtained  by  dividing one  (1)  by  the Conversion
       Fraction; provided that such  exercise price shall be  rounded up to  the
       nearest cent.

        5.10.3   PLANS AND REGISTRATION.   The Board of  Directors of COMSAT, or
    the appropriate committee thereof, shall, under the terms of the COMSAT 1990
    Key Employee Stock Plan, cause the options converted pursuant to  Subsection
    5.10.2  herein, other than  any RSI Option  held by directors  of RSI, to be
    assumed under such plan, and COMSAT shall, if such shares are not  otherwise
    registered, file a registration statement on Form S-8 (or any successor form
    thereto) with respect to the shares of

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<PAGE>
    COMSAT  Stock underlying such options.  COMSAT shall, if reasonably required
    to permit  resale  without restrictions  other  than those  contemplated  by
    Section  5.3, file  a registration statement  on Form S-8  (or any successor
    form thereto) with respect to shares of COMSAT Stock underlying RSI  Options
    held by directors of RSI.

    Section  5.11  NYSE LISTING.   COMSAT shall use  its best efforts to obtain,
prior to  the  Effective  Date, approval  for  listing  on the  New  York  Stock
Exchange,  upon official notice  of issuance, of  the COMSAT Stock  to be issued
pursuant to the Merger.

    Section 5.12  DISCLOSURE LETTER.  RSI  shall deliver to COMSAT an update  of
the  Disclosure Letter  prior to Closing  with time sufficient  for COMSAT's and
CTS's review.

    Section 5.13  INTERIM REVIEW.  COMSAT may, in its sole discretion and at its
expense, retain  Deloitte &  Touche  to conduct  a  review of  the  consolidated
financial  statements of RSI  at December 31,  1993. RSI shall  cooperate in any
such review and shall use its best efforts to cause such review to be  completed
prior to the filing by COMSAT of the Registration Statement with the SEC. COMSAT
shall  be under no  obligation to file  the Registration Statement  with the SEC
unless and until such review has been completed.

    Section 5.14   CONFIDENTIALITY.   RSI  will treat  all documents  and  other
material   and  information   furnished  to   it  by   COMSAT  which  constitute
"Confidential Information"  as  defined  in  the  Confidentiality  Agreement  as
"Confidential  Information" in accordance with  the terms of the Confidentiality
Agreement.

    Section 5.15  NOTICE.  COMSAT agrees to notify RSI promptly upon COMSAT, CTS
or its authorized representatives having  received actual knowledge, as part  of
COMSAT's  due  diligence  review  of  RSI,  of  a  material  breach  of  an  RSI
representation or  warranty made  herein,  to the  extent  RSI has  not  already
disclosed  such material  breach to COMSAT  or the material  breach is otherwise
open and notorious.

    Section 5.16  ESOP; CERTAIN BENEFITS.  Simultaneously with the execution and
delivery of this Agreement, COMSAT is  executing and delivering to the Board  of
Directors  of RSI  the letter  attached hereto as  Exhibit F  concerning the RSI
Employee Stock Ownership Plan and certain  other benefits for the employees  and
directors of RSI.

    Section  5.17  FURTHER ASSURANCES.  Each of the parties hereto agrees to use
all reasonable efforts to take, or cause to  be taken, all action and to do,  or
cause  to be  done, all things  necessary, proper or  advisable under applicable
laws and regulations expeditiously to  consummate and make effective the  Merger
and the other transactions contemplated by this Agreement.

                                   ARTICLE VI
             CONDITIONS PRECEDENT TO OBLIGATIONS OF COMSAT AND CTS

    Section  6.1  CONDITIONS.   The obligations of COMSAT  and CTS to consummate
the Merger under this  Agreement shall be subject  to the fulfillment, to  their
reasonable  satisfaction,  on  or prior  to  the  Closing Date,  of  all  of the
following conditions precedent:

        6.1.1  DISCLOSURE LETTER.   As provided under  Section 5.12 herein,  the
    Disclosure Letter shall have been updated to the date closest as practicable
    to  the Closing Date and shall have  been delivered with time sufficient for
    COMSAT's and CTS's review.

        6.1.2  ABSENCE OF CHANGES.  The representations and warranties contained
    in Subsections 3.5.2  and 3.16.4  herein shall be  true and  correct on  the
    Closing  Date. The Disclosure Letter schedule referred to in the penultimate
    sentence in Subsection  3.8.1 shall show  at the Closing  Date an  aggregate
    contract  backlog  for RSI  in all  categories of  at least  $118,500,000 as
    required by Subsection 3.8.1.

        6.1.3   NO ADVERSE  FACTS  REVEALED.   No  audit, investigation  or  due
    diligence review by COMSAT or its representatives of RSI with respect to the
    representations and warranties contained in Article III, shall have revealed
    in  the aggregate liabilities of RSI not previously disclosed as of the date
    hereof

                                      A-24
<PAGE>
    (whether then existing or  arising after the date  hereof) which exceed  the
    product of five percent (5%) multiplied by (i) $18.25 and (ii) the number of
    shares  of  RSI common  stock issued  and  outstanding on  the date  of this
    Agreement.

        6.1.4  HSR ACT WAITING  PERIOD.  All waiting  periods under the HSR  Act
    with respect to the Merger shall have been terminated or expired.

        6.1.5  PERFORMANCE BY RSI.  RSI shall have performed and complied in all
    material respects with all agreements, covenants, obligations and conditions
    required  by this Agreement  to be performed  or complied with  by RSI on or
    before the Closing Date.

        6.1.6  OBTAINING OF DIS CONSENTS AND APPROVALS.  RSI shall have obtained
    and delivered to COMSAT all necessary  consents, approvals or waivers on  or
    prior  to  the  Closing Date  as  required  pursuant to  the  DIS Industrial
    Security Regulation, DOD 5220.22-R, and  the DIS Industrial Security  Manual
    DOD  5220.22-M (as either may be amended from time to time), for the purpose
    of retaining any necessary facilities clearances and/or personnel clearances
    as the case may be after the Closing Date.

        6.1.7  OBTAINING OF CONSENTS AND APPROVALS.  RSI shall have executed and
    delivered to  COMSAT  and CTS,  or  shall have  caused  to be  executed  and
    delivered,   any   consents,  waivers,   approvals,  permits,   licenses  or
    authorizations which, if not obtained on or prior to the Closing Date, would
    have a material  adverse effect  on the Surviving  Corporation's ability  to
    conduct business as conducted by RSI on the Closing Date.

        6.1.8   ABSENCE OF LITIGATION.   There shall not  be in effect any order
    enjoining or restraining  the transactions contemplated  by this  Agreement,
    and there shall not be instituted or pending any action or proceeding before
    any  Federal,  state  or  foreign  court  or  governmental  agency  or other
    regulatory or  administrative  agency  or  instrumentality  challenging  the
    Merger  or  the issuance  of the  COMSAT Stock  in connection  therewith, or
    otherwise seeking to restrain or  prohibit consummation of the  transactions
    contemplated   by  this  Agreement,  or   seeking  to  impose  any  material
    limitations on any provision of this Agreement.

        6.1.9  AUTHORIZATION OF MERGER.  The requisite shareholders of RSI shall
    have duly voted their  shares approving this  Agreement and authorizing  the
    Merger.

        6.1.10   POOLING.  COMSAT shall have received an opinion from Deloitte &
    Touche, dated the  Closing Date,  that the  Merger as  contemplated by  this
    Agreement  will be  accounted for  as a  pooling of  interests for financial
    reporting purposes.

        6.1.11  EMPLOYMENT AGREEMENT.  RSI  shall have used its best efforts  to
    cause,  on or prior  to the Closing  Date, Richard E.  Thomas to execute and
    deliver  an   Employment   Agreement   (the   "Employment   Agreement")   in
    substantially the form of Exhibit G attached hereto.

        6.1.12   RSI OFFICERS' CERTIFICATES.  COMSAT and CTS shall have received
    certificates,  dated  the  Closing  Date,  executed  on  behalf  of  RSI  by
    appropriate  officers, stating  that the representations  and warranties set
    forth in Article III hereof are true and correct on the Closing Date (unless
    specified to be made  as of another  date, in which  case on such  specified
    date) in all material respects and that the conditions set forth in Sections
    6.1.1 through 6.1.9.

        6.1.13   COMFORT LETTER.   COMSAT and CTS shall  have received a letter,
    dated as  of a  date not  more than  two days  prior to  the date  that  the
    Registration  Statement  is declared  effective, and  shall have  received a
    subsequent letter, dated as of  a date not more than  two days prior to  the
    Effective  Date,  from  Deloitte  &  Touche,  independent  auditors  of RSI,
    addressed to COMSAT  and CTS, to  the effect that  (i) they are  independent
    accountants  within the meaning of the  Securities Act and the Exchange Act;
    (ii) in  their opinion,  the financial  statements of  RSI included  in  the
    Registration  Statement comply as to form  in all material respects with the
    applicable accounting requirements  of the Securities  Act and the  Exchange
    Act,  (iii) on  the basis of  limited procedures specified  in their letter,
    which need not  constitute an  audit, nothing  has come  to their  attention
    which would give them reason to believe that

                                      A-25
<PAGE>
    (A)  since December 31, 1993, to the date  of such letter there has been any
    increase in the outstanding capital stock or rights, securities, options  or
    obligations  exercisable for or convertible into shares of capital stock, or
    in the consolidated indebtedness, of RSI,  (B) there has been any change  in
    specified  balance sheet  items of  RSI since  the date  of the  most recent
    financial statements included  in the Registration  Statement and the  Proxy
    Statement  or (C) since December 31, 1993  to the date of such letter, there
    has been  any  decrease in  the  net income  of  RSI as  compared  with  the
    corresponding  period for  the prior  year, except  with respect  to each of
    clauses (A), (B) and (C) for any such increase, change or decrease  referred
    to  in or contemplated by the Registration Statement and the Proxy Statement
    or specified in such letter.

        6.1.14  OPINION OF RSI'S COUNSEL.   RSI shall have furnished COMSAT  and
    CTS  with an opinion  of Shaw, Pittman, Potts  & Trowbridge, special counsel
    for RSI, dated the Closing Date, substantially in the form of Exhibit H.

        6.1.15  OTHER DOCUMENTS.  The  execution and delivery to COMSAT and  CTS
    by  RSI of such other certificates,  documents and instruments as COMSAT may
    reasonably request.

    Section 6.2  WAIVER.  COMSAT and CTS may, at their sole discretion, waive in
writing fulfillment of any or all of the conditions set forth in Section 6.1  of
this  Agreement, provided that such waiver granted by COMSAT and CTS pursuant to
this Section  6.2 shall  have no  effect upon  or as  against any  of the  other
conditions  not so  waived. To the  extent that  at the Closing  RSI delivers to
COMSAT a written notice  specifying in reasonable detail  the failure of any  of
such conditions or the breach by RSI of any of the representations or warranties
of  RSI herein, and nevertheless COMSAT  proceeds with the Closing, COMSAT shall
be deemed to have  waived for all  purposes any rights or  remedies it may  have
against  RSI or,  except in the  case of fraud  or gross negligence,  any of its
directors, officers or employees by reason of the failure of any such conditions
or the breach of any such representations or warranties to the extent  described
in   such  notice.  Following   the  Closing,  no  claims   for  breach  of  any
representations, warranties or agreements shall be brought against any  director
or  officer,  or  any employee  listed  in  the Disclosure  Letter  as providing
"knowledge" with  respect to  RSI's  representations and  warranties as  of  the
Closing  Date  as  referenced  in  clause  (ii)  of  the  last  sentence  in the
introductory paragraph in Article III, if and to the extent such person did  not
have  actual knowledge  or had  no reason  to know  (in light  of circumstantial
evidence made available to them on or prior to Closing) of the facts material to
such breach of any representation, warranty or agreement.

                                  ARTICLE VII
                   CONDITIONS PRECEDENT TO OBLIGATIONS OF RSI

    Section 7.1  CONDITIONS.   The obligations of  RSI to consummate the  Merger
under  this  Agreement  herein  shall  be subject  to  the  fulfillment,  to its
reasonable satisfaction,  on  or  prior to  the  Closing  Date, of  all  of  the
following conditions precedent:

        7.1.1   HSR ACT WAITING  PERIOD.  All waiting  periods under the HSR Act
    with respect to the Merger shall have been terminated or expired.

        7.1.2  PERFORMANCE BY COMSAT AND CTS.  Each of COMSAT and CTS shall have
    performed and  complied  in  all  material  respects  with  all  agreements,
    covenants,  obligations  and conditions  required  by this  Agreement  to be
    performed or complied with by COMSAT and CTS on or before the Closing Date.

        7.1.3   OBTAINING OF  DIS CONSENTS  AND APPROVALS.   COMSAT  shall  have
    obtained  and delivered to RSI all  necessary consents, approvals or waivers
    on or prior to the Closing Date  as required pursuant to the DIS  Industrial
    Security  Regulation. DOD 5220.22-R, and  the DIS Industrial Security Manual
    DOD 5220.22-M (as either may be amended from time to time), for the  purpose
    of retaining any necessary facilities clearances and/or personnel clearances
    as the case may be after the Closing Date.

        7.1.4   OBTAINING OF CONSENTS AND APPROVALS.   COMSAT and CTS shall have
    executed and  delivered to  RSI, or  shall have  caused to  be executed  and
    delivered, any consents, waivers, approvals,

                                      A-26
<PAGE>
    permits,  licenses or authorizations  which, if not obtained  on or prior to
    the Closing Date,  would have  a material  adverse effect  on the  Surviving
    Corporation's ability to conduct business as conducted by RSI on the Closing
    Date.

        7.1.5   POOLING.   RSI  shall have received  an opinion  from Deloitte &
    Touche, dated the  Closing Date,  that the  Merger as  contemplated by  this
    Agreement  will be  accounted for  as a  pooling of  interests for financial
    reporting purposes.

        7.1.6  ABSENCE OF LITIGATION.   There shall not  be in effect any  order
    enjoining or restraining the transactions contemplated by this Agreement.

        7.1.7  REGISTRATION STATEMENT; NYSE LISTING.  The Registration Statement
    shall  have become  effective under  the Securities  Act prior  to the first
    mailing of the Proxy Statement to  shareholders of RSI and the  Registration
    Statement  shall,  at the  date of  the meeting  of RSI  shareholders called
    pursuant to Section 5.1 of this Agreement and at all times thereafter to and
    including the  Effective  Date,  have  been  effective  and  no  stop  order
    suspending  the  effectiveness thereof  shall have  been issued  during such
    period and not withdrawn and no stop order shall be pending at the Effective
    Date. The COMSAT Stock to be issued  pursuant to the Merger shall have  been
    approved for listing on the New York Stock Exchange, upon official notice of
    issuance.

        7.1.8  AUTHORIZATION OF MERGER.  The requisite shareholders of RSI shall
    have  duly voted their  shares approving this  Agreement and authorizing the
    Merger.

        7.1.9  OFFICERS'  CERTIFICATES.  RSI  shall have received  certificates,
    dated the Closing Date, executed on behalf of COMSAT by appropriate officers
    stating  that the  representations and  warranties set  forth in  Article IV
    hereof are true and correct on the Closing Date (unless specified to be made
    as of another date, in  which case on such  specified date) in all  material
    respects  and that the conditions set  forth in Sections 7.1.1 through 7.1.8
    hereof have been satisfied.

        7.1.10  OTHER DOCUMENTS.   The execution and  delivery to RSI by  COMSAT
    and  CTS of  such other certificates,  documents and instruments  as RSI may
    reasonably request.

        7.1.11  OPINION OF  COMSAT'S COUNSEL.  COMSAT  shall have furnished  RSI
    with  the opinion of Crowell & Moring, special counsel for COMSAT, dated the
    Closing Date, substantially in the form of Exhibit I.

    Section 7.2   WAIVER.  RSI  may, in  its sole discretion,  waive in  writing
fulfillment  of any or  all of the conditions  set forth in  Section 7.1 of this
Agreement, provided that such waiver granted pursuant to this Section 7.2  shall
not constitute a waiver by RSI of any other conditions not so waived.

                                  ARTICLE VIII
                                  TERMINATION

    Section  8.1  TERMINATION EVENTS.  Subject to the provisions of Section 8.2,
this Agreement may, by written notice given  at or prior to the Closing (in  the
manner  provided  by Section  9.9 herein)  be terminated  and abandoned  only as
follows:

        8.1.1   BREACH.   By  either COMSAT  or RSI  upon  written notice  if  a
    material  default or breach shall be made  by the other, with respect to the
    due and timely performance of any of the other party's respective  covenants
    and  agreements contained herein, or with respect to the due compliance with
    any of the other party's respective representations and warranties contained
    in Article III or IV herein, as applicable, and such default cannot be cured
    prior to Closing and has not been waived;

        8.1.2  MUTUAL CONSENT.  By mutual written consent of the parties hereto;
    or

        8.1.3  FAILURE OF CONDITIONS TO CLOSE.   By either COMSAT or RSI, if  by
    reason  of  failure of  their respective  conditions  to close  contained in
    Article VI or VII herein, as  applicable, and such conditions have not  been
    satisfied  or waived  by December  31, 1994,  or such  later date  as may be
    agreed upon by the parties hereto, PROVIDED THAT the right to terminate this
    Agreement under this Subsection 8.1.3 shall not

                                      A-27
<PAGE>
    be available to a party whose  failure to fulfill any obligation or  perform
    any  covenant under this Agreement has been  the cause of or resulted in the
    failure of any of the conditions to close of the other party hereto by  such
    date.

        Section  8.2   EFFECT OF  TERMINATION.  In  the event  this Agreement is
    terminated  pursuant  to  Section  8.1   herein,  all  further  rights   and
    obligations  of the parties hereunder shall  terminate, PROVIDED THAT if RSI
    at any time prior to December 31, 1994 is acquired by, merges, effectuates a
    business combination with, or sells substantially  all of its assets to  any
    person  or  entity not  controlled by  COMSAT, or  agrees to  do any  of the
    foregoing, RSI shall immediately upon such action or agreement pay to COMSAT
    Five Million  Dollars ($5,000,000),  plus all  of COMSAT's  costs, fees  and
    expenses  incurred  in  connection with  this  Agreement and  the  Merger as
    contemplated  hereby,  including  fees  and  expenses  of  its  accountants,
    investment advisers and counsel, and PROVIDED FURTHER that the total payment
    RSI  shall pay to COMSAT immediately upon such action or agreement shall not
    in  any  event   exceed  Seven  Million,   Five  Hundred  Thousand   Dollars
    ($7,500,000).

    Section  8.3  FEES AND  EXPENSES; DAMAGES.  Except  as otherwise provided in
Section 8.2 herein, in the event this Agreement is terminated for any reason and
the Merger is not consummated each party shall be responsible for its own costs,
fees and expenses, including  fees and expenses  of its accountants,  investment
advisers  and counsel, PROVIDED,  HOWEVER, that if the  termination is caused by
the breach of COMSAT and CTS on the one hand, or the breach of RSI on the  other
hand,  the breaching  party(ies) shall  pay to  the non-breaching  party(ies) as
liquidated damages (and as its sole  and exclusive remedy) the actual costs  and
expenses of the non-breaching party(ies), including the fees and expenses of its
accountants,  investment advisers  and counsel, not  to exceed  Two Million Five
Hundred Thousand Dollars ($2,500,000).

                                   ARTICLE IX
                                 MISCELLANEOUS

    Section 9.1  CONSTRUCTION.

        9.1.1  WORDS.   All references in this  Agreement to the singular  shall
    include  the plural  where applicable,  and all  references to  gender shall
    include both genders and neuter.

        9.1.2  CROSS-REFERENCES.   References in this  Agreement to any  Article
    shall  include  all Sections,  Subsections and  Paragraphs in  such Article;
    references in this Agreement  to any Section  shall include all  Subsections
    and  Paragraphs in  such Section;  and references  in this  Agreement to any
    Subsection shall include all Paragraphs in such Subsection.

        9.1.3  NO PRESUMPTION.  In interpreting any provision of this  Agreement
    no presumption shall be drawn against the party drafting the provision.

        9.1.4    HEADINGS.   Article, Section  and  Subsection headings  of this
    Agreement are for convenience only  and are not to  be construed as part  of
    this  Agreement or as defining or limiting in any way the scope or intent of
    the provisions hereof.

        9.1.5  EXHIBITS.  Exhibits and the Disclosure Letter referred to  herein
    are hereby incorporated into and made a part of this Agreement. Any material
    disclosed in any part of the Disclosure Letter shall be deemed disclosed for
    purposes  of all of  the representations and warranties  of RSI contained in
    Article III herein.

        9.1.6  TIME.  Time  shall be of the essence  in the performance of  each
    party's respective obligations under this Agreement.

    Section  9.2  SEVERABILITY.   If any  part of this  Agreement for any reason
shall be declared invalid,  such decision shall not  affect the validity of  any
remaining portion, which shall remain in full force and effect.

                                      A-28
<PAGE>
    Section  9.3   FURTHER  ASSURANCES.   Each  party shall  at its  own expense
furnish, execute and deliver such documents, instruments, certificates,  notices
or  other  further  assurances as  the  other  party may  reasonably  require as
necessary or appropriate to effect the purposes of this Agreement or to  confirm
the rights created or arising hereunder.

    Section  9.4  BENEFIT.  Unless otherwise  specified herein, no person who is
not a  party to  this Agreement  shall have  any rights  or derive  any  benefit
hereunder.  No provision of this Agreement  except Exhibit G shall constitute an
agreement of employment.

    Section 9.5   SCOPE  AND MODIFICATION.   This  Agreement, the  Stock  Option
Agreement,  and  Sections  1 through  4  and  Section 7  of  the Confidentiality
Agreement, constitute the entire agreement between the parties and supersede all
prior oral or written agreements (including the Confidentiality Agreement except
as specifically referenced in this Section 9.5) or understandings of the parties
with regard  to  the subject  matter  hereof. No  interpretation,  modification,
termination  or waiver  of any  provision hereof shall  be binding  upon a party
unless in writing and  executed by the other  parties. No modification,  waiver,
termination,  rescission, discharge or cancellation of  any right or claim under
this Agreement shall affect the right of  any party hereto to enforce any  other
claim or right hereunder.

    Section  9.6   DELAYS OR  OMISSIONS.  Except  as expressly  provided in this
Agreement, no delay or omission to exercise any right, power or remedy  accruing
to  a  party hereunder,  upon  any breach  or default  of  any party  under this
Agreement, shall  impair  any such  right,  power or  remedy,  nor shall  it  be
construed  to be  a waiver  of any  such breach  or default,  or an acquiescence
therein, or  a  waiver of  or  acquiescence in  any  similar breach  or  default
thereafter  occurring; nor shall any  waiver of any single  breach or default be
deemed a  waiver  of any  other  breach  or default  theretofore  or  thereafter
occurring.

    Section  9.7  SUCCESSORS AND ASSIGNS.  This Agreement may not be assigned by
any party without the written consent of the other parties. Except as  otherwise
expressly  provided herein, the provisions of  this Agreement shall inure to the
benefit of, and  be binding upon,  the successors and  permitted assigns of  the
parties hereto.

    Section  9.8   GOVERNING LAW.   The terms  and provisions  of this Agreement
shall be interpreted in accordance with and governed by the laws of the State of
Maryland and the United States of America, without giving effect to the doctrine
of conflict of laws.

    Section 9.9  NOTICES.  Any notice  under this Agreement shall be in  writing
and  shall be  delivered by  personal service or  by United  States certified or
registered mail,  with postage  prepaid, or  by facsimile  or overnight  express
courier,  addressed to a party at the address set forth beneath its name, below,
or at such other address  as one party may give  written notice of to the  other
parties.

           (a) If to COMSAT or CTS:

               C. Thomas Faulders, III
                 Vice President and Chief Financial Officer
                 COMSAT Corporation
                 6560 Rock Spring Drive
                 Bethesda, MD 20817
                 Fax: (301) 214-7131

               With a copy to:

               Warren Y. Zeger, Esq.
                 Vice President and General Counsel
                 COMSAT Corporation
                 6560 Rock Spring Drive
                 Bethesda, MD 20817
                 Fax: (301) 214-7128

                                      A-29
<PAGE>
               And to:

               William P. O'Neill, Esq.
                 Crowell & Moring
                 1001 Pennsylvania Avenue, N.W.
                 Washington, D.C. 20004-2505.
                 Fax: (202) 628-5116

           (b) If to RSI:

               Richard E. Thomas
                 Chairman, Chief Executive Officer and President
                 Radiation Systems Inc.
                 1501 Moran Road
                 Sterling, VA 20166
                 Fax: (703) 450-2701

               With a copy to:

               John L. Sullivan, III, Esq.
                 Shaw, Pittman, Potts & Trowbridge
                 1501 Farm Credit Drive
                 Suite 4400
                 McLean, VA 22102-5000
                 Fax: (703) 821-2397

               And to:

               Lynn A. Soukup, Esq.
                 Shaw, Pittman, Potts & Trowbridge
                 2300 N Street, N.W.
                 Washington, D.C. 20037-1128
                 Fax: (202) 663-8007

The  designation of the person(s) to be so notified, or the address or facsimile
of such person(s) for the purposes of  such notice, may be changed from time  to
time  by  means of  a similar  notice.  Copies to  counsel shall  not constitute
notice.

    Section 9.10  DUPLICATES.   This Agreement  may be executed  in one or  more
counterparts, each of which shall constitute an original document.

    Section 9.11  COOPERATION.  The parties shall consult and cooperate with one
another regarding, and shall use their respective reasonable efforts to seek and
obtain,  the  approvals,  consents  and  other  documents  contemplated  by this
Agreement, and shall use  their respective best efforts  to cause the  statutory
and other conditions to their respective obligations hereunder to be satisfied.

    Section 9.12  PUBLIC ANNOUNCEMENTS.  RSI and COMSAT agree that they will not
issue any press release or otherwise make any public statement or respond to any
press  inquiry with respect  to this Agreement  or the transactions contemplated
hereby, without the prior approval of the other party, except as may be required
by law; if any such disclosure is required by law the disclosing party shall use
its best efforts to give notice and an opportunity to consult to the other party
prior to such required disclosure.

                                      A-30
<PAGE>
                             EXECUTION AND DELIVERY

    IN WITNESS  WHEREOF, the  parties hereto  have executed  and delivered  this
Agreement  with the express intent that it be effective, legal and binding as of
the date and year first-above written.

                                          COMSAT CORPORATION

                                          By:        /s/ BRUCE L. CROCKETT

                                          --------------------------------------
                                                 Name: Bruce L. Crockett
                                               Title: President

                                          CTS AMERICA, INC.

                                          By:     /s/ C. THOMAS FAULDERS, III

                                          --------------------------------------
                                                 Name: C. Thomas Faulders, III
                                               Title: President

                                          RADIATION SYSTEMS, INC.

                                          By:        /s/ RICHARD E. THOMAS

                                          --------------------------------------
                                                 Name: Richard E. Thomas
                                               Title: Chairman

                                      A-31
<PAGE>
                                                                       EXHIBIT B

                             STOCK OPTION AGREEMENT

    STOCK  OPTION AGREEMENT dated as of January  30, 1994, by and between COMSAT
CORPORATION, a  District  of  Columbia  corporation  ("COMSAT"),  and  RADIATION
SYSTEMS, INC., a Nevada corporation (the "Company").

    WHEREAS,  the Company, COMSAT and CTS  America, Inc., a Delaware corporation
and a  wholly owned  subsidiary of  COMSAT  ("CTS"), propose  to enter  into  an
Agreement  and  Plan  of  Merger,  dated as  of  the  date  hereof  (the "Merger
Agreement"), which provides, among other things,  upon the terms and subject  to
the  conditions thereof, that the Company will be merged with and into CTS, with
CTS to be the surviving corporation,  and that each outstanding share of  common
stock,  par value $1.00  per share of  the Company (the  "Company Common Stock")
will be converted into the right to receive that fraction of a share, rounded to
the nearest thousandth (the "Conversion Fraction"), of common stock, without par
value, of COMSAT (the  "COMSAT Stock") determined  by dividing Eighteen  Dollars
and  twenty-five cents ($18.25) by the average closing price of a whole share of
COMSAT Stock on the New York Stock  Exchange Composite Tape for the twenty  (20)
Trading Days ending with the Trading Day which precedes the Closing Date by five
(5)  Trading Days  (a "Trading Day"  being any day  on which the  New York Stock
Exchange is open for business and on which shares of COMSAT Stock are traded  on
that  Exchange), provided  that the Conversion  Fraction shall not  be less than
.638 and shall not be greater than .780; and

    WHEREAS, as  a  condition  to  its willingness  to  enter  into  the  Merger
Agreement,  COMSAT has required that  the Company agree, and  in order to induce
COMSAT to enter into the Merger Agreement  the Company has agreed, to grant  the
COMSAT Option (as hereinafter defined).

    NOW  THEREFORE, in consideration  of the foregoing  and the mutual covenants
and agreements set forth herein and in the Merger Agreement, the parties  hereto
agree as follows:

    1.   GRANT OF OPTION.  The Company hereby grants to COMSAT an unconditional,
irrevocable option  (the "COMSAT  Option") to  purchase a  number of  shares  of
Company  Common Stock equal  to Fifteen Percent  (15%) of the  shares of Company
Common Stock outstanding on the date hereof (the "Option Shares") at an exercise
price of Eighteen Dollars and twenty-five  cents ($18.25) per Option Share  (the
"COMSAT Option Exercise Price").

    2.  EXERCISE OF OPTION.  Provided that COMSAT or CTS is not then in material
breach  of its obligations  under the Merger Agreement,  COMSAT may exercise the
COMSAT Option,  in  whole or  in  part,  at any  time,  in the  event  that  any
corporation,  partnership, person, other entity or  group (as defined in Section
13(d)(3) of  the Securities  Exchange Act  of 1934,  as amended  (the  "Exchange
Act")) (collectively, a "Person"), other than COMSAT or any of its subsidiaries,
(i)  acquires beneficial ownership (as such term  is defined in Rule 13d-3 under
the Exchange Act) of at least Fifteen Percent (15%) of the outstanding shares of
Company Common Stock, (ii) enters into an  agreement with the Company or any  of
its material subsidiaries to merge or consolidate with the Company or any of its
subsidiaries, or to purchase all or substantially all of the consolidated assets
of  the Company (or effects any such  merger, consolidation or purchase) and the
Merger Agreement is  terminated, or (iii)  has commenced or  commences (as  such
terms  are defined in  Rule 14d-2 under  the Exchange Act)  a tender or exchange
offer for at least  Fifteen Percent (15%) of  the outstanding shares of  Company
Common  Stock that is  not opposed by the  Company and the  Company is no longer
supporting the Merger  Agreement and the  transactions contemplated thereby.  In
the  event COMSAT wishes  to exercise the COMSAT  Option for some  or all of the
Option Shares, COMSAT  shall send a  written notice to  the Company stating  the
number of Option Shares that it wishes to purchase and setting forth a place and
date  not earlier  than one  nor, subject  to Section  8 herein,  later than ten
business days  from the  date  such notice  is given  for  the closing  of  such
purchase (a "COMSAT Option Closing").

    3.   PAYMENT AND DELIVERY OF CERTIFICATES.   (a) At a COMSAT Option Closing,
COMSAT will make payment to  the Company of the  aggregate price for the  Option
Shares being purchased at the COMSAT

                                      B-1
<PAGE>
Option  Closing by delivery  of immediately available funds  to the Company, and
the Company will deliver  to COMSAT a  certificate or certificates  representing
the Option Shares being so purchased, registered in the name of COMSAT.

        (b)  Certificates for the Option Shares  delivered at each COMSAT Option
    Closing shall  be  endorsed  with  a restrictive  legend  which  shall  read
    substantially as follows:

       THE  TRANSFER OF THE STOCK REPRESENTED  BY THIS CERTIFICATE IS SUBJECT TO
       RESTRICTIONS ARISING UNDER THE  SECURITIES ACT OF  1933, AS AMENDED,  AND
       PURSUANT TO THE TERMS OF A STOCK OPTION AGREEMENT DATED AS OF JANUARY 30,
       1994.  A COPY  OF SUCH  AGREEMENT WILL BE  PROVIDED TO  THE HOLDER HEREOF
       WITHOUT CHARGE UPON RECEIPT BY THE ISSUER OF A WRITTEN REQUEST THEREFORE.

    It is  understood and  agreed that  the  above legend  shall be  removed  by
    delivery  of substitute certificate(s)  without such legend  if COMSAT shall
    have delivered to the Company a copy of a letter from the staff of the  SEC,
    or  an opinion of  counsel in form and  substance reasonably satisfactory to
    the Company and its counsel, to the effect that such legend is not  required
    for purposes of the Securities Act.

    4.   OPTION VALUE.  In the  event that the COMSAT Option becomes exercisable
pursuant to paragraph 2 hereof,  and COMSAT so requests  in lieu of exercise  of
the  COMSAT Option, then the Company shall  promptly, and in no event later than
five (5) business days after receipt of such request, pay to COMSAT an amount in
cash (the "COMSAT Option Value") equal to the product of (x) the excess, if any,
of (A) the highest  price per share  paid or proposed to  be paid in  connection
with any transaction specified in Section 2 or Section 10(b)(ii), as applicable,
herein  for  any  shares of  Company  Common  Stock, or  the  greatest aggregate
consideration paid or  proposed to be  paid in connection  with any  transaction
specified  in  Section 2  or Section  10(b)(ii), as  applicable, herein  for the
purchase of assets of  the Company divided  by the number  of shares of  Company
Common  Stock then outstanding, as the case may  be (the value of any such price
or consideration other than cash to be determined, in the case of  consideration
with  a readily  ascertainable market value,  by reference to  such market value
and, in the case of any other consideration, by agreement in good faith  between
COMSAT  and the Company), over (B)  the COMSAT Option Exercise Price, multiplied
by (y) the  total number  of shares  still subject  to the  COMSAT Option.  Such
payment  shall be made by delivery of  immediately available funds to COMSAT and
shall extinguish all other rights of COMSAT under this Agreement.

    5.   REPRESENTATIONS AND  WARRANTIES OF  THE COMPANY.   The  Company  hereby
represents and warrants to COMSAT as follows:

        (a)  AUTHORITY  RELATIVE  TO  THIS  AGREEMENT.    The  Company  has full
    corporate power and authority to execute  and deliver this Agreement and  to
    consummate  the transactions contemplated hereby. The execution and delivery
    of this  Agreement and  the consummation  of the  transactions  contemplated
    hereby  have been duly and  validly authorized by the  Board of Directors of
    the Company and no  other corporate proceedings on  the part of the  Company
    are  necessary to authorize this Agreement or to consummate the transactions
    so contemplated.  This Agreement  has  been duly  and validly  executed  and
    delivered  by  the  Company  and, assuming  this  Agreement  and  the Merger
    Agreement constitute valid and binding obligations of COMSAT, this Agreement
    constitutes a  valid  and  binding agreement  of  the  Company,  enforceable
    against the Company in accordance with its terms.

        (b) OPTION SHARES.  The Company has taken all necessary corporate action
    to  authorize and reserve and  to permit it to issue,  and at all times from
    the date hereof through the  Termination Date (as hereinafter defined)  will
    have  reserved for issuance upon exercise of  the COMSAT Option, a number of
    shares of  Company Common  Stock equal  to the  number of  Option Shares  to
    permit  the exercise in full of the COMSAT Option, all of which shares, upon
    issuance pursuant hereto,  shall be duly  authorized, validly issued,  fully
    paid and nonassessable, and shall be delivered free and clear of all claims,
    liens, encumbrances and security interests and not subject to any preemptive
    rights.

                                      B-2
<PAGE>
    6.   REPRESENTATIONS AND WARRANTIES OF COMSAT.  COMSAT hereby represents and
warrants to the Company as follows:

        (a) AUTHORITY RELATIVE  TO THIS  AGREEMENT.  COMSAT  has full  corporate
    power  and authority to execute and deliver this Agreement and to consummate
    the transactions contemplated  hereby. The  execution and  delivery of  this
    Agreement  and the consummation of the transactions contemplated hereby have
    been duly and validly authorized by the Board of Directors of COMSAT and  no
    other corporate proceedings on the part of COMSAT are necessary to authorize
    this  Agreement  or to  consummate  the transactions  so  contemplated. This
    Agreement has been duly  and validly executed and  delivered by COMSAT  and,
    assuming  this  Agreement  and  the Merger  Agreement  constitute  valid and
    binding obligations of the Company,  this Agreement constitutes a valid  and
    binding  agreement of COMSAT, enforceable  against COMSAT in accordance with
    its terms.

        (b) DISTRIBUTION.   COMSAT will acquire  the Option Shares  for its  own
    account  and not with a view to any resale or distribution thereof, and will
    not sell  the Option  Shares unless  such shares  are registered  under  the
    Securities  Act  of  1933  or  unless  an  exemption  from  registration  is
    available.

    7.  ADJUSTMENT UPON CHANGES IN CAPITALIZATION.   In the event of any  change
in  the shares of Company Common Stock  by reason of stock dividends, split-ups,
mergers, recapitalizations, combinations,  conversions, exchanges  of shares  or
the  like, the number and kind of shares  of Company Common Stock subject to the
COMSAT Option and the purchase price per share shall be appropriately adjusted.

    8.  CONSENTS.  The Company will use its best efforts to obtain any approvals
and consents, and  otherwise to  satisfy any requirements,  of all  governmental
authorities   and  laws  necessary  to  the  consummation  of  the  transactions
contemplated by this Agreement. The  consummation of such transactions shall  be
subject  to, and, if  delayed pursuant to  this Section 8,  shall occur promptly
after (whether  before  or after  the  Termination  Date) the  receipt  of  such
necessary approvals or consents and satisfaction of such requirements.

    9.    REGISTRATION  RIGHTS;  LISTING.    The  Company  shall,  if reasonably
requested by  COMSAT within  three years  of the  first exercise  of the  COMSAT
Option (or any portion thereof), as expeditiously as possible prepare and file a
registration  statement under the Securities Act regarding the offer and sale or
other disposition  of  any  or all  shares  of  Company Common  Stock  or  other
securities that have been acquired by or are issuable to COMSAT upon exercise of
the  COMSAT  Option in  accordance with  the  intended method  of sale  or other
disposition by COMSAT,  and the Company  shall use its  best efforts to  qualify
such  shares or  other securities  under any  applicable state  securities laws.
COMSAT agrees  to  use  all  reasonable  efforts to  cause,  and  to  cause  any
underwriters  of any sale or disposition to cause, any sale or other disposition
pursuant to such registration statement to  be effected on a widely  distributed
basis  so that  upon consummation thereof  no purchaser or  transferee shall own
beneficially more than 5% of the  then outstanding voting power of the  Company.
The  Company shall use its best efforts  to cause such registration statement to
become effective, to obtain  all consents or waivers  of other parties that  are
required therefor and to keep such registration statement effective for a period
not in excess of 180 days from the day such registration statement first becomes
effective  as  may  be  reasonably  necessary  to  effect  such  sale  or  other
disposition. The obligations  of the  Company hereunder to  file a  registration
statement  and to maintain  its effectiveness may  be suspended for  one or more
periods of time not exceeding 45 days in the aggregate if the Board of Directors
of the Company shall determined that  the filing of such registration  statement
or  the maintenance of  its effectiveness would  require disclosure of nonpublic
information  that  would  materially  and  adversely  affect  the  Company.  Any
registration  statement prepared  and filed under  this Section 9,  and any sale
covered thereby,  shall be  at  the Company's  expense except  for  underwriting
discounts  or  commissions,  brokers' fees  and  the fees  and  disbursements of
COMSAT's  counsel  related  thereto.   COMSAT  shall  provide  all   information
reasonably  requested by the Company for inclusion in any registration statement
to be  filed hereunder.  If during  the time  period referred  to in  the  first
sentence  of  this  Section  9  the Company  effects  a  registration  under the
Securities Act of  Company Common Stock  for its  own account or  for any  other
stockholders  of  the  Company (other  than  on Form  S-4  or Form  S-8,  or any
successor form),  it  shall  allow  COMSAT the  right  to  participate  in  such
registration;  PROVIDED  that, if  the  managing underwriters  of  such offering
advise the Company  in writing that  in their  opinion the number  of shares  of
Company Common

                                      B-3
<PAGE>
Stock requested to be included in such registration exceeds the number which can
be  sold in such offering, the Company  shall include the shares requested to be
included therein by  COMSAT pro  rata with the  shares intended  to be  included
therein  by the Company (and by no  others). In connection with any registration
pursuant to this Section 9, the Company and COMSAT shall provide each other  and
any  underwriter of the offering with the customary representations, warranties,
covenants,  indemnification   and   contribution   in   connection   with   such
registration.  The Company  will use  its best efforts  promptly to  list on the
NASDAQ National Market System  or a national  securities exchange, whichever  is
the  principal  trading market  for  the Company  Common  Stock on  the  date of
exercise of the  COMSAT Option,  upon official  notice of  issuance, the  Option
Shares issued upon exercise of the COMSAT Option.

    10.  TERMINATION; CERTAIN PROTECTION.

        (a)  Except as otherwise contemplated hereby, all the provisions of this
    Agreement shall terminate upon  the date (the  "Termination Date") which  is
    thirty (30) days after the termination of the Merger Agreement.

        (b)  In the  event that  (i) prior to  the Termination  Date any Person,
    other than  COMSAT or  any of  its affiliates,  shall publicly  announce  or
    communicate  to the Company a proposal (A)  to merge or consolidate with the
    Company or any of its subsidiaries, or to purchase all or substantially  all
    of  the assets of  or otherwise to acquire  the Company, or  (B) to make any
    tender or exchange offer for shares of Company Common Stock and (ii)  within
    one  year after  the Termination  Date such Person  or a  related Person (x)
    acquires at least Fifteen Percent (15%) of the outstanding shares of Company
    Common Stock, (y) enters into  an agreement with the  Company or any of  its
    subsidiaries  to  merge  or  consolidate  with the  Company  or  any  of its
    subsidiaries or to purchase  all or substantially all  of the assets of  the
    Company  (or  effects any  such merger,  consolidation  or purchase)  or (z)
    commences a tender  offer or  exchange offer  for at  least Fifteen  Percent
    (15%) of the outstanding shares of Company Common Stock that is supported by
    the Company, then the Company shall promptly pay to COMSAT the COMSAT Option
    Value.

    11.   ASSIGNMENT.   COMSAT  shall not sell,  assign, convey  or transfer the
COMSAT Option  other  than  to  any wholly  owned  subsidiary  of  COMSAT.  This
Agreement  shall  be binding  upon  and inure  to  the benefit  of  each party's
successors and assigns.

    12.   SPECIFIC PERFORMANCE.   The  parties hereto  acknowledge that  damages
would  be  an inadequate  remedy for  a breach  of this  Agreement and  that the
obligations  of   the  parties   hereto  shall   be  specifically   enforceable.
Accordingly,  it is agreed that COMSAT shall be entitled to injunctive relief to
prevent breaches of this  Agreement by the Company  and specifically to  enforce
the terms and provisions hereof, in addition to any other remedy to which it may
be entitled, at law or in equity.

    13.   ENTIRE AGREEMENT.  This  Agreement and the Merger Agreement constitute
the entire agreement among the parties with respect to the subject matter hereof
and supersede all other  prior agreements and  understandings, both written  and
oral,  among  the parties  or any  of them  with respect  to the  subject matter
hereof.

    14.  VALIDITY.  The invalidity or unenforceability of any provision of  this
Agreement  shall  not  affect  the  validity  or  enforceability  of  any  other
provisions of this Agreement, which shall remain in full force and effect.

    15.    NOTICES.     All  notices,  requests,   claims,  demands  and   other
communications  hereunder shall be deemed to have been duly given when delivered
in person,  by registered  or certified  mail (postage  prepaid, return  receipt
requested)  or  by  facsimile  to the  respective  parties  at  their respective
addresses set forth in  the Merger Agreement,  or at such  other address as  the
person  to whom notice is  given may have previously  furnished to the others in
writing in the manner set forth in the Merger Agreement (provided that notice of
any change of address shall be effective only upon receipt thereof).

    16.  GOVERNING LAW.   This Agreement shall be  governed by and construed  in
accordance with the laws of the State of Maryland.

                                      B-4
<PAGE>
    17.  DESCRIPTIVE HEADINGS.  The descriptive headings herein are inserted for
convenience  of reference only and  are not intended to be  part of or to affect
the meaning or interpretation of this Agreement.

    18.   COUNTERPARTS.    This  Agreement  may  be  executed  in  two  or  more
counterparts,  each of which shall be deemed to be an original, but all of which
shall constitute one and the same agreement.

    19.   EXPENSES.   All costs  and expenses  incurred in  connection with  the
transactions contemplated by this Agreement shall be paid by the party incurring
such expenses.

    20.  BENEFIT.  No person who is not a party to this Agreement shall have any
rights or derive any benefit hereunder.

    21.   TRANSFER.  If COMSAT has exercised the COMSAT Option, COMSAT shall not
sell, transfer, pledge, or  hypothecate the Option Shares  except pursuant to  a
bona  fide  third  party offer  (the  "Third  Party Offer"),  and  without first
tendering the Option Shares to the Company  at the price or equivalent value  as
that provided for in the Third Party Offer. Such tender shall be made in writing
and  be held open for  15 days. Notwithstanding the  above, COMSAT shall have no
obligation to tender the Option Shares if  the Third Party Offer is made by  any
member  or members of  a group (as  defined in Section  13(d)(3) of the Exchange
Act) to which COMSAT is also member.

    IN WITNESS WHEREOF,  each of  the parties has  caused this  Agreement to  be
executed  on its behalf by its officers thereunto duly authorized, all as of the
day and year first above written.

                                          COMSAT CORPORATION

                                          By:        /s/ BRUCE L. CROCKETT

                                          --------------------------------------
                                                 Name: Bruce L. Crockett
                                               Title: President

                                          RADIATION SYSTEMS, INC.

                                          By:        /s/ RICHARD E. THOMAS

                                          --------------------------------------
                                                 Name: Richard E. Thomas
                                               Title: Chairman

                                      B-5
<PAGE>
                                                                       EXHIBIT C

                                          January 30, 1994

                                     [LOGO]
Radiation Systems, Inc.
1501 Moran Road
Sterling, Virginia 20166

Dear Sirs:

    Radiation  Systems, Inc. (the "Company"),  Comsat Corporation ("Comsat") and
CTS America, Inc., a Delaware Corporation and wholly-owned subsidiary of  Comsat
("CTS"),  have  proposed entering  into  an Agreement  and  Plan of  Merger (the
"Agreement"). Pursuant to  the Agreement, the  Company will be  merged with  and
into  CTS (the "Merger"), and each then outstanding share of common stock of the
Company (the "Common Stock"), other than  shares held by Comsat or the  Company,
will  be converted into a number of shares of common stock of Comsat obtained by
dividing $18.25 by the average closing price of Comsat common stock, on the  New
York  Stock Exchange Composite Tape, for the  20 trading days (as defined in the
Agreement) ending  5 trading  days before  closing of  the Agreement;  provided,
however,  that the number of  shares shall not exceed .78  nor be less than .638
shares of Comsat for each share of Common Stock. You have requested our  opinion
as  to whether  the consideration to  be received  by the holders  of the Common
Stock pursuant to the Agreement is fair, from a financial point of view, to such
holders.

    Alex. Brown  & Sons  Incorporated, as  a customary  part of  its  investment
banking business, is engaged in the valuation of businesses and their securities
in  connection with mergers and  acquisitions, negotiated underwritings, private
placements and valuations for estate, corporate and other purposes. Alex.  Brown
&   Sons  Incorporated  regularly  publishes   research  reports  regarding  the
telecommunications industry and  the business and  securities of publicly  owned
companies  in that industry. We have acted  as financial advisor to the Board of
Directors of the Company in connection with the transaction described above  and
will  receive a fee for our services, a  portion of which is contingent upon the
consummation of the Agreement.

    In connection with our opinion, we have reviewed certain publicly  available
financial  information concerning  the Company  and Comsat  and certain internal
financial analyses and  other information  furnished to  us by  the Company  and
Comsat.  We have also held discussions with  members of the senior management of
the Company and Comsat regarding the  business and prospects of the Company  and
Comsat.  In  addition,  we have  (i)  reviewed  the reported  price  and trading
activity for the Common Stock of  the Company and Comsat, (ii) compared  certain
financial  and stock market information for  the Company and Comsat with similar
information for  certain  comparable  companies whose  securities  are  publicly
traded,   (iii)  reviewed  the  financial   terms  of  certain  recent  business
combinations which we deemed comparable in whole or in part, and (iv)  performed
such  other studies and analyses and considered  such other factors as we deemed
appropriate.

    We have not independently verified  the information described above and  for
purposes  of this opinion  have assumed the  accuracy, completeness and fairness
thereof. With respect to information relating  to the prospects of the  Company,
we  have assumed  that such  information reflects  the best  currently available
estimates and judgments  of management of  the Company as  to the likely  future
financial  performance  of  the  Company.  In  addition,  we  have  not  made an
independent evaluation or appraisal  of the assets of  the Company, nor have  we
been  furnished with any such  evaluation or appraisal. Our  opinion is based on
market, economic and other conditions as they  exist and can be evaluated as  of
the date of this letter.

                                      C-1
<PAGE>
    Based  upon and subject to the foregoing, it  is our opinion that, as of the
date of this  letter, the consideration  to be  received by the  holders of  the
Common  Stock pursuant to the Agreement is fair, from a financial point of view,
to such holders.

                                          Very truly yours,

                                          /s/ ALEX. BROWN & SONS INCORPORATED

                                          ALEX. BROWN & SONS INCORPORATED

                                      C-2
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

    Reference  is  made to  the provisions  of Article  III of  the registrant's
Articles of Incorporation  filed as Exhibit  4(a) hereto and  the provisions  of
Article VIII of the registrant's By-laws filed as Exhibit 4(b) hereto.

    Section  29-304  of  the  District  of  Columbia  Business  Corporations Act
provides that  a  District of  Columbia  corporation  shall have  the  power  to
indemnify  any  and all  of its  directors  or officers  or former  directors or
officers or any  person who  may have  served at its  request as  a director  or
officer  of another corporation in  which it owns shares  of capital stock or of
which it is  a creditor against  expenses actually and  necessarily incurred  by
them  in connection with the defense of  any action, suit or proceeding in which
they, or any of them, are made parties, or a party, by reason of being or having
been directors or officers or  a director or officer  of the corporation, or  of
such  other corporation,  except in  relation to  matters as  to which  any such
director or officer or former director or officer or person shall be adjudged in
such action, suit or proceeding to be liable for negligence or misconduct in the
performance of duty. Such indemnification shall  not be deemed exclusive of  any
other  rights  to which  those  indemnified may  be  entitled, under  any bylaw,
agreement, vote of stockholders, or otherwise.

    There are in  effect directors' and  officers' liability insurance  policies
which insure the registrant's directors and officers against certain liabilities
that they may incur in such capacities.

ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

    (a) The exhibits listed below are listed according to the number assigned in
the table in Item 601 of Regulation S-K.

<TABLE>
<CAPTION>
  EXHIBIT NO.                                           DESCRIPTION OF EXHIBIT
- ---------------  -----------------------------------------------------------------------------------------------------
<C>              <S>
         2(a)    Agreement  and Plan of  Merger, dated as  of January 30,  1994, by and  among COMSAT Corporation, CTS
                 America, Inc., and Radiation Systems, Inc. (included  as Exhibit A to the Proxy  Statement/Prospectus
                 filed  as part of  this Registration Statement  and incorporated herein  by reference; the Registrant
                 agrees to furnish  supplementally to the  Commission upon request  a copy of  any omitted exhibit  or
                 schedule).
         2(b)    Stock Option Agreement, dated as of January 30, 1994, by and between COMSAT Corporation and Radiation
                 Systems,  Inc.  (included as  Exhibit  B to  the  Proxy Statement/Prospectus  filed  as part  of this
                 Registration Statement and incorporated herein by reference).
         4(a)    Articles of Incorporation of  COMSAT Corporation (composite  copy; as amended  through June 1,  1993)
                 (Incorporated  by  reference to  Exhibit 4(a)  to  Registrant's Registration  Statement on  Form S-3,
                 Commission File No. 33-51661).
         4(b)    By-laws of COMSAT  Corporation (as  amended through  March 15,  1991) (Incorporated  by reference  to
                 Exhibit 3(b) to Registrant's Annual Report on Form 10-K for the fiscal year ended December 31, 1991).
         5       Opinion  of Crowell  & Moring  as to  the legality  of the  Common Stock  to which  this Registration
                 Statement relates.
         8       Opinion of Shaw, Pittman, Potts &  Trowbridge, a partnership including professional corporations,  as
                 to certain federal income tax consequences of the Merger.
        10(a)    Employment  Agreement, dated as  of January 30, 1994,  by and among  COMSAT Corporation, CTS America,
                 Inc., and Richard E. Thomas.
        10(b)    Employment Agreement, dated as  of January 30,  1994, by and among  COMSAT Corporation, CTS  America,
                 Inc., and R. Doss McComas.
        10(c)    Employment  Agreement, dated as  of January 30, 1994,  by and among  COMSAT Corporation, CTS America,
                 Inc., and Marvin D. Shoemake.
</TABLE>

                                      II-1
<PAGE>
<TABLE>
<C>              <S>
        10(d)    Employment Agreement, dated as  of January 30,  1994, by and among  COMSAT Corporation, CTS  America,
                 Inc., and Mark D. Funston.
        10(e)    Employment  Agreement, dated as  of January 30, 1994,  by and among  COMSAT Corporation, CTS America,
                 Inc., and William A. Thomas.
        10(f)    Employment Agreement, dated as  of January 30,  1994, by and among  COMSAT Corporation, CTS  America,
                 Inc., and Anita M. Stutzman.
        10(g)    Letter  Agreement, dated  January 30,  1994, from  COMSAT Corporation  to the  Board of  Directors of
                 Radiation Systems, Inc. re indemnification.
        10(h)    Letter Agreement  dated January  30, 1994,  from  COMSAT Corporation  to the  Board of  Directors  of
                 Radiation Systems, Inc. re certain employee benefits.
        23(a)    Consent of Deloitte & Touche, independent public accountants to COMSAT Corporation.
        23(b)    Consent of Deloitte & Touche, independent public accountants to Radiation Systems, Inc.
        23(c)    Consent of Crowell & Moring (included in Exhibit 5).
        23(d)    Consent  of  Shaw, Pittman,  Potts &  Trowbridge, a  partnership including  professional corporations
                 (included in Exhibit 8).
        23(e)    Consent of Alex. Brown & Sons Incorporated.
        24       Powers of Attorney (see "Signatures").
        99(a)    Form of Radiation Systems, Inc. Proxy Card.
        99(b)    Communications Satellite Act  of 1962,  as amended  (Incorporated by  reference to  Exhibit 28(c)  to
                 Registrant's Registration Statement on Form S-4, Commission File No. 33-9966).
        99(c)    Instructions to participants in the Radiation Systems, Inc. Employee Stock Ownership Plan and form of
                 Directions to Trustees regarding voting of allocated shares.
</TABLE>

    (b)  Financial Statement Schedules  II, V, VI,  VIII and IX  are included in
Registrant's Annual Report on  Form 10-K for the  year ended December 31,  1993,
and are incorporated herein by reference.

    (c)  The opinion of Alex. Brown & Sons Incorporated is included as Exhibit C
to the Proxy Statement/ Prospectus filed as part of this Registration Statement.

ITEM 22. UNDERTAKINGS.

    The undersigned registrant hereby undertakes:

    (1) to file, during any  period in which offers or  sales are being made,  a
post-effective amendment to this registration statement:

        (i)  to  include  any prospectus  required  by section  10(a)(3)  of the
    Securities Act of 1933;

        (ii) to reflect in the prospectus  any facts or event arising after  the
    effective   date  of  the   registration  statement  (or   the  most  recent
    post-effective amendment thereof) which,  individually or in the  aggregate,
    represent  a  fundamental  change  in  the  information  set  forth  in  the
    registration statement; and

       (iii) to include  any material information  with respect to  the plan  of
    distribution  not previously disclosed in  the registration statement or any
    material change to such information in the registration statement;

PROVIDED, HOWEVER, that the undertakings  set forth in paragraphs (a)(1)(i)  and
(a)(1)(ii)  above do not apply  if the information required  to be included in a
post-effective amendment by  those paragraphs is  contained in periodic  reports
filed  by  the registrant  pursuant to  Section  13 or  15(d) of  the Securities
Exchange Act of  1934 that are  incorporated by reference  in this  registration
statement;

                                      II-2
<PAGE>
    (2) that, for the purposes of determining any liability under the Securities
Act  of 1933,  each such post-effective  amendment shall  be deemed to  be a new
registration statement  relating  to the  securities  offered therein,  and  the
offering  of such securities at that time shall be deemed to be the initial BONA
FIDE offering thereof;

    (3) to remove from registration by  means of a post-effective amendment  any
of the securities being registered which remain unsold at the termination of the
offering.

    The   undersigned  registrant  hereby  undertakes   that,  for  purposes  of
determining any liability under the Securities  Act of 1933, each filing of  the
registrant's  annual report  pursuant to section  13(a) or section  15(d) of the
Securities Exchange  Act  of 1934  that  is  incorporated by  reference  in  the
registration  statement  shall  be deemed  to  be a  new  registration statement
relating to the securities offered therein, and the offering of such  securities
at that time shall be deemed to be the initial BONA FIDE offering thereof.

    The  undersigned  registrant hereby  undertakes to  respond to  requests for
information that is incorporated  by reference into  the prospectus pursuant  to
Item  4, 10(b), 11,  or 13 of this  form, within one business  day of receipt of
such request, and  to send  the incorporated documents  by first  class mail  or
other  equally  prompt means.This  includes  information contained  in documents
filed subsequent to the effective date of the registration statement through the
date of responding to the request.

    The undersigned  registrant  hereby  undertakes  to supply  by  means  of  a
post-effective  amendment  all  information concerning  a  transaction,  and the
company being  acquired  involved therein,  that  was  not the  subject  of  and
included in the registration statement when it became effective.

    Insofar  as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers, and controlling persons of  the
registrant  pursuant to the provisions specified in Item 20 of this Registration
Statement, or otherwise, the registrant has been advised that in the opinion  of
the  Securities and Exchange  Commission such indemnification  is against public
policy as expressed in  the Act and is,  therefore, unenforceable. In the  event
that  a  claim  for indemnification  against  such liabilities  (other  than the
payment by the registrant of expenses incurred or paid by a director, officer or
controlling person of the  registrant in the successful  defense of any  action,
suit  or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered, the registrant will,  unless
in  the  opinion of  its  counsel the  matter  has been  settled  by controlling
precedent, submit to a  court of appropriate  jurisdiction the question  whether
such  indemnification by it is against public policy as expressed in the Act and
will be governed by the final adjudication of such issue.

                                      II-3
<PAGE>
                                   SIGNATURES

    Pursuant  to the requirements of the Securities Act, the registrant has duly
caused  this  registration  statement  to  be  signed  on  its  behalf  by   the
undersigned,  thereunto duly authorized,  in the County  of Montgomery, State of
Maryland, on May 2, 1994.

                                          COMSAT CORPORATION
                                          (REGISTRANT)

                                          By    /s/ BRUCE L. CROCKETT
                                          --------------------------------------
                                         BRUCE L. CROCKETT, PRESIDENT
                                         AND CHIEF EXECUTIVE OFFICER

    Each of  the  undersigned  hereby  appoints Bruce  L.  Crockett,  C.  Thomas
Faulders,  III, Warren Y. Zeger, Jerome W. Breslow and Robert N. Davis, Jr., and
each of them severally, his or her true and lawful attorneys to execute (in  the
name  and on behalf of  and as attorneys for  the undersigned) this registration
statement and any and all amendments to this registration statement, and to file
the same, with all exhibits thereto and other documents in connection therewith,
with the Securities and Exchange Commission.

    Pursuant  to  the  requirements  of   the  Securities  Act  of  1933,   this
registration  statement  has  been  signed  by  the  following  persons  in  the
capacities indicated on the date indicated.

<TABLE>
<S>                               <C>
                                  (1) PRINCIPAL EXECUTIVE OFFICER
May 2, 1994                       /S/ BRUCE L. CROCKETT
                                   ---------------------------------------------------------
                                   (BRUCE L. CROCKETT, PRESIDENT AND
                                   CHIEF EXECUTIVE OFFICER)
                                  (2) PRINCIPAL FINANCIAL OFFICER
May 2, 1994                       /S/ C. THOMAS FAULDERS, III
                                   ---------------------------------------------------------
                                   (C. THOMAS FAULDERS, III, VICE PRESIDENT
                                   AND CHIEF FINANCIAL OFFICER)
                                  (3) PRINCIPAL ACCOUNTING OFFICER
May 2, 1994                       /S/ ALLEN E. FLOWER
                                   ---------------------------------------------------------
                                   (ALLEN E. FLOWER, CONTROLLER)
                                  (4) BOARD OF DIRECTORS
May 2, 1994                       /S/ LUCY WILSON BENSON
                                   ---------------------------------------------------------
                                   (LUCY WILSON BENSON, DIRECTOR)
May 2, 1994                       /S/ RUDY BOSCHWITZ
                                   ---------------------------------------------------------
                                   (RUDY BOSCHWITZ, DIRECTOR)
May 2, 1994                       /S/ EDWIN I. COLODNY
                                   ---------------------------------------------------------
                                   (EDWIN I. COLODNY, DIRECTOR)
</TABLE>

                                      II-4
<PAGE>

<TABLE>
<S>                               <C>
May 2, 1994                       /S/ BRUCE L. CROCKETT
                                   ---------------------------------------------------------
                                   (BRUCE L. CROCKETT, DIRECTOR)
May 2, 1994                       /S/ FREDERICK B. DENT
                                   ---------------------------------------------------------
                                   (FREDERICK B. DENT, DIRECTOR)
                                   ---------------------------------------------------------
                                   (JAMES B. EDWARDS, DIRECTOR)
May 2, 1994                       /S/ NEAL B. FREEMAN
                                   ---------------------------------------------------------
                                   (NEAL B. FREEMAN, DIRECTOR)
May 2, 1994                       /S/ BARRY M. GOLDWATER
                                   ---------------------------------------------------------
                                   (BARRY M. GOLDWATER, DIRECTOR)
May 2, 1994                       /S/ ARTHUR HAUSPURG
                                   ---------------------------------------------------------
                                   (ARTHUR HAUSPURG, DIRECTOR)
May 2, 1994                       /S/ MELVIN R. LAIRD
                                   ---------------------------------------------------------
                                   (MELVIN R. LAIRD, CHAIRMAN OF THE
                                   BOARD OF DIRECTORS)
May 2, 1994                       /S/ PETER W. LIKINS
                                   ---------------------------------------------------------
                                   (PETER W. LIKINS, DIRECTOR)
May 2, 1994                       /S/ HOWARD M. LOVE
                                   ---------------------------------------------------------
                                   (HOWARD M. LOVE, DIRECTOR)
May 2, 1994                       /S/ ROBERT G. SCHWARTZ
                                   ---------------------------------------------------------
                                   (ROBERT G. SCHWARTZ, DIRECTOR)
May 2, 1994                       /S/ C.J. SILAS
                                   ---------------------------------------------------------
                                   (C. J. SILAS, DIRECTOR)
May 2, 1994                       /S/ DOLORES D. WHARTON
                                   ---------------------------------------------------------
                                   (DOLORES D. WHARTON, DIRECTOR)
</TABLE>

                                      II-5

<PAGE>

                                                        EXHIBIT 5
                                CROWELL & MORING
                         1001 Pennsylvania Avenue, N.W.
                          Washington, D.C.  20004-2595
                                 (202) 624-2500
                            Facsimile (202) 628-5116




                                   May 2, 1994



COMSAT Corporation
6560 Rock Spring Drive
Bethesda, Maryland  20817

                     Re:  REGISTRATION STATEMENT ON FORM S-4

Ladies and Gentlemen:

     We have acted as counsel to COMSAT Corporation, a District of Columbia
corporation (the "Company"), in connection with the merger (the "Merger") of
Radiation Systems, Inc., a Nevada corporation ("RSi"), with and into CTS
America, Inc., a Delaware corporation that is a wholly owned subsidiary of the
Company ("CTS America"), pursuant to an Agreement and Plan of Merger, dated as
of January 30, 1994, by the among the Company, CTS America and RSi (the "Merger
Agreement"), and the Company's Registration Statement on Form S-4 under the
Securities Act of 1933, as amended (the "Act"), relating to the issuance of up
to 6,409,210 shares of the Company's Common Stock, without par value (the
"COMSAT Shares"), pursuant to the Merger Agreement on the Effective Date (such
Registration Statement, including all exhibits thereto, in the form declared
effective by the Commission, the "Registration Statement").  Capitalized terms
not otherwise defined herein are defined as set forth in the Merger Agreement.

     In connection with this opinion, we have examined the following records,
documents, instruments and certificates:

          (i)       the Articles of Incorporation of the Company, as currently
in effect;

          (ii)      the Merger Agreement; and

          (iii)     such other documents as we have deemed necessary or
appropriate as a basis for the opinion set forth below.

<PAGE>

COMSAT Corporation
May 2, 1994
Page 2

     Based upon and subject to the foregoing, and further subject to the
assumptions and qualifications set forth below, it is our opinion that when (i)
the Registration Statement has become effective under the Act and (ii) the
COMSAT Shares have been issued in accordance with the terms of the Merger
Agreement, as it may be amended from time to time, the COMSAT Shares will be
validly issued, fully paid and non-assessable.

     In our examination, we have assumed the genuineness of all signatures, the
legal capacity of natural persons, the authenticity of all documents submitted
to us as originals, the conformity to original documents of all documents
submitted to us as certified or photostatic copies and the authenticity of the
originals of such copies.  As to any facts material to this opinion which we did
not independently establish or verify, we have relied upon statements and
representations of officers and other representations of the Company and others.

     We are members of the Bar of the District of Columbia and we express no
opinion with respect to the laws of any other jurisdiction other than the
District of Columbia, the United States of America and the corporate laws of the
State of Delaware.

     We are furnishing this opinion to you solely in connection with the
Registration Statement.  This opinion is solely for your benefit and is not to
be used, circulated, quoted or otherwise referred to for any other purpose or
relied upon by any other person without our express written permission.  This
opinion is based and relies on the current status of the law, and is subject in
all respects to, and may be limited by, further rules, regulations and
legislation, as well as developing case law.  We do not undertake to notify any
person of changes in facts or law occurring or coming to our attention after the
delivery of this opinion.

     We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the reference to our firm under the caption "Legal
Matters" in the Proxy Statement/Prospectus that forms part of the Registration
Statement.

                              Very truly yours,

                              /s/ Crowell & Moring

                              CROWELL & MORING

<PAGE>

                                                                       Exhibit 8

                     SHAW, PITTMAN, POTTS & TROWBRIDGE
             A PARTNERSHIP INCLUDING PROFESSIONAL CORPORATIONS
                            2300 N Street, N.W.
                       Washington, D.C.  20037-1128
                              (202) 663-8000
                                 Facsimile
                              (202) 663-8007



                                May 2, 1994




Radiation Systems, Inc.
1501 Moran Road
Sterling, Virginia   20166

COMSAT Corporation
6560 Rock Spring Drive
Bethesda, Maryland   20817

Ladies and Gentlemen:

    You have requested our opinion with respect to certain of the
federal income tax consequences of the proposed merger (the
"Merger") of Radiation Systems, Inc. ("RSI") with and into CTS
America, Inc. ("CTS America") pursuant to the Agreement and Plan of
Merger dated as of January 30, 1994, among COMSAT Corporation
("COMSAT"), CTS America and RSI (the "Merger Agreement").  Capi-
talized terms used but not defined herein shall have the same
meaning as in the Merger Agreement.

    Pursuant to the Merger Agreement, on the Effective Date RSI
will merge with and into CTS America, and CTS America will be the
surviving corporation.  As of the Effective Date, each share of RSI
Common Stock outstanding immediately prior to the Effective Date
will be converted into that fraction (the "Conversion Fraction") of
a share of COMSAT Common Stock determined by dividing $18.25 by the
average closing price of COMSAT Common Stock on the New York Stock
Exchange ("NYSE") during the 20 trading days ending five trading
days prior to the Closing Date of the Merger.  The Conversion
Fraction, however, will not be less than .638 and will not be
greater than .780.  No certificates representing fractional shares
of COMSAT Common Stock will be issued.  Rather, cash in an amount
equal to the product of the fractional share interest and the
closing price of a whole share of COMSAT Common  Stock on the NYSE
on the last full trading day prior to the Effective Date will be
distributed to RSI stockholders in lieu of fractional shares.

    We have examined originals, or copies certified or otherwise
identified to our satisfaction, of the Merger Agreement and the

<PAGE>

Radiation Systems, Inc.
COMSAT Corporation
Page 2
May 2, 1994

form of the Proxy Statement/Prospectus dated May __, 1994 to be
provided to stockholders of RSI (the "Proxy Statement/Prospectus").
In our examination, we have assumed the genuineness of all
signatures, the legal capacity of natural persons, the authenticity
of all documents submitted to us as originals, the conformity to
original documents of all documents submitted to us as certified,
facsimile or photostatic copies and the authenticity of the
originals of such documents.  As to any facts material to such
opinion that are not expressly assumed herein, we have relied upon
statements and representations of officers of COMSAT, CTS America
and RSI and on factual information in the Proxy
Statement/Prospectus.

    Based upon and subject to the foregoing, and the assumptions
set forth below, and on the basis of laws, regulations, rulings and
decisions in effect as of the date hereof, all of which are subject
to change, retroactively or prospectively, or possibly differing
interpretations, it is our opinion that the Merger will constitute
a reorganization within the meaning of Sections 368(a)(1)(A) and
368(a)(2)(D) of the Internal Revenue Code of 1986, as amended (the
"Code").  Accordingly:

    1.   No gain or loss will be recognized by RSI, COMSAT or CTS
America as a result of the Merger;

    2.   No gain or loss will be recognized by any RSI stockholder
on the exchange by such stockholder of its RSI Common Stock for
COMSAT Common Stock;

    3.   Each RSI stockholder will take a basis for federal income
tax purposes in the COMSAT Common Stock it receives as a result of
the Merger equal to such stockholder's basis in its RSI Common
Stock surrendered therefor (reduced by any amount allocable to a
fractional share interest for which cash is received);

    4.   Each RSI stockholder will have a holding period for
federal income tax purposes with respect to the COMSAT Common Stock
it receives as a result of the Merger that includes such
stockholder's holding period with respect to the RSI Common Stock
surrendered therefor, provided that such stockholder held its
shares of RSI Common Stock as capital assets immediately prior to
the Effective Date; and

    5.   Each RSI stockholder receiving cash in lieu of a frac-
tional share interest generally should be treated as if such

<PAGE>

Radiation Systems, Inc.
COMSAT Corporation
Page 3
May 2, 1994

stockholder actually received such fractional share interest and
such interest was subsequently redeemed by COMSAT.  This redemption
generally should result in either (i) capital gain or loss measured
by the difference between the amount of cash received and the
portion of the stockholder's basis in its RSI Common Stock
allocable to the fractional share of COMSAT Common Stock deemed
redeemed, or (ii) a dividend in an amount equal to the amount of
cash received, depending, among other things, on the stockholder's
percentage ownership of COMSAT, including ownership by attribution.

    The foregoing opinion is based on the following assumptions:

    1.   The fair market value of the COMSAT Common Stock received
by each RSI stockholder will be approximately equal to the fair
market value of the RSI Common Stock exchanged therefor;

    2.   CTS America will acquire at least 90 percent of the fair
market value of the net assets and at least 70 percent of the fair
market value of the gross assets held by RSI immediately prior to
the Merger (treating RSI assets used to pay its reorganization
expenses or to redeem RSI Common Stock during the past 36 months as
assets held by RSI immediately prior to the Merger);

    3.   COMSAT has no plan or intention to sell and CTS America
has no plan or intention to issue CTS America stock if the effect
of such sale or issuance would be to reduce COMSAT's ownership of
CTS America stock to an amount that is less than the amount
required for COMSAT to be deemed to be in control of CTS America
for purposes of Section 368(a)(2)(D) of the Code;

    4.   COMSAT has no plan or intention to reacquire any of the
shares of COMSAT Common Stock issued as a result of the Merger;

    5.   COMSAT has no plan or intention to liquidate CTS America,
to merge CTS America with and into another corporation, to sell or
otherwise dispose of the stock of CTS America, or to cause CTS
America to sell or otherwise dispose of any of the assets acquired
in the Merger, except for sales or dispositions in the ordinary
course of business or transfers described in Section 368(a)(2)(C)
of the Code;

    6.   COMSAT, CTS America, RSI and the RSI stockholders will
pay their respective expenses, if any, incurred in connection with
the Merger, except that RSI and CTS America may pay or

<PAGE>

Radiation Systems, Inc.
COMSAT Corporation
Page 4
May 2, 1994

assume those expenses of RSI that are solely and directly related
to the Merger;

    7.   After the Merger, CTS America will continue RSI's his-
toric business or use a significant portion of RSI's assets in a
business;

    8.   The liabilities of RSI assumed by CTS America and the
liabilities to which the transferred assets of CTS America are
subject were incurred by RSI in the ordinary course of its busi-
ness;

    9.   There is no intercorporate indebtedness existing between
COMSAT and RSI or between CTS America and RSI that was issued,
acquired or will be settled at a discount;

    10.  The fair market value of the assets of RSI transferred to
CTS America will equal or exceed the sum of the liabilities assumed
by CTS America, plus the amount of liabilities, if any, to which
the transferred assets are subject;

    11.  As of the Effective Date, the value of the COMSAT Common
Stock received by RSI stockholders as a result of the Merger was
greater than 50% of the value of all of the RSI Common Stock
outstanding immediately prior to the Effective Date (treating
fractional share interests for which cash is received, and stock
redeemed within the past 36 months, as outstanding RSI Common
Stock); and

    12.  The stockholders of RSI who own five percent or more of
the RSI Common Stock (and, to the best of the knowledge of the
management of RSI, the remaining stockholders of RSI) have no plan
or intention to sell, exchange or otherwise dispose of a number of
shares of COMSAT Common Stock received in the Merger that would
reduce the RSI stockholders' ownership of COMSAT Common Stock to a
number of shares having a value as of the Effective Date of less
than 50 percent of the value of all the formerly outstanding RSI
Common Stock immediately prior to the Effective Date (treating
fractional share interests for which cash is received, and stock
redeemed within the past 36 months, as outstanding RSI Common
Stock).

    This opinion is limited to the matters expressly stated
herein, and no opinion may be inferred or implied beyond such
matters.  This opinion is furnished to you solely for your

<PAGE>

Radiation Systems, Inc.
COMSAT Corporation
Page 5
May 2, 1994

benefit and for the benefit of the RSI stockholders voting on this
transaction and may not be relied upon by any other party.

    We hereby consent to the filing of this opinion as an exhibit
to the Registration Statement on Form S-4 (Filing No. _____) of
which the Proxy Statement/Prospectus is a part.  We also consent to
the references to Shaw, Pittman, Potts & Trowbridge under the
headings "Certain Federal Income Tax Consequences" and "Legal
Matters" in the Proxy Statement/Prospectus.

                           Very truly yours,

                           /s/ Shaw, Pittman, Potts & Trowbridge

                           Shaw, Pittman, Potts & Trowbridge

<PAGE>

                                                                 Exhibit 10(a)
                                      EMPLOYMENT AGREEMENT
                                      --------------------

      This AGREEMENT made as of the 30th day of January, 1994, by and among
COMSAT Corporation, a District of Columbia corporation ("COMSAT"), CTS America,
Inc., a Delaware corporation and a wholly owned subsidiary of COMSAT ("CTS"),
and Richard E. Thomas, a resident of the Commonwealth of Virginia (the
"Executive").

      WHEREAS, COMSAT and CTS have entered into an Agreement and Plan of Merger
(the "Merger Agreement"), dated as of January 30, 1994, among COMSAT, CTS, and
Radiation Systems, Inc., a Nevada corporation ("RSI"), pursuant to which RSI
will be merged with and into CTS (the "Merger"); and

      WHEREAS, the Executive currently serves as the Chairman of the Board and
Chief Executive Officer of RSI; and

      WHEREAS, the Executive is currently subject to an Employment Agreement, as
amended November 20, 1993, with RSI (the "RSI Employment Agreement"); and

      WHEREAS, it is a condition to COMSAT's and CTS's obligations under the
Merger Agreement to consummate the Merger that Executive enter into an
employment agreement with COMSAT on or prior to the date of the Merger; and

      WHEREAS, COMSAT and CTS desire that the RSI Employment Agreement be
terminated at the time of consummation of the Merger; and

      WHEREAS, COMSAT desires to employ the Executive, and the Executive desires
to become an employee of COMSAT, on the terms and conditions set forth herein;

      NOW, THEREFORE, in consideration of the premises and the mutual agreements
made herein, and intending to be legally bound hereby, COMSAT and the Executive
agree as follows:

            1.    EMPLOYMENT; TERMINATION OF RSI EMPLOYMENT AGREEMENT; DUTIES.
                  (a)   EMPLOYMENT AND EMPLOYMENT PERIOD.  COMSAT shall employ
the Executive to serve as President of the COMSAT RSI Division or subsidiary or
other successor operating entity within COMSAT (the "Division") for a
continuous period of three (3) years (the "Employment Period") commencing on
the "Effective Date" (as such term is defined in Section 1.2 of the Merger
Agreement).

                  (b)   TERMINATION OF RSI EMPLOYMENT AGREEMENT.  Effective on
the Effective Date, the RSI Employment Agreement shall be terminated and be of
no further force and effect.

<PAGE>

                  (c)   OFFICES, DUTIES AND RESPONSIBILITIES.  Effective on the
Effective Date, Executive shall be elected President of the Division of the
COMSAT Subsidiary through which the Division shall operate.  The Executive shall
report to the President of COMSAT and shall be a member of the senior management
group of COMSAT.  The Executive's offices initially shall be located at RSI's
present headquarters building in Sterling, Virginia, and shall during the
Employment Period remain in the Washington, D.C. metropolitan area.  The
Executive shall have the lead responsibility, working with COMSAT's senior
management group, to direct and develop the capabilities and performance of the
Division.

                  (d)   DEVOTION TO INTERESTS OF COMSAT.  During the Employment
Period the Executive shall render his business services solely in the
performance of his duties hereunder.  The Executive shall use his best efforts
to promote the interests and welfare of COMSAT.  Notwithstanding the foregoing,
the Executive shall be entitled to undertake such outside activities as are
approved in advance by COMSAT's Board of Directors (the "Board"), such approval
not to be unreasonably withheld.

            2.    COMPENSATION AND FRINGE BENEFITS.

                  (a)   BASE COMPENSATION.  COMSAT shall pay the Executive a
base salary ("Base Salary") at the rate of $315,000 per year through the end of
the Employment Period with payments made in installments in accordance with
COMSAT's regular practice for compensating executive personnel.  The Base Salary
for the Executive shall be reviewed for merit-based increases to be effective
each January during the Employment Period consistent with merit-based reviews
for COMSAT's senior management group.

                  (b)   BONUS COMPENSATION.  The Executive will be eligible to
receive bonuses under COMSAT's Annual Incentive Plan (the "AIP").  For the year
ending December 31, 1994, the Executive shall be paid a guaranteed bonus of at
least $100,000 in January 1995.  Thereafter, the Executive shall receive bonuses
as determined by the Board based upon his satisfying performance goals agreed to
in writing by the Executive and the President of COMSAT.  In addition, the
Committee on Compensation and Management Development (the "Compensation
Committee") of the Board may in its discretion award to Executive AIP
"Restricted Stock Units" under the COMSAT 1990 Key Employee Stock Plan (the
"Option Plan").

                  (c)   DEFERRED COMPENSATION.  At Executive's option, he
may defer up to 25% of his Base Salary and up to 100% of his bonus under the
COMSAT Directors and Executives Deferred Compensation Plan.

                  (d)   RETENTION BONUSES.  The Executive shall be entitled to
receive retention bonuses so long as he remains employed by COMSAT on the date
such bonuses are payable as follows:  (i) 90 days after the Effective Date, a
retention bonus of $50,000; (ii) on the first anniversary of the Effective Date,
a retention bonus

                                     2

<PAGE>

of $50,000; (iii) on the second anniversary of the Effective Date, a retention
bonus of $50,000; and (iv) on the third anniversary of the Effective Date, a
retention bonus of $100,000.

                  (e)   FRINGE BENEFITS.  The Executive also shall be entitled
to such fringe benefits as are generally made available by COMSAT to the senior
management group.  Such benefits shall include participation in the COMSAT Split
Dollar Insurance Plan (which for Executive shall provide a death benefit of
$945,000, to be increased by 5.5% annually each January during the Employment
Period), the Option Plan, the COMSAT Employee Stock Purchase Plan, the COMSAT
Dividend Reinvestment Plan, the Division's health and disability insurance
programs, and reimbursement of reasonable expenses incurred in connection with
travel and entertainment related to COMSAT's business and affairs.  The
Executive shall also be provided with a car for business and personal use
consistent with his auto benefit previously provided by RSI.  In the event of
the termination of this agreement for any reason, COMSAT at its expense shall
make arrangements to transfer title of the car the Executive is then using to
the Executive.

                  (f)   SERP.  Executive shall be entitled to immediate
participation in the COMSAT Insurance and Retirement Plan for Executives, and
shall be deemed fully vested in such Plan on the Effective Date.

                  (g)   FINANCIAL PLANNING.  The Executive shall be entitled to
receive financial counseling and planning services provided by COMSAT consistent
with similar services provided to the COMSAT senior management group.

            3.    STOCK OPTIONS.  On the Effective Date COMSAT shall grant to
the Executive non-statutory stock options (the "Options") under the Option Plan
to purchase 80,000 shares of COMSAT's common stock, without par value ("Common
Stock"), at a purchase price equal to the average of the high and low trading
price of the Common Stock on the New York Stock Exchange on the date of the
execution and delivery of the Merger Agreement, or if such date is not a date
on which the Common Stock has traded, the first trading date immediately prior
to execution and delivery of the Merger Agreement.  Such Options shall be
represented by a stock option agreement ("Option Agreement") in the form and
containing the terms customarily used by COMSAT for such agreements including
terms relating to the length of the Option term, vesting conditions and
termination of employment.

            4.    RSAs.  On the Effective Date, COMSAT shall grant the Executive
18,500 Restrictive Stock Awards (RSAs) under the Option Plan, which RSAs shall
entitle Executive to receive dividends (when and in the same amounts as
dividends are paid on Common Stock) as provided under the Option Plan.  The
vesting of such RSAs shall be subject to the satisfaction of objective
performance standards to be adopted by the Board and approved by COMSAT's
shareholders.

                                     3

<PAGE>


            5.    TRADE SECRETS.  The Executive shall not (for his own benefit
or the benefit of any person or entity other than COMSAT) use or disclose any of
COMSAT's trade secrets or other confidential information.  The term "trade
secrets or other confidential information" includes, by way of example, matters
of a technical nature, such as scientific, trade and engineering secrets, "know-
how", formulae, secret processes or machines, inventions, computer programs
(including documentation of such programs) and research projects, and matters of
a business nature, such as proprietary information about costs, profits,
markets, sales, lists of customers, and other information of a similar nature to
the extent not available to the public, and plans for future development, but
shall not include the Executive's knowledge of generic concepts pertaining to
manufacturing techniques.  After termination of this Agreement, the Executive
shall not use or disclose trade secrets or other confidential information unless
such information becomes a part of the public domain other than through a breach
of this Agreement or is disclosed to the Executive by a third party who is
entitled to receive and disclose such information.

            6.    RETURN OF DOCUMENTS AND PROPERTY.  Upon the effective date of
notice of the Executive's or  COMSAT's  election to terminate this Agreement, or
at any time upon the request of COMSAT, the Executive (or his heirs or personal
representatives) shall deliver to COMSAT (a) all documents and materials
containing trade secrets or other confidential information relating to COMSAT's
business and affairs, and (b) all documents, materials and other property
belonging to COMSAT, which in either case are in the possession or under the
control of the Executive (or his heirs or personal representatives).

            7.    DISCOVERIES AND WORKS.  All discoveries and works made or
conceived by the Executive during his employment by COMSAT, jointly or with
others, that relate to COMSAT's activities shall be owned by COMSAT.  The term
"discoveries and works" includes, by way of example, inventions, computer
programs (including documentation of such programs), technical improvements,
processes, drawings and works of authorship.  The Executive shall (a) promptly
notify, make full disclosure to, and execute and deliver any documents requested
by, COMSAT to evidence or better assure title to such discoveries and works in
COMSAT, (b) assist COMSAT in obtaining or maintaining for itself at its own
expense United States and foreign patents, copyrights, trade secret protection
or other protection of any and all such discoveries and works, and (c) promptly
execute, whether during his employment by or thereafter, all applications or
other endorsements necessary or appropriate to maintain patents and other rights
for COMSAT and to protect its title thereto.  Any discoveries and works which,
within six months after the termination of the Executive's employment by COMSAT,
are made, disclosed, reduced to a tangible or written form or description, or
are reduced to practice by the Executive and which pertain to work performed by
the Executive while with COMSAT and RSI shall, as between the Executive and
COMSAT, be presumed to have been made during the Executive's employment by
COMSAT.

                                     4

<PAGE>

            8.    TERMINATION.  This Agreement shall remain in effect during the
Employment Term, and this Agreement and Executive's employment with COMSAT may
be terminated only as follows:

                  (a)   By Executive at any time upon 60 day advance written
notice to COMSAT should COMSAT, without Executive's express written consent,
substantially reduce (except in connection with the termination of his
employment voluntarily by Executive or by COMSAT for "cause" as defined below)
his responsibilities as President of the Division and as a member of COMSAT's
senior management group.  At the end of the 60 day advance notice period,
COMSAT shall pay Executive in a lump sum (subject to withholding obligations as
may be imposed by law) (i) his then current Base Salary through the remainder of
the Employment Period hereunder, plus (ii) an amount equal to his last bonus
under the AIP payable under paragraph (b) of Section 2 of this Agreement
multiplied by the number of January months remaining in the Employment
Period, inclusive.  In such event, all fringe benefits provided under this
Agreement which have not vested shall cease upon the effective date of
termination, and COMSAT shall provide Executive such health benefits as may
be required under applicable COBRA law and regulation.

                  (b)   For purposes of this Agreement, COMSAT shall have
"cause" to terminate the Executive's employment hereunder upon (i) the
continued and deliberate failure of the Executive to perform his duties,
in a manner substantially consistent with the manner prescribed by the Board
or the President of COMSAT (other than any such failure resulting from his
incapacity due to physical or mental illness), which failure continues for ten
days following the Executive's receipt of written notice from the Board or the
President of COMSAT specifying the manner in which the Executive is in default
of his duties, (ii) the engaging by the Executive in serious misconduct that is
materially and demonstrably injurious to COMSAT or its reputation, (iii) the
conviction of the Executive of commission of a felony involving a crime of moral
turpitude, whether or not such felony was committed in connection with COMSAT's
business, or (iv) the circumstances described in Section 9 hereof, in which case
the provisions of Section 9 shall govern the rights and obligations of the
parties.

            9.    DISABILITY; DEATH.

                   (a)  If, prior to the expiration or termination of the
Employment Period, the Executive shall be unable to perform his duties by reason
of disability or impairment of health for at least six consecutive calendar
months, COMSAT shall have the right to terminate this Agreement by giving 60
days written notice to the Executive to that effect, but only if at the time
such notice is given such disability or impairment is still continuing.
Following the expiration of the notice period, the Employment Period shall
terminate with the payment of the Executive's Base Salary for the month in which
notice is given.  In the event of a dispute as to whether the Executive is
disabled within the meaning of this paragraph (a) of Section 9, or the duration
of any disability, either party may request a medical examination of the

                                     5

<PAGE>

Executive by a doctor appointed by the Chief of Staff of a hospital selected by
mutual agreement of the parties, or as the parties may otherwise agree, and the
written medical opinion of such doctor shall be conclusive and binding upon the
parties as to whether the Executive has become disabled and the date when such
disability arose.  The cost of any such medical examinations shall be borne by
COMSAT.

                  (b)   If, prior to the expiration or termination of the
Employment Period, the Executive shall die, COMSAT shall pay to the Executive's
estate his Base Salary through the end of the month in which the Executive's
death occurred, at which time the Employment Period shall terminate without
further notice.

                  (c)   Nothing contained in this Section 9 shall impair or
otherwise affect any rights and interests of the Executive under any
compensation plan or arrangement of COMSAT which may be adopted by the Board.

            10.   NON-COMPETITION.

                  (a)   Except as provided in paragraph (d) below, the Executive
agrees that for a period commencing as of the Effective Date and running through
the earlier of (i) the end of the Employment Period if the Executive remains
employed by COMSAT for the entire Employment Period or (ii) two years following
termination of the Executive's employment by COMSAT for any reason, whether by
action of the Executive or COMSAT (the "Non-Competition Period"), the Executive
will not, except as otherwise provided herein, engage or participate, directly
or indirectly, as principal, agent, employee, employer, consultant, stockholder,
partner or in any other individual capacity whatsoever, in the conduct or
management of, or own any stock or any other equity investment in or debt of,
any business which is competitive with any business conducted by the Division.

                  For the purpose of this Agreement, a business shall be
considered to be competitive with the business of the Division only if such
business is engaged in providing services or products (i) similar to (x) any
service or product currently provided by the Division or provided by the
Division during the Employment Period; (y) any service or product which evolves
from or results from enhancements in the ordinary course during the
Non-Competition Period to the services or products provided by the Division
as of the date hereof or during the Employment Period; or (z) any future
service or product of the Division as to which the Executive materially and
substantially participated in the design or enhancement, and (ii) to customers
and clients of the type served by the Division during the Non-Competition
Period.

                  (b)   NON-SOLICITATION OF EMPLOYEES.  During the
Non-Competition Period, the Executive will not (for his own benefit or
for the benefit of any person or entity other than COMSAT) solicit, or
assist any person or entity other than COMSAT to solicit, any officer,
director, executive or employee of COMSAT to leave his or her employment.

                                     6

<PAGE>

                  (c)   REASONABLENESS.  The Executive acknowledges that (i) the
markets served by COMSAT are national and international and are not dependent on
the geographic location of executive personnel or the businesses by which they
are employed, (ii) the length of the Non-Competition Period is linked to the
term of the Employment Period and the severance benefit provided for in Section
8(a); and (iii) the above covenants are manifestly reasonable on their face, and
the parties expressly agree that such restrictions have been designed to be
reasonable and no greater than is required for the protection of COMSAT.

                  (d)   INVESTMENT.  Nothing in this Agreement shall be deemed
to prohibit the Executive from owning equity or debt investments in any
corporation, partnership or other entity which is competitive with COMSAT,
PROVIDED that such investments (i) are passive investments and constitute five
percent (5%) or less of the outstanding equity securities of such an entity the
equity securities of which are traded on a national securities exchange or other
public market, or (ii) are approved by the Board.

            11.   ENFORCEMENT.  The Executive agrees that COMSAT's remedies at
law for any breach or threat of breach by him of the provisions of Sections
5, 6, 7 and 10 hereof will be inadequate, and that COMSAT shall be entitled to
an injunction or injunctions to prevent breaches of the provisions of
Sections 5, 6, 7 and 10 hereof and to enforce specifically the terms and
provisions thereof, in addition to any other remedy to which COMSAT may be
entitled at law or equity.

            12.   ARBITRATION.

                  (a)   Subject to COMSAT's right to enforce Sections
5,6,7 and 10 hereof by an injunction issued by a court having jurisdiction
(which right shall prevail over and supersede the provisions of this
Section 12), any dispute relating to this Agreement, including the
enforceability of this Section 12, arising between the Executive and COMSAT
or any of its affiliates shall be settled by arbitration before a single
arbitrator in accordance with the commercial arbitration rules of the American
Arbitration Association.

                  (b)   The award of any such arbitrator shall be final.
Judgment upon such award may be entered by the prevailing party in any
federal or state court sitting in Washington, D.C.

                  (c)   The costs of arbitration proceedings, excluding
attorneys' fees, shall be paid by the party that does not prevail in the
arbitration proceedings.

            13.   SEVERABILITY.  Should any provision of this Agreement be
determined to be unenforceable or prohibited by any applicable law, such
provision shall be ineffective to the extent, and only to the extent, of such
unenforceability or prohibition without invalidating the balance of such
provision or any other provision

                                     7
<PAGE>

of this Agreement, and any such unenforceability or prohibition in any
jurisdiction shall not invalidate or render unenforceable such provision in any
other jurisdiction.

            14.   ASSIGNMENT.  The Executive's rights and obligations under this
Agreement shall not be assignable by the Executive.  COMSAT's rights and
obligations under this Agreement shall not be assignable by COMSAT except as
incident to the transfer, by merger or otherwise, of all or substantially all of
the business of the Division.  In the event of any such assignment by COMSAT,
all rights of COMSAT hereunder shall inure to the benefit of the assignee.

            15.   NOTICES.  Any notice required or permitted under this
Agreement shall be deemed to have been effectively made or given if in writing
and personally delivered or mailed properly addressed in a sealed envelope,
postage prepaid by certified or registered mail.  Unless otherwise changed by
notice, notice shall be properly addressed to Executive if addressed to:

                              Richard E. Thomas
                              9207 Light Horse Court
                              Annandale, VA   22030

and properly addressed to COMSAT if addressed to:

                              COMSAT Corporation
                              6560 Rock Spring Drive
                              Bethesda, Maryland 20817

                  Attn:       Vice President, Human Resources and
                              Organization Development

            16.   MISCELLANEOUS.  This Agreement constitutes the entire
agreement, and supersedes all prior agreements, of the parties hereto relating
to the subject matter hereof, and there are no written or oral terms or
representations made by either party other than those contained herein.  The
validity, interpretation, performance and enforcement of the Agreement shall
be governed by the laws of the State of Maryland.  The headings contained herein
are for reference purposes only and shall not in any way affect the meaning or
interpretation of this Agreement.

                                     8

<PAGE>

      IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the day and year first above written.



                                    /s/ RICHARD E. THOMAS
                                       ---------------------------------------
                                         Richard E. Thomas, Executive

                                    COMSAT CORPORATION


                                    By /s/ BRUCE L. CROCKETT
                                           -----------------------------------
                                           Bruce L. Crockett
                                           President and Chief Executive Officer

                                    CTS AMERICA, INC.


                                    By /s/ C. THOMAS FAULDERS
                                           -----------------------------------
                                           C. Thomas Faulders
                                           Vice President and Chief Financial
                                             Officer


                                     9

<PAGE>
                                                                EXHIBIT 10(b)

                              EMPLOYMENT AGREEMENT
                              --------------------

     This AGREEMENT made as of the 30th day of January, 1994, by and among
COMSAT Corporation, a District of Columbia corporation ("COMSAT"), CTS America,
Inc., a Delaware corporation and a wholly owned subsidiary of COMSAT ("CTS"),
and R. Doss McComas, a resident of the Commonwealth of Virginia (the
"Executive").

     WHEREAS, COMSAT and CTS have entered into an Agreement and Plan of Merger
(the "Merger Agreement"), dated as of January 30, 1994, among COMSAT, CTS, and
Radiation Systems, Inc., a Nevada corporation ("RSI"), pursuant to which RSI
will be merged with and into CTS (the "Merger"); and

     WHEREAS, the Executive currently serves as an officer of RSI;

     WHEREAS, the Executive is currently subject to an Employment Agreement, as
amended November 20, 1993, with RSI (the "RSI Employment Agreement"); and

     WHEREAS, COMSAT and CTS desire that the RSI Employment Agreement be
terminated at the time of consummation of the Merger; and

     WHEREAS, COMSAT desires to employ the Executive, and the Executive desires
to become an employee of COMSAT, on the terms and conditions set forth herein;

     NOW, THEREFORE, in consideration of the premises and the mutual agreements
made herein, and intending to be legally bound hereby, COMSAT and the Executive
agree as follows:

     1.   Employment; Termination of RSI Employment Agreement; Duties.
          -----------------------------------------------------------

          (a)   Employment and Employment Period.  COMSAT shall employ the
Executive to serve as Vice President of the COMSAT RSI Division or subsidiary or
other successor operating entity within COMSAT (the "Division") for a continuous
period of three (3) years (the "Employment Period") commencing on the "Effective
Date" (as such term is defined in Section 1.2 of the Merger Agreement).

          (b)   Termination of RSI Employment Agreement.  Effective on the
Effective Date, the RSI Employment Agreement shall be terminated and be of no
further force and effect.

          (c)   Offices, Duties and Responsibilities.  Effective on the
Effective Date, Executive shall be elected Vice President of the Division.
The Executive shall report to the President of the Division.  The Executive's
offices initially shall be located at RSI's present headquarters building in
Sterling, Virginia, and shall during the Employment Period remain in the

<PAGE>

Washington, D.C. metropolitan area.

          (d)   Devotion to Interests of COMSAT.  Except as expressly authorized
by the President of the Division, during the Employment Period the Executive
shall render his business services solely in the performance of his duties
hereunder.  The Executive shall use his best efforts to promote the interests
and welfare of COMSAT.

     2.   Compensation and Fringe Benefits.
          --------------------------------

          (a)   Base Compensation.  COMSAT shall pay the Executive a base salary
("Base Salary") at the rate of (i) $(RSI current salary plus $10,000) per year
through the end of the Employment Period, with payments made in installments in
accordance with COMSAT's regular practice for compensating executive personnel.
The Base Salary for the Executive shall be reviewed for merit-based increases at
least once each calendar year during the Employment Period consistent with
merit-based reviews for other COMSAT executives.  Such reviews shall occur
immediately prior to his "anniversary date" for performance reviews at RSI.

          (b)   Bonus Compensation.  For each year or partial year ending on
December 31 during the Employment Period, the Executive shall be eligible to
receive annual bonuses (payable in January) under the COMSAT Annual Incentive
Plan ("AIP") based upon performance.  The standards applied for performance
reviews of the Executive under the AIP shall be consistent with the standards
applied for performance reviews of other COMSAT executives whose salaries are in
the comparable range of the then current Base Salary of the Executive under this
Agreement.  Any performance bonuses so paid to Executive shall be subject to
deferral at Executive's election under the AIP.

          (c)   Fringe Benefits.  The Executive also shall be entitled to fringe
benefits including participation in the Division's group life insurance plan,
the COMSAT 1990 Key Employee Stock Plan (the "Option Plan"), the COMSAT Employee
Stock Purchase Plan, the COMSAT Dividend Reinvestment Plan, and health and
disability insurance programs of the Division and reimbursement of premiums for
insurance coverage and reasonable expenses incurred in connection with travel
and entertainment related to COMSAT's business and affairs.  The Executive also
shall be entitled to use existing balances of unused medical and legal reim-
bursement expense accounts with RSI until depleted.

          (d)   Retention Bonuses.  The Executive shall be entitled to receive
retention bonuses so long as he remains employed by COMSAT on the date such
bonuses are payable as follows:  (i) 90 days after the Effective Date, a
retention bonus of $25,000, (ii) on the first anniversary of the  Effective


                                       -2-

<PAGE>

Date, a retention bonus of $27,000; (iii) on the second anniversary of the
Effective Date, a retention bonus of $29,000; and (iv) on the third anniversary
of the Effective Date, a retention bonus of $31,500.

     3.   Stock Options.  On the Effective Date, COMSAT shall grant to the
Executive nonstatutory stock options (the "Options") under the Option Plan to
purchase 7,000 shares of COMSAT's common stock, without par value ("Common
Stock"), at a purchase price equal to the closing price of the Common Stock on
the New York Stock Exchange on the date of the execution and delivery of the
Merger Agreement, or if such date is not a date on which the Common Stock has
traded, the first trading date immediately prior to execution and delivery of
the Merger Agreement.  Such Options shall be represented by a stock option
agreement ("Option Agreement") in the form and containing the terms customarily
used by COMSAT for such agreements including terms relating to the length of the
Option term, vesting conditions and termination of employment.

     4.   RSAs.  On the Effective Date, upon execution and delivery of this
Agreement, COMSAT shall grant the Executive 5,000 Restricted Stock Awards (RSAs)
under the Option Plan, which RSAs shall entitle Executive to receive dividends
(when and in the same amounts as dividends are paid on Common Stock) as provided
under the Option Plan.  The vesting of such RSAs shall be subject to the
satisfaction of objective performance standards to be adopted by the Board and
approved by COMSAT's shareholders.

     5.   Trade Secrets.  The Executive shall not (for his own benefit or the
benefit of any person or entity other than COMSAT) use or disclose any of
COMSAT's trade secrets or other confidential information.  The term "trade
secrets or other confidential information" includes, by way of example, matters
of a technical nature, such as scientific, trade and engineering secrets, "know-
how", formulae, secret processes or machines, inventions, computer programs
(including documentation of such programs) and research projects, and matters of
a business nature, such as proprietary information about costs, profits,
markets, sales, lists of customers, and other information of a similar nature to
the extent not available to the public, and plans for future development.  After
termination of this Agreement, the Executive shall not use or disclose trade
secrets or other confidential information unless such information becomes a part
of the public domain other than through a breach of this Agreement or is
disclosed to the Executive by a third party who is entitled to receive and
disclose such information.

     6.   Return of Documents and Property.  Upon the effective date of notice
of the Executive's or COMSAT's election to terminate this Agreement, or at any


                                       -3-

<PAGE>

time upon the request of COMSAT, the Executive (or his heirs or personal
representatives) shall deliver to COMSAT (a) all documents and materials
containing trade secrets or other confidential information relating to
COMSAT's business and affairs, and (b) all documents,materials and other
property belonging to COMSAT, which in either case are in the possession or
under the control of the Executive (or his heirs or personal representatives).

     7.   Discoveries and Works.  All discoveries and works made or conceived
by the Executive during his employment by COMSAT, jointly or with others, that
relate to COMSAT's activities shall be owned by COMSAT.  The term "discoveries
and works" include, by way of example, inventions, computer programs (including
documentation of such programs), technical improvements, processes, drawings
and work of authorship.  The Executive shall (a) promptly notify, make full
disclosure to, and execute and deliver any documents requested by, COMSAT to
evidence or better assure title to such discoveries and works in COMSAT,
(b) assist COMSAT in obtaining or maintaining for itself at its own expense
United States and foreign patents, copyrights, trade secret protection or other
protection of any and all such discoveries and works, and (c) promptly execute,
whether during his employment or thereafter, all applications or other
endorsements necessary or appropriate to maintain patents and other rights for
COMSAT and to protect its title thereto.  Any discoveries and works which,
within six months after the termination of the Executive's employment by
COMSAT, are made, disclosed, reduced to a tangible or written form or
description, or are reduced to practice by the Executive and which pertain to
work performed by the Executive while with COMSAT and RSI shall, as between
the Executive and COMSAT, be presumed to have been made during the Executive's
employment by COMSAT.

     8.   Termination.  This Agreement shall remain in effect during this
Employment Term, and this Agreement and Executive's employment with COMSAT may
be terminated only as follows:

          (a)   By Executive at any time upon 60 day advance written notice to
COMSAT should COMSAT, without Executive's express written consent,
substantially reduce (except in connection with the termination of his
employment voluntarily by Executive or by COMSAT for "cause" as defined below)
his responsibilities as Vice President of the Division.  At the end of the 60
day advance notice period, COMSAT shall pay Executive in a lump sum (subject
to withholding obligations as may be imposed by law) his then current Base
Salary for a period of one year.  In such event, COMSAT shall continue to pay
for the Executive's life, health and disability insurance coverage through the
remainder of the Employment Period hereunder to the extent that RSI paid for
such coverage under the RSI Employment Agreement.  All other fringe

                                       -4-

<PAGE>

benefits provided under this Agreement which have not vested shall cease upon
the effective date of termination, and COMSAT shall provide Executive such
health benefits as may be required under applicable COBRA law and regulation at
COMSAT's expense and without charge to Executive.

          (b)   For purposes of this Agreement, COMSAT shall have "cause" to
terminate the Executive's employment hereunder upon (i) the continued and
deliberate failure of the Executive to perform his duties, in a manner
substantially consistent with the manner prescribed by the President of COMSAT
or the President of the Division (other than any such failure resulting from
his incapacity due to physical or mental illness) which failure continues for
ten days following the Executive's receipt of written notice from the
President of COMSAT or the President of the Division specifying the manner in
which the Executive is in default of his duties, (ii) the engaging by the
Executive in serious misconduct that is materially and demonstrably injurious
to COMSAT, (iii) the conviction of the Executive of commission of a felony
involving a crime of moral turpitude, whether or not such felony was committed
in connection with COMSAT's business, or (iv) the circumstances described in
Section 9 hereof, in which case the provision of Section 9 shall govern the
rights and obligations of the parties.

     9.   Disability; Death.
          -----------------

          (a)   If, prior to the expiration or termination of the Employment
Period, the Executive shall be unable to perform his duties by reason of
disability or impairment of health for at least six consecutive calendar
months, COMSAT shall have the right to terminate this Agreement by giving 60
days written notice to the Executive to that effect, but only if at the time
such notice is given such disability or impairment is still continuing.
Following the expiration of the notice period, the Employment Period shall
terminate with the payment of the Executive's Base Salary for the month in
which notice is given.  In the event of a dispute as to whether the Executive
is disabled within the meaning of this Section 9(a), or the duration of any
disability, either party may request a medical examination of the Executive by
a doctor appointed by the Chief of Staff of a hospital selected by mutual
agreement of the parties, or as the parties may otherwise agree, and the
written medical opinion of such doctor shall be conclusive and binding upon
the parties as to whether the Executive has become disabled and the date when
such disability arose.  The cost of any such medical examinations shall be
borne by COMSAT.

          (b)   If, prior to the expiration or termination of the Employment
Period, the Executive shall die, COMSAT shall pay to the Executive's estate his
Base Salary through the end of the month in which the Executive's death

                                       -5-

<PAGE>

occurred, at which time the Employment Period shall terminate without further
notice and COMSAT shall have no further obligations hereunder.

          (c)   Nothing contained in this Section 9 shall impair or otherwise
affect any rights and interests of the Executive under any compensation plan or
arrangement of COMSAT which may be adopted by the Board.

     10.  Non-Competition.
          ---------------

          (a)   Except as provided in paragraph (d) below, the Executive agrees
that for a period commencing as of the Effective Date and running through the
earlier of (i) the end of the Employment Period if the Executive remains
employed by COMSAT for the entire Employment Period or (ii) one year following
termination of the Executive's employment by COMSAT for any reason, whether by
action of the Executive or COMSAT (the "Non-Competition Period"), the Executive
will not, except as otherwise provided herein, engage or participate, directly
or indirectly, as principal, agent, employee, employer, consultant,
stockholder, partner or in any other individual capacity whatsoever, in the
conduct or management of, or own any stock or any other equity investment in
or debt of, any business which is competitive with any business conducted by
the Division.

               For the purpose of this Agreement, a business shall be
considered to be competitive with the business of the Division only if such
business is engaged in providing services or products (i) similar to (x) any
service or product currently provided by the Division during the Employment
Period; (y) any service or product which evolves from or results from
enhancements in the ordinary course during the Non-Competition Period to the
services or products provided by the Division as of the date hereof or during
the Employment Period; or (z) any future service or product of the Division as
to which the Executive materially and substantially participated in the design
or enhancement, and (ii) to customers and clients of the type served by the
Division during the Non-Competition Period.

          (b)   Non-Solicitation of Employees.  During the Non-Competition
Period, the Executive will not (for his own benefit or for the benefit of any
person or entity other than COMSAT) solicit, or assist any person or entity
other than COMSAT to solicit, any officer, director, executive or employee of
COMSAT to leave his or her employment.

          (c)   Reasonableness.  The Executive acknowledges that (i) the
markets served by COMSAT are national and international and are not dependent
on the geographic location of the executive personnel or the businesses by
which they are employed, (ii) the length of the Non-Competition Period is

                                       -6-

<PAGE>

linked to the term of the Employment Period and the severance benefit provide
for in Section 8(a); and (iii) the above covenants are manifestly reasonable
on their face, and the parties expressly agree that such restrictions have
been designed to be reasonable and no greater than is required for the
protection of COMSAT.

          (d)   Investment.  Nothing in this Agreement shall be deemed to
prohibit the Executive from owning equity or debt investments in any
corporation, partnership or other entity which is competitive with COMSAT,
PROVIDED that such investments (i) are passive investments and constitute five
percent (5%) or less of the outstanding equity securities of such an entity the
equity securities of which are traded on a national securities exchange or
other public market, or (ii) are approved by the Board.

     11.  Enforcement.  The Executive agrees that COMSAT's remedies at law for
any breach or threat of breach by him of the provisions of Sections 5, 6, 7 and
10 hereof will be inadequate, and that COMSAT shall be entitled to an
injunction or injunctions to prevent breaches of the provisions of Sections 5,
6, 7 and 10 hereof and to enforce specifically the terms and provisions
thereof, in addition to any other remedy to which COMSAT may be entitled at
law or equity.

     12.  Arbitration
          -----------

          (a)   Subject to COMSAT's right to enforce Sections 5, 6, 7 and 10
hereof by an injunction issued by a court having jurisdiction (which right
shall prevail over and supersede the provisions of this Section 12), any
dispute relating to this Agreement, including the enforceability of this
Section 12, arising between the Executive and COMSAT or any of its affiliates
shall be settled by arbitration before a single arbitrator in accordance with
the commercial arbitration rules of the American Arbitration Association.

          (b)   The award of any such arbitrator shall be final.  Judgment upon
such award may be entered by the prevailing party in any federal or state court
sitting in Washington, D.C.

          (c)   The costs of arbitration proceedings, excluding attorneys fees,
shall be paid by the party that does not prevail in the arbitration
proceedings.

     13.  Severability.  Should any provision of this Agreement be
determined to be unenforceable or prohibited by any applicable law, such
provision shall be ineffective to the extent, and only to the extent, of such
unenforceability or prohibition without invalidating the balance of such
provision or any other provision of this Agreement, and any such

                                       -7-

<PAGE>

unenforceability or prohibition in any jurisdiction shall not invalidate or
render unenforceable such provision in any other jurisdiction.

     14.  Assignment.  The Executive's rights and obligations under this
Agreement shall not be assignable by the Executive.  COMSAT's rights and
obligations under this Agreement shall not be assignable by COMSAT except as
incident to the transfer, by merger or otherwise, of all or substantially all
of the business of the Division.  In the event of any assignment by COMSAT, all
rights of COMSAT hereunder shall inure to the benefit of the assignee.

     15.  Notices.  Any notice required or permitted under this Agreement shall
be deemed to have been effectively made or given if in writing and personally
delivered or mailed properly addressed in a sealed envelope, postage prepaid by
certified or registered mail.  Unless otherwise changed by notice, notice shall
be properly addressed to Executive if addressed to:

               R. Doss McComas
               409 Biggs Drive
               Front Royal, Virginia  22630

and properly addressed to COMSAT if addressed to:

               COMSAT Corporation
               6560 Rock Spring Drive
               Bethesda, Maryland  20817

               Attn:  Vice President, Human Resources
                        and Organization Development

     16.  Miscellaneous.  This Agreement constitutes the entire agreement, and
supersedes all prior agreements, of the parties hereto relating to the subject
matter hereof, and there are no written or oral terms or representatives made
by either party other than those contained herein.  The validity,
interpretation, performance and enforcement of the Agreement shall be governed
by the laws of the State of Maryland.  The headings contained herein are for
reference purposes only and shall not in any way affect the meaning or
interpretation of this Agreement.

                                       -8-

<PAGE>

     In WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the day and year first above written.

/s/ R. Doss McComas
- ------------------------------
R. Doss McComas, Executive
Including the Addendum to this
Employment Agreement dated
30 January 1994

COMSAT CORPORATION

By:/s/ Bruce L. Crockett
   -----------------------------
   Bruce L. Crockett
   President and Chief Executive
     Officer


CTS AMERICA, INC.

By:/s/ Richard E. Thomas
   ---------------------
   Richard E. Thomas
   President

                                       -9-


<PAGE>


      In consideration of the employment agreement executed this 30th day of
January, 1994, by and among COMSAT Corporation, a District of Columbia
corporation ("COMSAT"), CTS America, Inc., a Delaware corporation and a
wholly-owned subsidiary of COMSAT ("CTS"), and the undersigned officer of
Radiation Systems, Inc. ("RSI") (the "Executive"), Executive hereby agrees to
waive and rescind all or such portions of the provisions of Section 7 of the
amended employment agreement between Executive and RSI as Deloitte & Touche or
the Securities and Exchange Commission determine would preclude the use of
pooling accounting in conjunction with the proposed merger of RSI with and
into CTS.





                                    /S/ R. Doss McComas
                                    ----------------------------------
                                               Executive



Dated:  January 30, 1994
        ----------------




<PAGE>

                                                                 EXHIBIT 10(c)

                              EMPLOYMENT AGREEMENT
                              --------------------

     This AGREEMENT made as of the 30th day of January, 1994, by and among
COMSAT Corporation, a District of Columbia corporation ("COMSAT"), CTS America,
Inc., a Delaware corporation and a wholly owned subsidiary of COMSAT ("CTS"),
and Marvin D. Shoemake, a resident of the State of Georgia (the "Executive").

     WHEREAS, COMSAT and CTS have entered into an Agreement and Plan of Merger
(the "Merger Agreement"), dated as of January 30, 1994, among COMSAT, CTS, and
Radiation Systems, Inc., a Nevada corporation ("RSI"), pursuant to which RSI
will be merged with and into CTS (the "Merger"); and

     WHEREAS, the Executive currently serves as an officer of RSI;

     WHEREAS, the Executive is currently subject to an Employment Agreement, as
amended November 20, 1993, with RSI (the "RSI Employment Agreement"); and

     WHEREAS, COMSAT and CTS desire that the RSI Employment Agreement be
terminated at the time of consummation of the Merger; and

     WHEREAS, COMSAT desires to employ the Executive, and the Executive desires
to become an employee of COMSAT, on the terms and conditions set forth herein;

     NOW, THEREFORE, in consideration of the premises and the mutual agreements
made herein, and intending to be legally bound hereby, COMSAT and the Executive
agree as follows:

     1.   Employment; Termination of RSI Employment Agreement; Duties.
          -----------------------------------------------------------

          (a)   Employment and Employment Period.  COMSAT shall employ the
Executive to serve as Vice President of the COMSAT RSI Division or subsidiary or
other successor operating entity within COMSAT (the "Division") for a continuous
period of three (3) years (the "Employment Period") commencing on the "Effective
Date" (as such term is defined in Section 1.2 of the Merger Agreement).

          (b)   Termination of RSI Employment Agreement.  Effective on the
Effective Date, the RSI Employment Agreement shall be terminated and be of no
further force and effect.

          (c)   Offices, Duties and Responsibilities.  Effective on the
Effective Date, Executive shall be elected Vice President of the Division.
The Executive shall report to the President of the Division.  The Executive's
offices initially shall be located at RSI's present facilities in Duluth,

<PAGE>

Georgia, and shall during the Employment Period remain in the Atlanta, Georgia
metropolitan area.

          (d)   Devotion to Interests of COMSAT.  Except as expressly authorized
by the President of the Division, during the Employment Period the Executive
shall render his business services solely in the performance of his duties
hereunder.  The Executive shall use his best efforts to promote the interests
and welfare of COMSAT.

     2.   Compensation and Fringe Benefits.
          --------------------------------

          (a)   Base Compensation.  COMSAT shall pay the Executive a base salary
("Base Salary") at the rate of (i) $(RSI current salary plus $10,000) per year
through the end of the Employment Period, with payments made in installments in
accordance with COMSAT's regular practice for compensating executive personnel.
The Base Salary for the Executive shall be reviewed for merit-based increases at
least once each calendar year during the Employment Period consistent with
merit-based reviews for other COMSAT executives.  Such reviews shall occur
immediately prior to his "anniversary date" for performance reviews at RSI.

          (b)   Bonus Compensation.  For each year or partial year ending on
December 31 during the Employment Period, the Executive shall be eligible to
receive annual bonuses (payable in January) under the COMSAT Annual Incentive
Plan ("AIP") based upon performance.  The standards applied for performance
reviews of the Executive under the AIP shall be consistent with the standards
applied for performance reviews of other COMSAT executives whose salaries are in
the comparable range of the then current Base Salary of the Executive under this
Agreement.  Any performance bonuses so paid to Executive shall be subject to
deferral at Executive's election under the AIP.

          (c)   Fringe Benefits.  The Executive also shall be entitled to fringe
benefits including participation in the Division's group life insurance plan,
the COMSAT 1990 Key Employee Stock Plan (the "Option Plan"), the COMSAT Employee
Stock Purchase Plan, the COMSAT Dividend Reinvestment Plan, and health and
disability insurance programs of the Division and reimbursement of premiums for
insurance coverage and reasonable expenses incurred in connection with travel
and entertainment related to COMSAT's business and affairs.  The Executive also
shall be entitled to use existing balances of unused medical and legal reim-
bursement expense accounts with RSI until depleted.

          (d)   Retention Bonuses.  The Executive shall be entitled to receive
retention bonuses so long as he remains employed by COMSAT on the date such
bonuses are payable as follows:  (i) 90 days after the Effective Date, a

                                       -2-

<PAGE>

retention bonus of $25,000, (ii) on the first anniversary of the Effective Date,
a retention bonus of $27,000; (iii) on the second anniversary of the Effective
Date, a retention bonus of $29,000; and (iv) on the third anniversary of the
Effective Date, a retention bonus of $31,500.

     3.   Stock Options.  On the Effective Date, COMSAT shall grant to the
Executive nonstatutory stock options (the "Options") under the Option Plan to
purchase 7,000 shares of COMSAT's common stock, without par value ("Common
Stock"), at a purchase price equal to the closing price of the Common Stock on
the New York Stock Exchange on the date of the execution and delivery of the
Merger Agreement, or if such date is not a date on which the Common Stock has
traded, the first trading date immediately prior to execution and delivery of
the Merger Agreement.  Such Options shall be represented by a stock option
agreement ("Option Agreement") in the form and containing the terms customarily
used by COMSAT for such agreements including terms relating to the length of the
Option term, vesting conditions and termination of employment.

     4.   RSAs.  On the Effective Date, upon execution and delivery of this
Agreement, COMSAT shall grant the Executive 5,000 Restricted Stock Awards (RSAs)
under the Option Plan, which RSAs shall entitle Executive to receive dividends
(when and in the same amounts as dividends are paid on Common Stock) as provided
under the Option Plan.  The vesting of such RSAs shall be subject to the
satisfaction of objective performance standards to be adopted by the Board and
approved by COMSAT's shareholders.

     5.   Trade Secrets.  The Executive shall not (for his own benefit or the
benefit of any person or entity other than COMSAT) use or disclose any of
COMSAT's trade secrets or other confidential information.  The term "trade
secrets or other confidential information" includes, by way of example, matters
of a technical nature, such as scientific, trade and engineering secrets, "know-
how", formulae, secret processes or machines, inventions, computer programs
(including documentation of such programs) and research projects, and matters of
a business nature, such as proprietary information about costs, profits,
markets, sales, lists of customers, and other information of a similar nature to
the extent not available to the public, and plans for future development.  After
termination of this Agreement, the Executive shall not use or disclose trade
secrets or other confidential information unless such information becomes a part
of the public domain other than through a breach of this Agreement or is
disclosed to the Executive by a third party who is entitled to receive and
disclose such information.

                                       -3-

<PAGE>

     6.   Return of Documents and Property.  Upon the effective date of notice
of the Executive's or COMSAT's election to terminate this Agreement, or at any
time upon the request of COMSAT, the Executive (or his heirs or personal
representatives) shall deliver to COMSAT (a) all documents and materials
containing trade secrets or other confidential information relating to COMSAT's
business and affairs, and (b) all documents, materials and other property
belonging to COMSAT, which in either case are in the possession or under the
control of the Executive (or his heirs or personal representatives).

     7.   Discoveries and Works.  All discoveries and works made or conceived by
the Executive during his employment by COMSAT, jointly or with others, that
relate to COMSAT's activities shall be owned by COMSAT.  The term "discoveries
and works" include, by way of example, inventions, computer programs (including
documentation of such programs), technical improvements, processes, drawings and
work of authorship.  The Executive shall (a) promptly notify, make full
disclosure to, and execute and deliver any documents requested by, COMSAT to
evidence or better assure title to such discoveries and works in COMSAT,
(b) assist COMSAT in obtaining or maintaining for itself at its own expense
United States and foreign patents, copyrights, trade secret protection or other
protection of any and all such discoveries and works, and (c) promptly execute,
whether during his employment or thereafter, all applications or other
endorsements necessary or appropriate to maintain patents and other rights for
COMSAT and to protect its title thereto.  Any discoveries and works which,
within six months after the termination of the Executive's employment by COMSAT,
are made, disclosed, reduced to a tangible or written form or description, or
are reduced to practice by the Executive and which pertain to work performed by
the Executive while with COMSAT and RSI shall, as between the Executive and
COMSAT, be presumed to have been made during the Executive's employment by
COMSAT.

     8.   Termination.  This Agreement shall remain in effect during this
Employment Term, and this Agreement and Executive's employment with COMSAT may
be terminated only as follows:

          (a)   By Executive at any time upon 60 day advance written notice to
COMSAT should COMSAT, without Executive's express written consent, substantially
reduce (except in connection with the termination of his employment voluntarily
by Executive or by COMSAT for "cause" as defined below) his responsibilities as
Vice President of the Division.  At the end of the 60 day advance notice period,
COMSAT shall pay Executive in a lump sum (subject to withholding obligations as
may be imposed by law) his then current Base Salary for a period of one year.
In such event, COMSAT shall continue to pay for the Executive's life, health and
disability insurance coverage through the remainder of the Employment Period

                                       -4-

<PAGE>

hereunder to the extent that RSI paid for such coverage under the RSI Employment
Agreement.  All other fringe benefits provided under this Agreement which have
not vested shall cease upon the effective date of termination, and COMSAT shall
provide Executive such health benefits as may be required under applicable COBRA
law and regulation at COMSAT's expense and without charge to Executive.

          (b)   For purposes of this Agreement, COMSAT shall have "cause" to
terminate the Executive's employment hereunder upon (i) the continued and
deliberate failure of the Executive to perform his duties, in a manner
substantially consistent with the manner prescribed by the President of COMSAT
or the President of the Division (other than any such failure resulting from his
incapacity due to physical or mental illness) which failure continues for ten
days following the Executive's receipt of written notice from the President of
COMSAT or the President of the Division specifying the manner in which the
Executive is in default of his duties, (ii) the engaging by the Executive in
serious misconduct that is materially and demonstrably injurious to COMSAT,
(iii) the conviction of the Executive of commission of a felony involving a
crime of moral turpitude, whether or not such felony was committed in connection
with COMSAT's business, or (iv) the circumstances described in Section 9 hereof,
in which case the provision of Section 9 shall govern the rights and obligations
of the parties.

     9.   Disability; Death.
          -----------------

          (a)   If, prior to the expiration or termination of the Employment
Period, the Executive shall be unable to perform his duties by reason of
disability or impairment of health for at least six consecutive calendar months,
COMSAT shall have the right to terminate this Agreement by giving 60 days
written notice to the Executive to that effect, but only if at the time such
notice is given such disability or impairment is still continuing.  Following
the expiration of the notice period, the Employment Period shall terminate with
the payment of the Executive's Base Salary for the month in which notice is
given.  In the event of a dispute as to whether the Executive is disabled within
the meaning of this Section 9(a), or the duration of any disability, either
party may request a medical examination of the Executive by a doctor appointed
by the Chief of Staff of a hospital selected by mutual agreement of the parties,
or as the parties may otherwise agree, and the written medical opinion of such
doctor shall be conclusive and binding upon the parties as to whether the
Executive has become disabled and the date when such disability arose.  The cost
of any such medical examinations shall be borne by COMSAT.

                                       -5-

<PAGE>

          (b)   If, prior to the expiration or termination of the Employment
Period, the Executive shall die, COMSAT shall pay to the Executive's estate his
Base Salary through the end of the month in which the Executive's death
occurred, at which time the Employment Period shall terminate without further
notice and COMSAT shall have no further obligations hereunder.

          (c)   Nothing contained in this Section 9 shall impair or otherwise
affect any rights and interests of the Executive under any compensation plan or
arrangement of COMSAT which may be adopted by the Board.

     10.  Non-Competition.
          ---------------

          (a)   Except as provided in paragraph (d) below, the Executive agrees
that for a period commencing as of the Effective Date and running through the
earlier of (i) the end of the Employment Period if the Executive remains
employed by COMSAT for the entire Employment Period or (ii) one year following
termination of the Executive's employment by COMSAT for any reason, whether by
action of the Executive or COMSAT (the "Non-Competition Period"), the Executive
will not, except as otherwise provided herein, engage or participate, directly
or indirectly, as principal, agent, employee, employer, consultant, stockholder,
partner or in any other individual capacity whatsoever, in the conduct or
management of, or own any stock or any other equity investment in or debt of,
any business which is competitive with any business conducted by the Division.

               For the purpose of this Agreement, a business shall be considered
to be competitive with the business of the  Division only if such business is
engaged in providing services or products (i) similar to (x) any service or
product currently provided by the Division during the Employment Period; (y) any
service or product which evolves from or results from enhancements in the
ordinary course during the Non-Competition Period to the services or products
provided by the Division as of the date hereof or during the Employment Period;
or (z) any future service or product of the Division as to which the Executive
materially and substantially participated in the design or enhancement, and
(ii) to customers and clients of the type served by the Division during the Non-
Competition Period.

          (b)   Non-Solicitation of Employees.  During the Non-Competition
Period, the Executive will not (for his own benefit or for the benefit of any
person or entity other than COMSAT) solicit, or assist any person or entity
other than COMSAT to solicit, any officer, director, executive or employee of
COMSAT to leave his or her employment.

                                       -6-

<PAGE>

          (c)   Reasonableness.  The Executive acknowledges that (i) the markets
served by COMSAT are national and international and are not dependent on the
geographic location of the executive personnel or the businesses by which they
are employed, (ii) the length of the Non-Competition Period is linked to the
term of the Employment Period and the severance benefit provide for in Section
8(a); and (iii) the above covenants are manifestly reasonable on their face, and
the parties expressly agree that such restrictions have been designed to be
reasonable and no greater than is required for the protection of COMSAT.

          (c)   Investment.  Nothing in this Agreement shall be deemed to
prohibit the Executive from owning equity or debt investments in any
corporation, partnership or other entity which is competitive with COMSAT,
PROVIDED that such investments (i) are passive investments and constitute five
percent (5%) or less of the outstanding equity securities of such an entity the
equity securities of which are traded on a national securities exchange or other
public market, or (ii) are approved by the Board.

     11.  Enforcement.  The Executive agrees that COMSAT's remedies at law for
any breach or threat of breach by him of the provisions of Sections 5, 6, 7 and
10 hereof will be inadequate, and that COMSAT shall be entitled to an injunction
or injunctions to prevent breaches of the provisions of Sections 5, 6, 7 and 10
hereof and to enforce specifically the terms and provisions thereof, in addition
to any other remedy to which COMSAT may be entitled at law or equity.

     12.  Arbitration
          -----------

          (a)   Subject to COMSAT's right to enforce Sections 5, 6, 7 and 10
hereof by an injunction issued by a court having jurisdiction (which right shall
prevail over and supersede the provisions of this Section 12), any dispute
relating to this Agreement, including the enforceability of this Section 12,
arising between the Executive and COMSAT or any of its affiliates shall be
settled by arbitration before a single arbitrator in accordance with the
commercial arbitration rules of the American Arbitration Association.

          (b)   The award of any such arbitrator shall be final.  Judgment upon
such award may be entered by the prevailing party in any federal or state court
sitting in Washington, D.C.

          (c)   The costs of arbitration proceedings, excluding attorneys fees,
shall be paid by the party that does not prevail in the arbitration proceedings.

                                       -7-

<PAGE>

     13.  Severability.  Should any provision of this Agreement be
determined to be unenforceable or prohibited by any applicable law, such
provision shall be ineffective to the extent, and only to the extent, of such
unenforceability or prohibition without invalidating the balance of such
provision or any other provision of this Agreement, and any such
unenforceability or prohibition in any jurisdiction shall not invalidate or
render unenforceable such provision in any other jurisdiction.

     14.  Assignment.  The Executive's rights and obligations under this
Agreement shall not be assignable by the Executive.  COMSAT's rights and
obligations under this Agreement shall not be assignable by COMSAT except as
incident to the transfer, by merger or otherwise, of all or substantially all of
the business of the Division.  In the event of any assignment by COMSAT, all
rights of COMSAT hereunder shall inure to the benefit of the assignee.

     15.  Notices.  Any notice required or permitted under this Agreement shall
be deemed to have been effectively made or given if in writing and personally
delivered or mailed properly addressed in a sealed envelope, postage prepaid by
certified or registered mail.  Unless otherwise changed by notice, notice shall
be properly addressed to Executive if addressed to:

               Marvin Shoemake
               1424 Stoney Point Road
               Cumming, Georgia  30131

and properly addressed to COMSAT if addressed to:

               COMSAT Corporation
               6560 Rock Spring Drive
               Bethesda, Maryland  20817

               Attn:  Vice President, Human Resources
                        and Organization Development

     16.  Miscellaneous.  This Agreement constitutes the entire agreement, and
supersedes all prior agreements, of the parties hereto relating to the subject
matter hereof, and there are no written or oral terms or representatives made by
either party other than those contained herein.  The validity, interpretation,
performance and enforcement of the Agreement shall be governed by the laws of
the State of Maryland.  The headings contained herein are for reference purposes
only and shall not in any way affect the meaning or interpretation of this
Agreement.

                                       -8-

<PAGE>

      In WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the day and year first above written.

/s/ Marvin D. Shoemake
- -----------------------------
Marvin D. Shoemake, Executive
Including Attached Addendum
dated 30 January 1994

COMSAT CORPORATION

By:/s/ Bruce L. Crockett
   -----------------------------
   Bruce L. Crockett
   President and Chief Executive
     Officer


CTS AMERICA, INC.

By:/s/ Richard E. Thomas
   ---------------------
   Richard E. Thomas
   President

                                       -9-

<PAGE>

     In consideration of the employment agreement executed this 30th day of
January, 1994, by and among COMSAT Corporation, a District of Columbia
corporation ("COMSAT"), CTS America, Inc., a Delaware corporation and a wholly-
owned subsidiary of COMSAT ("CTS"), and the undersigned officer of Radiation
Systems, Inc. ("RSI") (the "Executive"), Executive hereby agrees to waive and
rescind all or such portions of the provisions of Section 7 of the amended
employment agreement between Executive and RSI as Deloitte & Touche or the
Securities and Exchange Commission determine would preclude the use of pooling
accounting in conjunction with the proposed merger of RSI with and into CTS.


                              /s/ Marvin D. Shoemake
                              -----------------------------------
                                         Executive



Dated:  January 30, 1994
        ----------------




<PAGE>

                                                                EXHIBIT 10(d)

                              EMPLOYMENT AGREEMENT
                              --------------------

     This AGREEMENT made as of the 30th day of January, 1994, by and among
COMSAT Corporation, a District of Columbia corporation ("COMSAT"), CTS America,
Inc., a Delaware corporation and a wholly owned subsidiary of COMSAT ("CTS"),
and Mark D. Funston, a resident of the State of Maryland (the "Executive").

     WHEREAS, COMSAT and CTS have entered into an Agreement and Plan of Merger
(the "Merger Agreement"), dated as of January 30, 1994, among COMSAT, CTS, and
Radiation Systems, Inc., a Nevada corporation ("RSI"), pursuant to which RSI
will be merged with and into CTS (the "Merger"); and

     WHEREAS, the Executive currently serves as an officer of RSI;

     WHEREAS, the Executive is currently subject to an Employment Agreement, as
amended November 20, 1993, with RSI (the "RSI Employment Agreement"); and

     WHEREAS, COMSAT and CTS desire that the RSI Employment Agreement be
terminated at the time of consummation of the Merger; and

     WHEREAS, COMSAT desires to employ the Executive, and the Executive desires
to become an employee of COMSAT, on the terms and conditions set forth herein;

     NOW, THEREFORE, in consideration of the premises and the mutual agreements
made herein, and intending to be legally bound hereby, COMSAT and the Executive
agree as follows:

     1.   Employment; Termination of RSI Employment Agreement; Duties.
          -----------------------------------------------------------

          (a)   Employment and Employment Period.  COMSAT shall employ the
Executive to serve as Vice President of the COMSAT RSI Division or subsidiary or
other successor operating entity within COMSAT (the "Division") for a continuous
period of three (3) years (the "Employment Period") commencing on the "Effective
Date" (as such term is defined in Section 1.2 of the Merger Agreement).

          (b)   Termination of RSI Employment Agreement.  Effective on the
Effective Date, the RSI Employment Agreement shall be terminated and be of no
further force and effect.

          (c)   Offices, Duties and Responsibilities.  Effective on the
Effective Date, Executive shall be elected Vice President of the Division.
The Executive shall report to the President of the Division.  The Executive's
offices initially shall be located at RSI's present headquarters building in

<PAGE>

Sterling, Virginia, and shall during the Employment Period remain in the
Washington, D.C. metropolitan area.

          (d)   Devotion to Interests of COMSAT.  Except as expressly authorized
by the President of the Division, during the Employment Period the Executive
shall render his business services solely in the performance of his duties
hereunder.  The Executive shall use his best efforts to promote the interests
and welfare of COMSAT.

     2.   Compensation and Fringe Benefits.
          --------------------------------

          (a)   Base Compensation.  COMSAT shall pay the Executive a base salary
("Base Salary") at the rate of (i) $(RSI current salary plus $10,000) per year
through the end of the Employment Period, with payments made in installments in
accordance with COMSAT's regular practice for compensating executive personnel.
The Base Salary for the Executive shall be reviewed for merit-based increases at
least once each calendar year during the Employment Period consistent with
merit-based reviews for other COMSAT executives.  Such reviews shall occur
immediately prior to his "anniversary date" for performance reviews at RSI.

          (b)   Bonus Compensation.  For each year or partial year ending on
December 31 during the Employment Period, the Executive shall be eligible to
receive annual bonuses (payable in January) under the COMSAT Annual Incentive
Plan ("AIP") based upon performance.  The standards applied for performance
reviews of the Executive under the AIP shall be consistent with the standards
applied for performance reviews of other COMSAT executives whose salaries are in
the comparable range of the then current Base Salary of the Executive under this
Agreement.  Any performance bonuses so paid to Executive shall be subject to
deferral at Executive's election under the AIP.

          (c)   Fringe Benefits.  The Executive also shall be entitled to fringe
benefits including participation in the Division's group life insurance plan,
the COMSAT 1990 Key Employee Stock Plan (the "Option Plan"), the COMSAT Employee
Stock Purchase Plan, the COMSAT Dividend Reinvestment Plan, and health and
disability insurance programs of the Division and reimbursement of premiums for
insurance coverage and reasonable expenses incurred in connection with travel
and entertainment related to COMSAT's business and affairs.  The Executive also
shall be entitled to use existing balances of unused medical and legal reim-
bursement expense accounts with RSI until depleted.

          (d)   Retention Bonuses.  The Executive shall be entitled to receive
retention bonuses so long as he remains employed by COMSAT on the date such
bonuses are payable as follows:

                                       -2-

<PAGE>

(i) 90 days after the Effective Date, a retention bonus of $25,000, (ii) on the
first anniversary of the Effective Date, a retention bonus of $27,000; (iii) on
the second anniversary of the Effective Date, a retention bonus of $29,000; and
(iv) on the third anniversary of the Effective Date, a retention bonus of
$31,500.

     3.   Stock Options.  On the Effective Date, COMSAT shall grant to the
Executive nonstatutory stock options (the "Options") under the Option Plan to
purchase 7,000 shares of COMSAT's common stock, without par value ("Common
Stock"), at a purchase price equal to the closing price of the Common Stock on
the New York Stock Exchange on the date of the execution and delivery of the
Merger Agreement, or if such date is not a date on which the Common Stock has
traded, the first trading date immediately prior to execution and delivery of
the Merger Agreement.  Such Options shall be represented by a stock option
agreement ("Option Agreement") in the form and containing the terms customarily
used by COMSAT for such agreements including terms relating to the length of the
Option term, vesting conditions and termination of employment.

     4.   RSAs.  On the Effective Date, upon execution and delivery of this
Agreement, COMSAT shall grant the Executive 5,000 Restricted Stock Awards (RSAs)
under the Option Plan, which RSAs shall entitle Executive to receive dividends
(when and in the same amounts as dividends are paid on Common Stock) as provided
under the Option Plan.  The vesting of such RSAs shall be subject to the
satisfaction of objective performance standards to be adopted by the Board and
approved by COMSAT's shareholders.

     5.   Trade Secrets.  The Executive shall not (for his own benefit or the
benefit of any person or entity other than COMSAT) use or disclose any of
COMSAT's trade secrets or other confidential information.  The term "trade
secrets or other confidential information" includes, by way of example, matters
of a technical nature, such as scientific, trade and engineering secrets, "know-
how", formulae, secret processes or machines, inventions, computer programs
(including documentation of such programs) and research projects, and matters of
a business nature, such as proprietary information about costs, profits,
markets, sales, lists of customers, and other information of a similar nature to
the extent not available to the public, and plans for future development.  After
termination of this Agreement, the Executive shall not use or disclose trade
secrets or other confidential information unless such information becomes a part
of the public domain other than through a breach of this Agreement or is
disclosed to the Executive by a third party who is entitled to receive and
disclose such information.

                                       -3-

<PAGE>

     6.   Return of Documents and Property.  Upon the effective date of notice
of the Executive's or COMSAT's election to terminate this Agreement, or at any
time upon the request of COMSAT, the Executive (or his heirs or personal
representatives) shall deliver to COMSAT (a) all documents and materials
containing trade secrets or other confidential information relating to COMSAT's
business and affairs, and (b) all documents, materials and other property
belonging to COMSAT, which in either case are in the possession or under the
control of the Executive (or his heirs or personal representatives).

     7.   Discoveries and Works.  All discoveries and works made or conceived by
the Executive during his employment by COMSAT, jointly or with others, that
relate to COMSAT's activities shall be owned by COMSAT.  The term "discoveries
and works" include, by way of example, inventions, computer programs (including
documentation of such programs), technical improvements, processes, drawings and
work of authorship.  The Executive shall (a) promptly notify, make full
disclosure to, and execute and deliver any documents requested by, COMSAT to
evidence or better assure title to such discoveries and works in COMSAT,
(b) assist COMSAT in obtaining or maintaining for itself at its own expense
United States and foreign patents, copyrights, trade secret protection or other
protection of any and all such discoveries and works, and (c) promptly execute,
whether during his employment or thereafter, all applications or other
endorsements necessary or appropriate to maintain patents and other rights for
COMSAT and to protect its title thereto.  Any discoveries and works which,
within six months after the termination of the Executive's employment by COMSAT,
are made, disclosed, reduced to a tangible or written form or description, or
are reduced to practice by the Executive and which pertain to work performed by
the Executive while with COMSAT and RSI shall, as between the Executive and
COMSAT, be presumed to have been made during the Executive's employment by
COMSAT.

     8.   Termination.  This Agreement shall remain in effect during this
Employment Term, and this Agreement and Executive's employment with COMSAT may
be terminated only as follows:

          (a)   By Executive at any time upon 60 day advance written notice to
COMSAT should COMSAT, without Executive's express written consent, substantially
reduce (except in connection with the termination of his employment voluntarily
by Executive or by COMSAT for "cause" as defined below) his responsibilities as
Vice President of the Division.  At the end of the 60 day advance notice period,
COMSAT shall pay Executive in a lump sum (subject to withholding obligations as
may be imposed by law) his then current Base Salary for a period of one year.
In such event, COMSAT shall continue to pay for the Executive's life, health and
disability insurance coverage through the remainder of the Employment Period

                                       -4-

<PAGE>

hereunder to the extent that RSI paid for such coverage under the RSI Employment
Agreement.  All other fringe benefits provided under this Agreement which have
not vested shall cease upon the effective date of termination, and COMSAT shall
provide Executive such health benefits as may be required under applicable COBRA
law and regulation at COMSAT's expense and without charge to Executive.

          (b)   For purposes of this Agreement, COMSAT shall have "cause" to
terminate the Executive's employment hereunder upon (i) the continued and
deliberate failure of the Executive to perform his duties, in a manner
substantially consistent with the manner prescribed by the President of COMSAT
or the President of the Division (other than any such failure resulting from his
incapacity due to physical or mental illness) which failure continues for ten
days following the Executive's receipt of written notice from the President of
COMSAT or the President of the Division specifying the manner in which the
Executive is in default of his duties, (ii) the engaging by the Executive in
serious misconduct that is materially and demonstrably injurious to COMSAT,
(iii) the conviction of the Executive of commission of a felony involving a
crime of moral turpitude, whether or not such felony was committed in connection
with COMSAT's business, or (iv) the circumstances described in Section 9 hereof,
in which case the provision of Section 9 shall govern the rights and obligations
of the parties.

     9.   Disability; Death.
          -----------------

          (a)   If, prior to the expiration or termination of the Employment
Period, the Executive shall be unable to perform his duties by reason of
disability or impairment of health for at least six consecutive calendar months,
COMSAT shall have the right to terminate this Agreement by giving 60 days
written notice to the Executive to that effect, but only if at the time such
notice is given such disability or impairment is still continuing.  Following
the expiration of the notice period, the Employment Period shall terminate with
the payment of the Executive's Base Salary for the month in which notice is
given.  In the event of a dispute as to whether the Executive is disabled within
the meaning of this Section 9(a), or the duration of any disability, either
party may request a medical examination of the Executive by a doctor appointed
by the Chief of Staff of a hospital selected by mutual agreement of the parties,
or as the parties may otherwise agree, and the written medical opinion of such
doctor shall be conclusive and binding upon the parties as to whether the
Executive has become disabled and the date when such disability arose.  The cost
of any such medical examinations shall be borne by COMSAT.

                                       -5-

<PAGE>

          (b)   If, prior to the expiration or termination of the Employment
Period, the Executive shall die, COMSAT shall pay to the Executive's estate his
Base Salary through the end of the month in which the Executive's death
occurred, at which time the Employment Period shall terminate without further
notice and COMSAT shall have no further obligations hereunder.

          (c)   Nothing contained in this Section 9 shall impair or otherwise
affect any rights and interests of the Executive under any compensation plan or
arrangement of COMSAT which may be adopted by the Board.

     10.  Non-Competition.
          ---------------

          (a)   Except as provided in paragraph (d) below, the Executive agrees
that for a period commencing as of the Effective Date and running through the
earlier of (i) the end of the Employment Period if the Executive remains
employed by COMSAT for the entire Employment Period or (ii) one year following
termination of the Executive's employment by COMSAT for any reason, whether by
action of the Executive or COMSAT (the "Non-Competition Period"), the Executive
will not, except as otherwise provided herein, engage or participate, directly
or indirectly, as principal, agent, employee, employer, consultant, stockholder,
partner or in any other individual capacity whatsoever, in the conduct or
management of, or own any stock or any other equity investment in or debt of,
any business which is competitive with any business conducted by the Division.

          For the purpose of this Agreement, a business shall be considered to
be competitive with the business of the Division only if such business is
engaged in providing services or products (i) similar to (x) any service or
product currently provided by the Division during the Employment Period; (y) any
service or product which evolves from or results from enhancements in the
ordinary course during the Non-Competition Period to the services or products
provided by the Division as of the date hereof or during the Employment Period;
or (z) any future service or product of the Division as to which the Executive
materially and substantially participated in the design or enhancement, and
(ii) to customers and clients of the type served by the Division during the Non-
Competition Period.

          (b)   Non-Solicitation of Employees.  During the Non-Competition
Period, the Executive will not (for his own benefit or for the benefit of any
person or entity other than COMSAT) solicit, or assist any person or entity
other than COMSAT to solicit, any officer, director, executive or employee of
COMSAT to leave his or her employment.

                                       -6-

<PAGE>

          (c)   Reasonableness.  The Executive acknowledges that (i) the markets
served by COMSAT are national and international and are not dependent on the
geographic location of the executive personnel or the businesses by which they
are employed, (ii) the length of the Non-Competition Period is linked to the
term of the Employment Period and the severance benefit provide for in Section
8(a); and (iii) the above covenants are manifestly reasonable on their face, and
the parties expressly agree that such restrictions have been designed to be
reasonable and no greater than is required for the protection of COMSAT.

          (d)   Investment.  Nothing in this Agreement shall be deemed to
prohibit the Executive from owning equity or debt investments in any
corporation, partnership or other entity which is competitive with COMSAT,
PROVIDED that such investments (i) are passive investments and constitute five
percent (5%) or less of the outstanding equity securities of such an entity the
equity securities of which are traded on a national securities exchange or other
public market, or (ii) are approved by the Board.

     11.  Enforcement.  The Executive agrees that COMSAT's remedies at law for
any breach or threat of breach by him of the provisions of Sections 5, 6, 7 and
10 hereof will be inadequate, and that COMSAT shall be entitled to an injunction
or injunctions to prevent breaches of the provisions of Sections 5, 6, 7 and 10
hereof and to enforce specifically the terms and provisions thereof, in addition
to any other remedy to which COMSAT may be entitled at law or equity.

     12.  Arbitration
          -----------

          (a)   Subject to COMSAT's right to enforce Sections 5, 6, 7 and 10
hereof by an injunction issued by a court having jurisdiction (which right shall
prevail over and supersede the provisions of this Section 12), any dispute
relating to this Agreement, including the enforceability of this Section 12,
arising between the Executive and COMSAT or any of its affiliates shall be
settled by arbitration before a single arbitrator in accordance with the
commercial arbitration rules of the American Arbitration Association.

          (b)   The award of any such arbitrator shall be final.  Judgment upon
such award may be entered by the prevailing party in any federal or state court
sitting in Washington, D.C.

          (c)   The costs of arbitration proceedings, excluding attorneys fees,
shall be paid by the party that does not prevail in the arbitration proceedings.

                                       -7-

<PAGE>

     13.  Severability.  Should any provision of this Agreement be
determined to be unenforceable or prohibited by any applicable law, such
provision shall be ineffective to the extent, and only to the extent, of such
unenforceability or prohibition without invalidating the balance of such
provision or any other provision of this Agreement, and any such
unenforceability or prohibition in any jurisdiction shall not invalidate or
render unenforceable such provision in any other jurisdiction.

     14.  Assignment.  The Executive's rights and obligations under this
Agreement shall not be assignable by the Executive.  COMSAT's rights and
obligations under this Agreement shall not be assignable by COMSAT except as
incident to the transfer, by merger or otherwise, of all or substantially all of
the business of the Division.  In the event of any assignment by COMSAT, all
rights of COMSAT hereunder shall inure to the benefit of the assignee.

     15.  Notices.  Any notice required or permitted under this Agreement shall
be deemed to have been effectively made or given if in writing and personally
delivered or mailed properly addressed in a sealed envelope, postage prepaid by
certified or registered mail.  Unless otherwise changed by notice, notice shall
be properly addressed to Executive if addressed to:

               Mark D. Funston
               1095 Larkspur Terrace
               Rockville, Maryland  20850

and properly addressed to COMSAT if addressed to:

               COMSAT Corporation
               6560 Rock Spring Drive
               Bethesda, Maryland  20817

               Attn:  Vice President, Human Resources
                        and Organization Development

     16.  Miscellaneous.  This Agreement constitutes the entire agreement, and
supersedes all prior agreements, of the parties hereto relating to the subject
matter hereof, and there are no written or oral terms or representatives made by
either party other than those contained herein.  The validity, interpretation,
performance and enforcement of the Agreement shall be governed by the laws of
the State of Maryland.  The headings contained herein are for reference purposes
only and shall not in any way affect the meaning or interpretation of this
Agreement.

                                       -8-

<PAGE>

      In WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the day and year first above written.

/s/ Mark D. Funston
- ---------------------------
Mark D. Funston, Executive
Including Attached Addendum
dated 30 January 1994

COMSAT CORPORATION

By:/s/ Bruce L. Crockett
   -----------------------------
   Bruce L. Crockett
   President and Chief Executive
     Officer


CTS AMERICA, INC.

By:/s/ Richard E. Thomas
   ---------------------
   Richard E. Thomas
   President

                                       -9-

<PAGE>

                                                                   EXHIBIT 10(d)

     In consideration of the employment agreement executed this 30th day of
January, 1994, by and among COMSAT Corporation, a District of Columbia
corporation ("COMSAT"), CTS America, Inc., a Delaware corporation and a wholly-
owned subsidiary of COMSAT ("CTS"), and the undersigned officer of Radiation
Systems, Inc. ("RSI") (the "Executive"), Executive hereby agrees to waive and
rescind all or such portions of the provisions of Section 7 of the amended
employment agreement between Executive and RSI as Deloitte & Touche or the
Securities and Exchange Commission determine would preclude the use of pooling
accounting in conjunction with the proposed merger of RSI with and into CTS.


                              /s/ Mark D. Funston
                              ---------------------------------
                                         Executive



Dated:  January 30, 1994
        ----------------


<PAGE>

                                                                 EXHIBIT 10(e)

                            EMPLOYMENT AGREEMENT
                            --------------------

     This AGREEMENT made as of the 30th day of January, 1994, by and among
COMSAT Corporation, a District of Columbia corporation ("COMSAT"), CTS
America, Inc., a Delaware corporation and a wholly owned subsidiary of COMSAT
("CTS"), and William A. Thomas, a resident of the Commonwealth of Virginia
(the "Executive").

     WHEREAS, COMSAT and CTS have entered into an Agreement and Plan of
Merger (the "Merger Agreement"), dated as of January 30, 1994, among COMSAT,
CTS, and Radiation Systems, Inc., a Nevada corporation ("RSI"), pursuant to
which RSI will be merged with and into CTS (the "Merger"); and

     WHEREAS, the Executive currently serves as an officer of RSI;

     WHEREAS, the Executive is currently subject to an Employment Agreement,
as amended November 20, 1993, with RSI (the "RSI Employment Agreement"); and

     WHEREAS, COMSAT and CTS desire that the RSI Employment Agreement be
terminated at the time of consummation of the Merger; and

     WHEREAS, COMSAT desires to employ the Executive, and the Executive
desires to become an employee of COMSAT, on the terms and conditions set
forth herein;

     NOW, THEREFORE, in consideration of the premises and the mutual
agreements made herein, and intending to be legally bound hereby, COMSAT and
the Executive agree as follows:

     1.   Employment; Termination of RSI Employment Agreement; Duties.
          -----------------------------------------------------------

          (a)   Employment and Employment Period.  COMSAT shall employ the
Executive to serve as Vice President of the COMSAT RSI Division or subsidiary
or other successor operating entity within COMSAT (the "Division") for a
continuous period of three (3) years (the "Employment Period") commencing on
the "Effective Date" (as such term is defined in Section 1.2 of the Merger
Agreement).

          (b)   Termination of RSI Employment Agreement.  Effective on the
Effective Date, the RSI Employment Agreement shall be terminated and be of no
further force and effect.

          (c)   Offices, Duties and Responsibilities.  Effective on the
Effective Date, Executive shall be elected Vice President of the Division.
The Executive shall report to the President of the Division.  The Executive's
offices initially shall be located at RSI's present headquarters building in

<PAGE>

Sterling, Virginia, and shall during the Employment Period remain in the
Washington, D.C. metropolitan area.

          (d)   Devotion to Interests of COMSAT.  Except as expressly
authorized by the President of the Division, during the Employment Period the
Executive shall render his business services solely in the performance of his
duties hereunder.  The Executive shall use his best efforts to promote the
interests and welfare of COMSAT.

     2.   Compensation and Fringe Benefits.
          --------------------------------

          (a)   Base Compensation.  COMSAT shall pay the Executive a base
salary ("Base Salary") at the rate of (i) $(RSI current salary plus $10,000)
per year through the end of the Employment Period, with payments made in
installments in accordance with COMSAT's regular practice for compensating
executive personnel.  The Base Salary for the Executive shall be reviewed for
merit-based increases at least once each calendar year during the Employment
Period consistent with merit-based reviews for other COMSAT executives.  Such
reviews shall occur immediately prior to his "anniversary date" for
performance reviews at RSI.

          (b)   Bonus Compensation.  For each year or partial year ending on
December 31 during the Employment Period, the Executive shall be eligible to
receive annual bonuses (payable in January) under the COMSAT Annual Incentive
Plan ("AIP") based upon performance.  The standards applied for performance
reviews of the Executive under the AIP shall be consistent with the standards
applied for performance reviews of other COMSAT executives whose salaries are
in the comparable range of the then current Base Salary of the Executive
under this Agreement.  Any performance bonuses so paid to Executive shall be
subject to deferral at Executive's election under the AIP.

          (c)   Fringe Benefits.  The Executive also shall be entitled to
fringe benefits including participation in the Division's group life
insurance plan, the COMSAT 1990 Key Employee Stock Plan (the "Option Plan"),
the COMSAT Employee Stock Purchase Plan, the COMSAT Dividend Reinvestment
Plan, and health and disability insurance programs of the Division and
reimbursement of premiums for insurance coverage and reasonable expenses
incurred in connection with travel and entertainment related to COMSAT's
business and affairs.  The Executive also shall be entitled to use existing
balances of unused medical and legal reimbursement expense accounts with RSI
until depleted.

          (d)   Retention Bonuses.  The Executive shall be entitled to receive
retention bonuses so long as he remains employed by COMSAT on the date such
bonuses are payable as follows:

                                     -2-

<PAGE>

(i) 90 days after the Effective Date, a retention bonus of $25,000, (ii) on
the first anniversary of the Effective Date, a retention bonus of $27,000;
(iii) on the second anniversary of the Effective Date, a retention bonus of
$29,000; and (iv) on the third anniversary of the Effective Date, a retention
bonus of $31,500.

     3.   Stock Options.  On the Effective Date, COMSAT shall grant to the
Executive nonstatutory stock options (the "Options") under the Option Plan to
purchase 7,000 shares of COMSAT's common stock, without par value ("Common
Stock"), at a purchase price equal to the closing price of the Common Stock
on the New York Stock Exchange on the date of the execution and delivery of
the Merger Agreement, or if such date is not a date on which the Common Stock
has traded, the first trading date immediately prior to execution and
delivery of the Merger Agreement.  Such Options shall be represented by a
stock option agreement ("Option Agreement") in the form and containing the
terms customarily used by COMSAT for such agreements including terms relating
to the length of the Option term, vesting conditions and termination of
employment.

     4.   RSAs.  On the Effective Date, upon execution and delivery of this
Agreement, COMSAT shall grant the Executive 5,000 Restricted Stock Awards
(RSAs) under the Option Plan, which RSAs shall entitle Executive to receive
dividends (when and in the same amounts as dividends are paid on Common
Stock) as provided under the Option Plan.  The vesting of such RSAs shall be
subject to the satisfaction of objective performance standards to be adopted
by the Board and approved by COMSAT's shareholders.

     5.   Trade Secrets.  The Executive shall not (for his own benefit or the
benefit of any person or entity other than COMSAT) use or disclose any of
COMSAT's trade secrets or other confidential information.  The term "trade
secrets or other confidential information" includes, by way of example,
matters of a technical nature, such as scientific, trade and engineering
secrets, "know-how", formulae, secret processes or machines, inventions,
computer programs (including documentation of such programs) and research
projects, and matters of a business nature, such as proprietary information
about costs, profits, markets, sales, lists of customers, and other
information of a similar nature to the extent not available to the public,
and plans for future development.  After termination of this Agreement, the
Executive shall not use or disclose trade secrets or other confidential
information unless such information becomes a part of the public domain other
than through a breach of this Agreement or is disclosed to the Executive by a
third party who is entitled to receive and disclose such information.

                                     -3-

<PAGE>

     6.   Return of Documents and Property.  Upon the effective date of
notice of the Executive's or COMSAT's election to terminate this Agreement,
or at any time upon the request of COMSAT, the Executive (or his heirs or
personal representatives) shall deliver to COMSAT (a) all documents and
materials containing trade secrets or other confidential information relating
to COMSAT's business and affairs, and (b) all documents, materials and other
property belonging to COMSAT, which in either case are in the possession or
under the control of the Executive (or his heirs or personal
representatives).

     7.   Discoveries and Works.  All discoveries and works made or conceived
by the Executive during his employment by COMSAT, jointly or with others,
that relate to COMSAT's activities shall be owned by COMSAT.  The term
"discoveries and works" include, by way of example, inventions, computer
programs (including documentation of such programs), technical improvements,
processes, drawings and work of authorship.  The Executive shall (a) promptly
notify, make full disclosure to, and execute and deliver any documents
requested by, COMSAT to evidence or better assure title to such discoveries
and works in COMSAT, (b) assist COMSAT in obtaining or maintaining for itself
at its own expense United States and foreign patents, copyrights, trade
secret protection or other protection of any and all such discoveries and
works, and (c) promptly execute, whether during his employment or thereafter,
all applications or other endorsements necessary or appropriate to maintain
patents and other rights for COMSAT and to protect its title thereto.  Any
discoveries and works which, within six months after the termination of the
Executive's employment by COMSAT, are made, disclosed, reduced to a tangible
or written form or description, or are reduced to practice by the Executive
and which pertain to work performed by the Executive while with COMSAT and
RSI shall, as between the Executive and COMSAT, be presumed to have been made
during the Executive's employment by COMSAT.

     8.   Termination.  This Agreement shall remain in effect during
this Employment Term, and this Agreement and Executive's employment with
COMSAT may be terminated only as follows:

          (a)   By Executive at any time upon 60 day advance written notice
to COMSAT should COMSAT, without Executive's express written consent,
substantially reduce (except in connection with the termination of his
employment voluntarily by Executive or by COMSAT for "cause" as defined
below) his responsibilities as Vice President of the Division.  At the end of
the 60 day advance notice period, COMSAT shall pay Executive in a lump sum
(subject to withholding obligations as may be imposed by law) his then
current Base Salary for a period of one year.  In such event, COMSAT shall
continue to pay for the Executive's life, health and disability insurance
coverage through the remainder of the Employment Period hereunder to the extent

                                     -4-

<PAGE>

that RSI paid for such coverage under the RSI Employment Agreement.  All other
fringe benefits provided under this Agreement which have not vested shall cease
upon the effective date of termination, and COMSAT shall provide Executive such
health benefits as may be required under applicable COBRA law and regulation at
COMSAT's expense and without charge to Executive.

          (b)   For purposes of this Agreement, COMSAT shall have "cause" to
terminate the Executive's employment hereunder upon (i) the continued and
deliberate failure of the Executive to perform his duties, in a manner
substantially consistent with the manner prescribed by the President of
COMSAT or the President of the Division (other than any such failure
resulting from his incapacity due to physical or mental illness) which
failure continues for ten days following the Executive's receipt of written
notice from the President of COMSAT or the President of the Division
specifying the manner in which the Executive is in default of his duties,
(ii) the engaging by the Executive in serious misconduct that is materially
and demonstrably injurious to COMSAT, (iii) the conviction of the Executive
of commission of a felony involving a crime of moral turpitude, whether or
not such felony was committed in connection with COMSAT's business, or
(iv) the circumstances described in Section 9 hereof, in which case the
provision of Section 9 shall govern the rights and obligations of the
parties.

     9.   Disability; Death.
          -----------------

          (a)   If, prior to the expiration or termination of the Employment
Period, the Executive shall be unable to perform his duties by reason of
disability or impairment of health for at least six consecutive calendar
months, COMSAT shall have the right to terminate this Agreement by giving 60
days written notice to the Executive to that effect, but only if at the time
such notice is given such disability or impairment is still continuing.
Following the expiration of the notice period, the Employment Period shall
terminate with the payment of the Executive's Base Salary for the month in
which notice is given.  In the event of a dispute as to whether the Executive
is disabled within the meaning of this Section 9(a), or the duration of any
disability, either party may request a medical examination of the Executive
by a doctor appointed by the Chief of Staff of a hospital selected by mutual
agreement of the parties, or as the parties may otherwise agree, and the
written medical opinion of such doctor shall be conclusive and binding upon
the parties as to whether the Executive has become disabled and the date when
such disability arose.  The cost of any such medical examinations shall be
borne by COMSAT.

                                     -5-

<PAGE>


          (b)   If, prior to the expiration or termination of the Employment
Period, the Executive shall die, COMSAT shall pay to the Executive's estate
his Base Salary through the end of the month in which the Executive's death
occurred, at which time the Employment Period shall terminate without further
notice and COMSAT shall have no further obligations hereunder.

          (c)   Nothing contained in this Section 9 shall impair or otherwise
affect any rights and interests of the Executive under any compensation plan
or arrangement of COMSAT which may be adopted by the Board.

     10.  Non-Competition.
          ---------------

          (a)   Except as provided in paragraph (d) below, the Executive
agrees that for a period commencing as of the Effective Date and running
through the earlier of (i) the end of the Employment Period if the Executive
remains employed by COMSAT for the entire Employment Period or (ii) one year
following termination of the Executive's employment by COMSAT for any reason,
whether by action of the Executive or COMSAT (the "Non-Competition Period"),
the Executive will not, except as otherwise provided herein, engage or
participate, directly or indirectly, as principal, agent, employee, employer,
consultant, stockholder, partner or in any other individual capacity whatso-
ever, in the conduct or management of, or own any stock or any other equity
investment in or debt of, any business which is competitive with any business
conducted by the Division.

               For the purpose of this Agreement, a business shall be
considered to be competitive with the business of the Division only if such
business is engaged in providing services or products (i) similar to (x) any
service or product currently provided by the Division during the Employment
Period; (y) any service or product which evolves from or results from
enhancements in the ordinary course during the Non-Competition Period to the
services or products provided by the Division as of the date hereof or during
the Employment Period; or (z) any future service or product of the Division
as to which the Executive materially and substantially participated in the
design or enhancement, and (ii) to customers and clients of the type served
by the Division during the Non-Competition Period.

          (b)   Non-Solicitation of Employees.  During the Non-Competition
Period, the Executive will not (for his own benefit or for the benefit of any
person or entity other than COMSAT) solicit, or assist any person or entity
other than COMSAT to solicit, any officer, director, executive or employee of
COMSAT to leave his or her employment.

                                     -6-

<PAGE>

          (c)   Reasonableness.  The Executive acknowledges that (i) the
markets served by COMSAT are national and international and are not dependent
on the geographic location of the executive personnel or the businesses by
which they are employed, (ii) the length of the Non-Competition Period is
linked to the term of the Employment Period and the severance benefit provide
for in Section 8(a); and (iii) the above covenants are manifestly reasonable
on their face, and the parties expressly agree that such restrictions have
been designed to be reasonable and no greater than is required for the
protection of COMSAT.

          (d)   Investment.  Nothing in this Agreement shall be deemed to
prohibit the Executive from owning equity or debt investments in any
corporation, partnership or other entity which is competitive with COMSAT,
PROVIDED that such investments (i) are passive investments and constitute
five percent (5%) or less of the outstanding equity securities of such an
entity the equity securities of which are traded on a national securities
exchange or other public market, or (ii) are approved by the Board.

     11.  Enforcement.  The Executive agrees that COMSAT's remedies at law
for any breach or threat of breach by him of the provisions of Sections 5, 6,
7 and 10 hereof will be inadequate, and that COMSAT shall be entitled to an
injunction or injunctions to prevent breaches of the provisions of Sections
5, 6, 7 and 10 hereof and to enforce specifically the terms and provisions
thereof, in addition to any other remedy to which COMSAT may be entitled at
law or equity.

     12.  Arbitration
          -----------

          (a)   Subject to COMSAT's right to enforce Sections 5, 6, 7 and 10
hereof by an injunction issued by a court having jurisdiction (which right
shall prevail over and supersede the provisions of this Section 12), any
dispute relating to this Agreement, including the enforceability of this
Section 12, arising between the Executive and COMSAT or any of its affiliates
shall be settled by arbitration before a single arbitrator in accordance with
the commercial arbitration rules of the American Arbitration Association.

          (b)   The award of any such arbitrator shall be final.  Judgment
upon such award may be entered by the prevailing party in any federal or
state court sitting in Washington, D.C.

          (c)   The costs of arbitration proceedings, excluding attorneys
fees, shall be paid by the party that does not prevail in the arbitration
proceedings.

                                     -7-

<PAGE>

     13.  Severability.  Should any provision of this Agreement be
determined to be unenforceable or prohibited by any applicable law, such
provision shall be ineffective to the extent, and only to the extent, of such
unenforceability or prohibition without invalidating the balance of such
provision or any other provision of this Agreement, and any such
unenforceability or prohibition in any jurisdiction shall not invalidate or
render unenforceable such provision in any other jurisdiction.

     14.  Assignment.  The Executive's rights and obligations under this
Agreement shall not be assignable by the Executive.  COMSAT's rights and
obligations under this Agreement shall not be assignable by COMSAT except as
incident to the transfer, by merger or otherwise, of all or substantially all
of the business of the Division.  In the event of any assignment by COMSAT,
all rights of COMSAT hereunder shall inure to the benefit of the assignee.

     15.  Notices.  Any notice required or permitted under this Agreement
shall be deemed to have been effectively made or given if in writing and
personally delivered or mailed properly addressed in a sealed envelope,
postage prepaid by certified or registered mail.  Unless otherwise changed by
notice, notice shall be properly addressed to Executive if addressed to:

               William A. Thomas
               1431 Hagus Drive
               Leesburg, Virginia  22075

and properly addressed to COMSAT if addressed to:

               COMSAT Corporation
               6560 Rock Spring Drive
               Bethesda, Maryland  20817

               Attn:  Vice President, Human Resources
                        and Organization Development

     16.  Miscellaneous.  This Agreement constitutes the entire agreement,
and supersedes all prior agreements, of the parties hereto relating to the
subject matter hereof, and there are no written or oral terms or
representatives made by either party other than those contained herein.  The
validity, interpretation, performance and enforcement of the Agreement shall
be governed by the laws of the State of Maryland.  The headings contained
herein are for reference purposes only and shall not in any way affect the
meaning or interpretation of this Agreement.

                                     -8-

<PAGE>
      In WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and year first above written.

/s/ William A. Thomas
- ----------------------------
William A. Thomas, Executive
Including Attached Addendum
dated 30 January 1994

COMSAT CORPORATION

By:/s/ Bruce L. Crockett
   -----------------------------
   Bruce L. Crockett
   President and Chief Executive
     Officer


CTS AMERICA, INC.

By:/s/ Richard E. Thomas
   ---------------------
   Richard E. Thomas
   President

                                     -9-

<PAGE>

     In consideration of the employment agreement executed this 30th day of
January, 1994, by and among COMSAT Corporation, a District of Columbia
corporation ("COMSAT"), CTS America, Inc., a Delaware corporation and a wholly-
owned subsidiary of COMSAT ("CTS"), and the undersigned officer of Radiation
Systems, Inc. ("RSI") (the "Executive"), Executive hereby agrees to waive and
rescind all or such portions of the provisions of Section 7 of the amended
employment agreement between Executive and RSI as Deloitte & Touche or the
Securities and Exchange Commission determine would preclude the use of pooling
accounting in conjunction with the proposed merger of RSI with and into CTS.


                              /s/ William A. Thomas
                              -----------------------------------
                                         Executive



Dated:  January 30, 1994
        ----------------




<PAGE>

                                                                EXHIBIT 10(f)

                            EMPLOYMENT AGREEMENT
                            --------------------

     This AGREEMENT made as of the 30th day of January, 1994, by and among
COMSAT Corporation, a District of Columbia corporation ("COMSAT"), CTS
America, Inc., a Delaware corporation and a wholly owned subsidiary of COMSAT
("CTS"), and Anita M. Stutzman, a resident of the Commonwealth of Virginia
(the "Executive").

     WHEREAS, COMSAT and CTS have entered into an Agreement and Plan of
Merger (the "Merger Agreement"), dated as of January 30, 1994, among COMSAT,
CTS, and Radiation Systems, Inc., a Nevada corporation ("RSI"), pursuant to
which RSI will be merged with and into CTS (the "Merger"); and

     WHEREAS, the Executive currently serves as an officer of RSI;

     WHEREAS, the Executive is currently subject to an Employment Agreement,
as amended November 20, 1993, with RSI (the "RSI Employment Agreement"); and

     WHEREAS, COMSAT and CTS desire that the RSI Employment Agreement be
terminated at the time of consummation of the Merger; and

     WHEREAS, COMSAT desires to employ the Executive, and the Executive
desires to become an employee of COMSAT, on the terms and conditions set
forth herein;

     NOW, THEREFORE, in consideration of the premises and the mutual
agreements made herein, and intending to be legally bound hereby, COMSAT and
the Executive agree as follows:

     1.   Employment; Termination of RSI Employment Agreement; Duties.
          -----------------------------------------------------------

          (a)   Employment and Employment Period.  COMSAT shall employ the
Executive to serve as Vice President of the COMSAT RSI Division or subsidiary
or other successor operating entity within COMSAT (the "Division") for a
continuous period of three (3) years (the "Employment Period") commencing on
the "Effective Date" (as such term is defined in Section 1.2 of the Merger
Agreement).

          (b)   Termination of RSI Employment Agreement.  Effective on the
Effective Date, the RSI Employment Agreement shall be terminated and be of no
further force and effect.

          (c)   Offices, Duties and Responsibilities.  Effective on the
Effective Date, Executive shall be elected Vice President of the Division.
The Executive shall report to the President of the Division.  The Executive's
offices initially shall be located at RSI's present headquarters building in

<PAGE>

Sterling, Virginia, and shall during the Employment Period remain in the
Washington, D.C. metropolitan area.

          (d)   Devotion to Interests of COMSAT.  Except as expressly
authorized by the President of the Division, during the Employment Period the
Executive shall render his business services solely in the performance of his
duties hereunder.  The Executive shall use his best efforts to promote the
interests and welfare of COMSAT.

     2.  Compensation and Fringe Benefits.
         --------------------------------

          (a)   Base Compensation.  COMSAT shall pay the Executive a base
salary ("Base Salary") at the rate of (i) $(RSI current salary plus $10,000)
per year through the end of the Employment Period, with payments made in
installments in accordance with COMSAT's regular practice for compensating
executive personnel.  The Base Salary for the Executive shall be reviewed for
merit-based increases at least once each calendar year during the Employment
Period consistent with merit-based reviews for other COMSAT executives.  Such
reviews shall occur immediately prior to his "anniversary date" for
performance reviews at RSI.

          (b)   Bonus Compensation.  For each year or partial year ending on
December 31 during the Employment Period, the Executive shall be eligible to
receive annual bonuses (payable in January) under the COMSAT Annual Incentive
Plan ("AIP") based upon performance.  The standards applied for performance
reviews of the Executive under the AIP shall be consistent with the standards
applied for performance reviews of other COMSAT executives whose salaries are
in the comparable range of the then current Base Salary of the Executive
under this Agreement.  Any performance bonuses so paid to Executive shall be
subject to deferral at Executive's election under the AIP.

          (c)   Fringe Benefits.  The Executive also shall be entitled to
fringe benefits including participation in the Division's group life
insurance plan, the COMSAT 1990 Key Employee Stock Plan (the "Option Plan"),
the COMSAT Employee Stock Purchase Plan, the COMSAT Dividend Reinvestment
Plan, and health and disability insurance programs of the Division and
reimbursement of premiums for insurance coverage and reasonable expenses
incurred in connection with travel and entertainment related to COMSAT's
business and affairs.  The Executive also shall be entitled to use existing
balances of unused medical and legal reimbursement expense accounts with RSI
until depleted.

          (d)   Retention Bonuses.  The Executive shall be entitled to receive
retention bonuses so long as he remains employed by COMSAT on the date such
bonuses are payable as follows:

                                     -2-

<PAGE>

(i) 90 days after the Effective Date, a retention bonus of $16,000, (ii) on
the first anniversary of the Effective Date, a retention bonus of $17,300;
(iii) on the second anniversary of the Effective Date, a retention bonus of
$18,600; and (iv) on the third anniversary of the Effective Date, a retention
bonus of $20,200.

     3.   Stock Options.  On the Effective Date, COMSAT shall grant to the
Executive nonstatutory stock options (the "Options") under the Option Plan to
purchase 4,500 shares of COMSAT's common stock, without par value ("Common
Stock"), at a purchase price equal to the closing price of the Common Stock
on the New York Stock Exchange on the date of the execution and delivery of
the Merger Agreement, or if such date is not a date on which the Common Stock
has traded, the first trading date immediately prior to execution and
delivery of the Merger Agreement.  Such Options shall be represented by a
stock option agreement ("Option Agreement") in the form and containing the
terms customarily used by COMSAT for such agreements including terms relating
to the length of the Option term, vesting conditions and termination of
employment.

     4.   RSAs.  On the Effective Date, upon execution and delivery of this
Agreement, COMSAT shall grant the Executive 3,200 Restricted Stock Awards
(RSAs) under the Option Plan, which RSAs shall entitle Executive to receive
dividends (when and in the same amounts as dividends are paid on Common
Stock) as provided under the Option Plan.  The vesting of such RSAs shall be
subject to the satisfaction of objective performance standards to be adopted
by the Board and approved by COMSAT's shareholders.

     5.   Trade Secrets.  The Executive shall not (for his own benefit or the
benefit of any person or entity other than COMSAT) use or disclose any of
COMSAT's trade secrets or other confidential information.  The term "trade
secrets or other confidential information" includes, by way of example,
matters of a technical nature, such as scientific, trade and engineering
secrets, "know-how", formulae, secret processes or machines, inventions,
computer programs (including documentation of such programs) and research
projects, and matters of a business nature, such as proprietary information
about costs, profits, markets, sales, lists of customers, and other
information of a similar nature to the extent not available to the public,
and plans for future development.  After termination of this Agreement, the
Executive shall not use or disclose trade secrets or other confidential
information unless such information becomes a part of the public domain other
than through a breach of this Agreement or is disclosed to the Executive by a
third party who is entitled to receive and disclose such information.

                                     -3-

<PAGE>

     6.   Return of Documents and Property.  Upon the effective date of
notice of the Executive's or COMSAT's election to terminate this Agreement,
or at any time upon the request of COMSAT, the Executive (or his heirs or
personal representatives) shall deliver to COMSAT (a) all documents and
materials containing trade secrets or other confidential information relating
to COMSAT's business and affairs, and (b) all documents, materials and other
property belonging to COMSAT, which in either case are in the possession or
under the control of the Executive (or his heirs or personal
representatives).

     7.   Discoveries and Works.  All discoveries and works made or conceived
by the Executive during his employment by COMSAT, jointly or with others,
that relate to COMSAT's activities shall be owned by COMSAT.  The term
"discoveries and works" include, by way of example, inventions, computer
programs (including documentation of such programs), technical improvements,
processes, drawings and work of authorship.  The Executive shall (a) promptly
notify, make full disclosure to, and execute and deliver any documents
requested by, COMSAT to evidence or better assure title to such discoveries
and works in COMSAT, (b) assist COMSAT in obtaining or maintaining for itself
at its own expense United States and foreign patents, copyrights, trade
secret protection or other protection of any and all such discoveries and
works, and (c) promptly execute, whether during his employment or thereafter,
all applications or other endorsements necessary or appropriate to maintain
patents and other rights for COMSAT and to protect its title thereto.  Any
discoveries and works which, within six months after the termination of the
Executive's employment by COMSAT, are made, disclosed, reduced to a tangible
or written form or description, or are reduced to practice by the Executive
and which pertain to work performed by the Executive while with COMSAT and
RSI shall, as between the Executive and COMSAT, be presumed to have been made
during the Executive's employment by COMSAT.

     8.   Termination.  This Agreement shall remain in effect during
this Employment Term, and this Agreement and Executive's employment with
COMSAT may be terminated only as follows:

          (a)   By Executive at any time upon 60 day advance written notice to
COMSAT should COMSAT, without Executive's express written consent,
substantially reduce (except in connection with the termination of his
employment voluntarily by Executive or by COMSAT for "cause" as defined
below) his responsibilities as Vice President of the Division.  At the end of
the 60 day advance notice period, COMSAT shall pay Executive in a lump sum
(subject to withholding obligations as may be imposed by law) his then
current Base Salary for a period of one year.  In such event, COMSAT shall
continue to pay for the Executive's life, health and disability insurance
coverage through the remainder of the Employment Period hereunder to the extent

                                     -4-

<PAGE>

that RSI paid for such coverage under the RSI Employment Agreement.  All other
fringe benefits provided under this Agreement which have not vested shall cease
upon the effective date of termination, and COMSAT shall provide Executive such
health benefits as may be required under applicable COBRA law and regulation at
COMSAT's expense and without charge to Executive.

          (b)   For purposes of this Agreement, COMSAT shall have "cause" to
terminate the Executive's employment hereunder upon (i) the continued and
deliberate failure of the Executive to perform his duties, in a manner
substantially consistent with the manner prescribed by the President of
COMSAT or the President of the Division (other than any such failure
resulting from his incapacity due to physical or mental illness) which
failure continues for ten days following the Executive's receipt of written
notice from the President of COMSAT or the President of the Division
specifying the manner in which the Executive is in default of his duties,
(ii) the engaging by the Executive in serious misconduct that is materially
and demonstrably injurious to COMSAT, (iii) the conviction of the Executive
of commission of a felony involving a crime of moral turpitude, whether or
not such felony was committed in connection with COMSAT's business, or
(iv) the circumstances described in Section 9 hereof, in which case the
provision of Section 9 shall govern the rights and obligations of the
parties.

     9.   Disability; Death.
          -----------------

          (a)   If, prior to the expiration or termination of the Employment
Period, the Executive shall be unable to perform his duties by reason of
disability or impairment of health for at least six consecutive calendar
months, COMSAT shall have the right to terminate this Agreement by giving 60
days written notice to the Executive to that effect, but only if at the time
such notice is given such disability or impairment is still continuing.
Following the expiration of the notice period, the Employment Period shall
terminate with the payment of the Executive's Base Salary for the month in
which notice is given.  In the event of a dispute as to whether the Executive
is disabled within the meaning of this Section 9(a), or the duration of any
disability, either party may request a medical examination of the Executive
by a doctor appointed by the Chief of Staff of a hospital selected by mutual
agreement of the parties, or as the parties may otherwise agree, and the
written medical opinion of such doctor shall be conclusive and binding upon
the parties as to whether the Executive has become disabled and the date when
such disability arose.  The cost of any such medical examinations shall be
borne by COMSAT.

                                     -5-

<PAGE>

          (b)   If, prior to the expiration or termination of the Employment
Period, the Executive shall die, COMSAT shall pay to the Executive's estate
his Base Salary through the end of the month in which the Executive's death
occurred, at which time the Employment Period shall terminate without further
notice and COMSAT shall have no further obligations hereunder.

          (c)   Nothing contained in this Section 9 shall impair or otherwise
affect any rights and interests of the Executive under any compensation plan
or arrangement of COMSAT which may be adopted by the Board.

     10.  Non-Competition.
          ---------------

          (a)   Except as provided in paragraph (d) below, the Executive
agrees that for a period commencing as of the Effective Date and running
through the earlier of (i) the end of the Employment Period if the Executive
remains employed by COMSAT for the entire Employment Period or (ii) one year
following termination of the Executive's employment by COMSAT for any reason,
whether by action of the Executive or COMSAT (the "Non-Competition Period"),
the Executive will not, except as otherwise provided herein, engage or
participate, directly or indirectly, as principal, agent, employee, employer,
consultant, stockholder, partner or in any other individual capacity whatso-
ever, in the conduct or management of, or own any stock or any other equity
investment in or debt of, any business which is competitive with any business
conducted by the Division.

               For the purpose of this Agreement, a business shall be
considered to be competitive with the business of the Division only if such
business is engaged in providing services or products (i) similar to (x) any
service or product currently provided by the Division during the Employment
Period; (y) any service or product which evolves from or results from
enhancements in the ordinary course during the Non-Competition Period to the
services or products provided by the Division as of the date hereof or during
the Employment Period; or (z) any future service or product of the Division
as to which the Executive materially and substantially participated in the
design or enhancement, and (ii) to customers and clients of the type served
by the Division during the Non-Competition Period.

          (b)   Non-Solicitation of Employees.  During the Non-Competition
Period, the Executive will not (for his own benefit or for the benefit of any
person or entity other than COMSAT) solicit, or assist any person or entity
other than COMSAT to solicit, any officer, director, executive or employee of
COMSAT to leave his or her employment.

                                     -6-

<PAGE>

          (c)   Reasonableness.  The Executive acknowledges that (i) the
markets served by COMSAT are national and international and are not dependent
on the geographic location of the executive personnel or the businesses by
which they are employed, (ii) the length of the Non-Competition Period is
linked to the term of the Employment Period and the severance benefit provide
for in Section 8(a); and (iii) the above covenants are manifestly reasonable
on their face, and the parties expressly agree that such restrictions have
been designed to be reasonable and no greater than is required for the
protection of COMSAT.

          (d)   Investment.  Nothing in this Agreement shall be deemed to
prohibit the Executive from owning equity or debt investments in any
corporation, partnership or other entity which is competitive with COMSAT,
PROVIDED that such investments (i) are passive investments and constitute
five percent (5%) or less of the outstanding equity securities of such an
entity the equity securities of which are traded on a national securities
exchange or other public market, or (ii) are approved by the Board.

     11.  Enforcement.  The Executive agrees that COMSAT's remedies at law
for any breach or threat of breach by him of the provisions of Sections 5, 6,
7 and 10 hereof will be inadequate, and that COMSAT shall be entitled to an
injunction or injunctions to prevent breaches of the provisions of Sections
5, 6, 7 and 10 hereof and to enforce specifically the terms and provisions
thereof, in addition to any other remedy to which COMSAT may be entitled at
law or equity.

     12.  Arbitration
          -----------

          (a)   Subject to COMSAT's right to enforce Sections 5, 6, 7 and 10
hereof by an injunction issued by a court having jurisdiction (which right
shall prevail over and supersede the provisions of this Section 12), any
dispute relating to this Agreement, including the enforceability of this
Section 12, arising between the Executive and COMSAT or any of its affiliates
shall be settled by arbitration before a single arbitrator in accordance with
the commercial arbitration rules of the American Arbitration Association.

          (b)   The award of any such arbitrator shall be final.  Judgment
upon such award may be entered by the prevailing party in any federal or
state court sitting in Washington, D.C.

          (c)   The costs of arbitration proceedings, excluding attorneys
fees, shall be paid by the party that does not prevail in the arbitration
proceedings.

                                     -7-

<PAGE>

     13.  Severability.  Should any provision of this Agreement be
determined to be unenforceable or prohibited by any applicable law, such
provision shall be ineffective to the extent, and only to the extent, of such
unenforceability or prohibition without invalidating the balance of such
provision or any other provision of this Agreement, and any such
unenforceability or prohibition in any jurisdiction shall not invalidate or
render unenforceable such provision in any other jurisdiction.

     14.  Assignment.  The Executive's rights and obligations under this
Agreement shall not be assignable by the Executive.  COMSAT's rights and
obligations under this Agreement shall not be assignable by COMSAT except as
incident to the transfer, by merger or otherwise, of all or substantially all
of the business of the Division.  In the event of any assignment by COMSAT,
all rights of COMSAT hereunder shall inure to the benefit of the assignee.

     15.  Notices.  Any notice required or permitted under this Agreement
shall be deemed to have been effectively made or given if in writing and
personally delivered or mailed properly addressed in a sealed envelope,
postage prepaid by certified or registered mail.  Unless otherwise changed by
notice, notice shall be properly addressed to Executive if addressed to:

               Anita M. Stutzman
               1510 Scandia Circle
               Reston, Virginia  22090

and properly addressed to COMSAT if addressed to:

               COMSAT Corporation
               6560 Rock Spring Drive
               Bethesda, Maryland  20817

               Attn:  Vice President, Human Resources
                        and Organization Development

     16.  Miscellaneous.  This Agreement constitutes the entire agreement,
and supersedes all prior agreements, of the parties hereto relating to the
subject matter hereof, and there are no written or oral terms or
representatives made by either party other than those contained herein.  The
validity, interpretation, performance and enforcement of the Agreement shall
be governed by the laws of the State of Maryland.  The headings contained
herein are for reference purposes only and shall not in any way affect the
meaning or interpretation of this Agreement.

                                     -8-

<PAGE>
      In WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and year first above written.

/s/ Anita M. Stutzman
- ------------------------------
Anita M. Stutzman, Executive
Including the Addendum to this
Employment Agreement dated
30 January 1994

COMSAT CORPORATION

By:/s/ Bruce L. Crockett
- --------------------------------
   Bruce L. Crockett
   President and Chief Executive
     Officer


CTS AMERICA, INC.

By:/s/ Richard E. Thomas
- ------------------------
   Richard E. Thomas
   President

                                     -9-

<PAGE>

     In consideration of the employment agreement executed this 30th day of
January, 1994, by and among COMSAT Corporation, a District of Columbia
corporation ("COMSAT"), CTS America, Inc., a Delaware corporation and a wholly-
owned subsidiary of COMSAT ("CTS"), and the undersigned officer of Radiation
Systems, Inc. ("RSI") (the "Executive"), Executive hereby agrees to waive and
rescind all or such portions of the provisions of Section 7 of the amended
employment agreement between Executive and RSI as Deloitte & Touche or the
Securities and Exchange Commission determine would preclude the use of pooling
accounting in conjunction with the proposed merger of RSI with and into CTS.


                              /s/ Anita M. Stutzman
                              -----------------------------------
                                         Executive



Dated:  January 30, 1994
        ----------------




<PAGE>

                                                                   Exhibit 10(g)

                               COMSAT Corporation
                             6560 Rock Spring Drive
                               Bethesda, MD  20817
                             Telephone 301 214 3000
                                Fax 301 214 7100
                                  Telex 197800



                                January 30, 1994



Board of Directors
Radiation Systems, Inc.
1501 Moran Road
Sterling, Virginia  20166

Dear Sirs:

     In consideration of Radiation Systems, Inc. ("RSI") entering into an
Agreement and Plan of Merger, dated as of the date hereof (the "Merger
Agreement"), with COMSAT Corporation ("COMSAT") and CTS America, Inc. ("CTS")
which provides, among other things, that RSI will be merged into CTS upon the
terms and subject to the conditions thereof, COMSAT hereby agrees as follows
(all capitalized terms not otherwise defined herein shall have the definitions
ascribed thereto in the Merger Agreement):

     1.   If the Merger is consummated pursuant to the Merger Agreement, COMSAT
shall, or shall cause the Surviving Corporation to, indemnify to the fullest
extent provided in RSI's Articles of Incorporation and By-Laws as in effect on
the date hereof, the persons who are, at any time from and including the date
hereof through and including the Effective Date, the directors and officers of
RSI and the RSI ESOP trustees.

     2.   If the Merger is consummated pursuant to the Merger Agreement and
there is then or thereafter instituted or pending any action or proceeding
before any Federal, state or foreign court or governmental agency or other
regulatory or administrative agency or instrumentality challenging the Merger,
or otherwise seeking to restrain or prohibit consummation of the transactions
contemplated by the Merger Agreement, or seeking to impose any material
limitations on any provision of the Merger Agreement, then, in addition to the
indemnification described in paragraph 1, COMSAT shall promptly advance expenses
to the fullest extent permitted by Nevada law as if such mandatory advancement
were provided for in

<PAGE>

Board of Directors
January 30, 1994
Page 2

RSI's Articles of Incorporation except that COMSAT shall not require an
undertaking to repay such expenses as a condition to advancement.

     3.   COMSAT's obligation pursuant to paragraph 2 above shall terminate upon
the expiration of the relevant statute of limitations with respect to any claim
which could form the basis of an action or proceeding described in paragraph 2.

                              COMSAT CORPORATION




                              /s/ C. Thomas Faulders III
                              -----------------------------
                              By:
                              Its:  Chief Financial Officer

<PAGE>

                                                    Exhibit 10(h)

                               COMSAT Corporation
                             6560 Rock Spring Drive
                               Bethesda, MD  20817
                             Telephone 301 214 3000
                                Fax 301 214 7100
                                  Telex 197800



                                January 30, 1994



Board of Directors
Radiation Systems, Inc.
1501 Moran Road
Sterling, Virginia  20166

Dear Sirs:

     In consideration of Radiation Systems, Inc. ("RSI") entering into an
Agreement and Plan of Merger, dated as of the date hereof (the "Merger
Agreement"), with COMSAT Corporation ("COMSAT") and CTS America, Inc. ("CTS")
which provides, among other things, that RSI will be merged into CTS upon the
terms and subject to the conditions thereof, COMSAT hereby agrees as follows
(all capitalized terms not otherwise defined herein shall have the definitions
ascribed thereto in the Merger Agreement):

     1.   If the Merger is consummated pursuant to the Merger Agreement, COMSAT
shall, or shall cause the Surviving Corporation to, assume the sponsorship of
the Radiation Systems, Inc. Employee Stock Ownership Plan (the "ESOP") and
COMSAT shall cause COMSAT stock to be exchanged for the stock of RSI held by the
ESOP as provided under the Merger Agreement.  If the Merger is consummated
pursuant to the Merger Agreement, COMSAT shall, or shall cause the Surviving
Corporation to, make contributions to the ESOP in an amount sufficient to
amortize the existing ESOP loans in accordance with their terms or, in COMSAT's
discretion, more rapidly.  Following the Merger, participation in the ESOP may
not be extended to employees of COMSAT or its subsidiaries other than employees
of the Surviving Corporation.

     2.   If the Merger is consummated pursuant to the Merger Agreement, COMSAT
shall, or shall cause the Surviving Corporation to, indemnify to the fullest
extent permitted under applicable law, the ESOP trustees and all other
fiduciaries of any currently existing Plans maintained by RSI prior to the
Merger.  If the Merger

<PAGE>

Board of Directors
January 30, 1994
Page 2

is consummated pursuant to the Merger Agreement, COMSAT shall extend the
coverage of COMSAT's fiduciary liability insurance to the ESOP trustees
following the Merger.

     3.   If the Merger is consummated pursuant to the Merger Agreement, COMSAT
shall, or shall cause the Surviving Corporation to, maintain for at least one
year following the Effective Date of the Merger the group health coverage, group
life coverage and group disability coverage as provided to RSI employees prior
to the Merger and shall provide continuation coverage under COBRA under the
group health plan to any individual who was entitled to such coverage from RSI
immediately prior to the Merger.

     4.   If the Merger is consummated pursuant to the Merger Agreement, each
Director of RSI (other than Richard E. Thomas) will be considered to have left
the Board of RSI as of the Effective Date of the Merger and COMSAT shall, or
shall cause the Surviving Corporation to, enter into a contract with each of the
directors of RSI (other than Richard E. Thomas) to provide the benefits
specified in the "Board of Directors Retirement/Service Compensation" program of
RSI or the present value of such benefits determined using an interest rate not
to exceed eight percent (8%) per annum.

     COMSAT's obligations pursuant to this letter shall be binding on its
successors and assigns.

                              COMSAT CORPORATION




                              /s/ C. Thomas Faulders III
                              -----------------------------
                              By:
                              Its:  Chief Financial Officer

<PAGE>
                                                                   EXHIBIT 23(a)

                         INDEPENDENT AUDITORS' CONSENT

    We  consent to the incorporation by reference in this Registration Statement
of COMSAT  Corporation  on Form  S-4  of our  report  dated February  16,  1994,
appearing  in the  Annual Report  on Form  10-K, as  amended on  Form 10-K/A, of
COMSAT Corporation for the year ended December 31, 1993 and to the reference  to
us  under  the  heading "Experts"  in  the  Prospectus, which  is  part  of this
Registration Statement.

DELOITTE & TOUCHE

Washington, D.C.
May 2, 1994

<PAGE>
                                                                   EXHIBIT 23(b)

                         INDEPENDENT AUDITORS' CONSENT

    We  consent to the use in  this Registration Statement of COMSAT Corporation
on Form S-4 of our  report dated August 20,  1993, relating to the  consolidated
financial  statements  of  Radiation  Systems,  Inc.,  appearing  in  the  Proxy
Statement/Prospectus, which is part of  this Registration Statement, and to  the
incorporation  by reference in  this Registration Statement  of our report dated
August 20,  1993, appearing  in the  Annual  Report on  Form 10-K  of  Radiation
Systems,  Inc. for the year ended June 30, 1993 (as amended by Amendment Nos. 1,
2 and 3 thereto) and to the reference  to us under the heading "Experts" in  the
Proxy Statement/Prospectus, which is part of this Registration Statement.

DELOITTE & TOUCHE
Washington, D.C.

May 2, 1994

<PAGE>
                                                                   EXHIBIT 23(e)

                   CONSENT OF ALEX. BROWN & SONS INCORPORATED

    We  hereby consent to the inclusion of  our opinion letter dated January 30,
1994 to the Board of  Directors of Radiation Systems, Inc.  as Exhibit C to  the
Proxy  Statement-Prospectus which forms a part  of the Registration Statement on
Form S-4 relating  to the proposed  merger of Radiation  Systems, Inc. with  and
into  CTS America, Inc., a wholly-owned subsidiary of Comsat Corporation, and to
the references  to such  opinion in  such Proxy  Statement-Prospectus under  the
captions  "SUMMARY --  Opinion of  RSi's Financial  Advisor" and  "THE MERGER --
Background of the  Merger," "-- Recommendation  of the RSi  Board of  Directors;
RSi's  Reasons for the Merger"  and "-- Opinion of  RSi's Financial Advisor." In
giving such consent, we  do not admit  and we disclaim that  we come within  the
category  of persons whose consent is required under Section 7 of the Securities
Act of 1933, as amended, or the  rules and regulations issued by the  Securities
and Exchange Commission thereunder.

                                          Alex. Brown & Sons Incorporated

                                          By:        /s/ PATRICK J. KERINS

                                          --------------------------------------

Baltimore, Maryland

May 2, 1994

<PAGE>
                            RADIATION SYSTEMS, INC.
                   PROXY FOR SPECIAL MEETING OF STOCKHOLDERS
                                  JUNE 3, 1994

    The  undersigned hereby  appoints Richard E.  Thomas, Anita  M. Stutzman and
Harold Aryai Siegel, and each of them, with full power of substitution,  proxies
for  the undersigned  to represent  and to  vote all  shares of  common stock of
Radiation Systems, Inc. ("RSi") which the undersigned would be entitled to vote,
as fully as the  undersigned could vote  and act if  personally present, at  the
Special Meeting of Stockholders to be held on June 3, 1994, and all adjournments
thereof.  The proxies are authorized to vote  in their discretion upon all other
matters properly brought before the meeting.

           THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR THE PROPOSAL.

    For the approval and adoption of an  Agreement and Plan of Merger, dated  as
of  January 30, 1994, among RSi, COMSAT Corporation ("COMSAT"), and CTS America,
Inc., a wholly owned  subsidiary of COMSAT ("CTS  America"), pursuant to  which:
(a)  RSi will  merge into  CTS America,  and CTS  America will  be the surviving
corporation (the "Merger"), and (b) each share of common stock, par value  $1.00
per share, of RSi issued and outstanding immediately prior to the effective date
of  the Merger, other than shares held by  RSi, COMSAT or a subsidiary of RSi or
of COMSAT, shall be converted into that fraction (the "Conversion Fraction")  of
a fully paid and non-assessable share of the common stock, without par value, of
COMSAT  ("COMSAT Common  Stock") determined  by dividing  $18.25 by  the average
closing price  of  the  COMSAT Common  Stock  on  the New  York  Stock  Exchange
Composite  Tape during the 20 trading days ending five trading days prior to the
closing date of the Merger; PROVIDED, that the Conversion Fraction shall not  be
less  than .638 and shall not be greater  than .780, and that cash shall be paid
in lieu of fractional shares, all as described in the Proxy Statement/Prospectus
of RSi and COMSAT.

            / /  FOR            / /  AGAINST            / /  ABSTAIN

PLEASE SIGN ON THE REVERSE SIDE AND RETURN PROMPTLY IN THE ENCLOSED POSTAGE-PAID
                                   ENVELOPE.

                        (Continued on the Reverse Side)
<PAGE>
    The undersigned hereby acknowledges receipt of the Notice of Special Meeting
of Stockholders and the Proxy  Statement/Prospectus. Any proxy heretofore  given
to vote said common stock is hereby revoked. The undersigned hereby ratifies and
confirms  all that said proxies  or their substitutes may  lawfully do by virtue
hereof. THIS PROXY WHEN PROPERLY EXECUTED  WILL BE VOTED IN THE MANNER  DIRECTED
HEREIN  BY THE UNDERSIGNED STOCKHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL
BE VOTED FOR THE PROPOSAL.

                                             Please complete, date and sign your
                                             name(s) as it appear(s) to the left
                                             and   return   in   the    enclosed
                                             envelope. If acting as an executor,
                                             administrator,  trustee,  guardian,
                                             etc., you should  so indicate  when
                                             signing.   If   the  signer   is  a
                                             corporation, please  sign the  full
                                             corporate    name,   by    a   duly
                                             authorized officer.  If shares  are
                                             held   jointly,   each  stockholder
                                             named should sign.
                                             Date _______________________ , 1994
                                             Signature _________________________
                                             Signature _________________________

                                             THIS PROXY IS  SOLICITED ON  BEHALF
                                             OF   THE  BOARD   OF  DIRECTORS  OF
                                             RADIATION SYSTEMS, INC.

IMPORTANT-- Please sign, date  and return this Proxy  in the enclosed  envelope,
which requires no postage if mailed in the United States.



<PAGE>
                                                                   EXHIBIT 99(c)


To:  Participants in the Radiation Systems, Inc.
     Employee Stock Ownership Plan

               A Special Meeting of Stockholders of Radiation Systems, Inc.
("RSi") will be held at 10:00 a.m. on Friday, June 3, 1994 to consider and
vote upon a proposal to approve and adopt the merge agreement between RSi,
CTS America, Inc. ("CTS America"), and COMSAT Corporation ("COMSAT") providing
for the merger of RSi into a subsidiary of COMSAT (the "Merger").

               As a participant in the Radiation Systems, Inc. Employee Stock
Ownership Plan (the "ESOP"), you are entitled to instruct the Trustees of the
ESOP in the voting of the shares of common stock of RSi allocated to your
account under the ESOP.  You may instruct the Trustees to vote your shares "for"
the Merger or "against" the Merger or to abstain from voting your shares.  A
direction to abstain from voting will have the effect of directing the Trustees
to vote your shares against the Merger.

               An affirmative vote by the holders of a majority of the
outstanding shares of RSi common stock is necessary for the approval of the
merger agreement and the transactions contemplated thereby.

               Under the terms of the merger agreement RSi common stock
outstanding immediately prior to the effective date of the Merger (including the
881,072 shares held by the ESOP) will be converted into COMSAT common stock.
The amount of COMSAT stock that the ESOP will receive will be determined by
multiplying the number of RSi shares held by the ESOP by a fraction determined
by dividing $18.25 by the average closing price of COMSAT common stock on the
New York Stock Exchange during the 20 trading days ending five trading days
prior to the closing date of the Merger (the "Conversion Fraction").  The
Conversion Fraction, however, will not be less than .638 and will not be greater
than .780.  If the stockholders of RSi approve the transaction, RSi and COMSAT
intend to close the Merger on the day of the Special Meeting.

               Following the Merger, RSi will be combined with COMSAT's existing
systems integration business, COMSAT Technology Services, to form COMSAT RSI,
which will pursue opportunities in satellite and other wireless communications,
radar, scientific and related special application markets.

               COMSAT has agreed to (i) assume the sponsorship of the ESOP;
(ii) make contributions to the ESOP in an amount sufficient to continue to make
payments on the existing bank loans to the ESOP in accordance with their terms
or, in COMSAT's discretion, more rapidly; and (iii) limit participation in the
ESOP to persons who are employed by CTS America.

<PAGE>

               The enclosed Proxy Statement/Prospectus describes in greater
detail the transaction to be considered and voted upon.  Please give this
information your careful consideration and promptly complete, sign, date and
return the enclosed Directions to Trustees in the enclosed envelope.  TO BE
EFFECTIVE, YOUR DIRECTIONS TO TRUSTEES MUST BE RECEIVED BY WACHOVIA BANK OF
NORTH CAROLINA, N.A., AT THE ADDRESS BELOW BY THE CLOSE OF BUSINESS (5:00 P.M.
EDT) ON JUNE 2, 1994.  DIRECTIONS TO TRUSTEES RECEIVED AFTER THE CLOSE OF
BUSINESS ON JUNE 2, 1994, OR RECEIVED AT AN ADDRESS OTHER THAN THAT LISTED
BELOW, WILL NOT BE EFFECTIVE. Your directions, once given, may be revoked only
by completing and delivering new Directions to Trustees TO WACHOVIA BANK OF
NORTH CAROLINA, N.A. BY THE CLOSE OF BUSINESS (5:00 P.M. EDT), JUNE 2, 1994.
Your individual directions will not be disclosed to COMSAT, RSi or the ESOP
trustees and will be tabulated by Wachovia Bank of North Carolina, N.A.

                         By Regular Or Express Mail

                         Wachovia Corporate Trust
                         301 North Church, Second Floor
                         Winston-Salem, NC 27102
                         Attn:  Stock Transfer

               The enclosed Directions to Trustees applies only to the shares
allocated to your account under the ESOP.  If you own other RSi shares, please
follow the instructions in the Proxy Statement/Prospectus regarding voting of
those shares.

               THE TRUSTEES OF THE ESOP WILL VOTE THE SHARES ALLOCATED TO YOUR
ACCOUNT UNDER THE ESOP IN THE MANNER YOU DIRECT.  IF NO DIRECTION IS GIVEN, THE
TRUSTEES WILL VOTE THE SHARES ALLOCATED TO YOUR ACCOUNT IN A MANNER WHICH IS
PROPORTIONATE WITH THE VOTING OF THE ALLOCATED SHARES FOR WHICH DIRECTIONS HAVE
BEEN RECEIVED UNLESS, IN THE TRUSTEES' OPINION, SUCH ACTION WOULD BE
INCONSISTENT WITH THEIR FIDUCIARY DUTIES TO THE ESOP OR OTHERWISE INCONSISTENT
WITH APPLICABLE REGULATIONS.

                                        Sincerely,


                                        ----------------------------------
                                        Mark D. Funston, Trustee


                                        ----------------------------------
                                        George Reed, Trustee


                                        ----------------------------------
                                        Anita M. Stutzman, Trustee
Enclosures



                                       -2-
<PAGE>

                             RADIATION SYSTEMS, INC.
                          EMPLOYEE STOCK OWNERSHIP PLAN

                             DIRECTIONS TO TRUSTEES
                      REGARDING VOTING OF ALLOCATED SHARES
               IN CONNECTION WITH SPECIAL MEETING OF STOCKHOLDERS


               With respect to the shares of common stock of Radiation Systems,
Inc. ("RSi") allocated to my account under the Radiation Systems, Inc. Employee
Stock Ownership Plan (the "ESOP"), the Trustees of the ESOP are directed to vote
as instructed with respect to the proposal set forth below at the Special
Meeting of Stockholders of RSi on June 3, 1994, and to act in their discretion
upon all other matters properly brought before the Special Meeting.

               PROPOSAL TO BE VOTED UPON:  The approval and adoption of an
Agreement and Plan of Merger, dated as of January 30, 1994, among RSi, COMSAT
Corporation ("COMSAT"), and CTS America, Inc., a wholly-owned subsidiary of
COMSAT ("CTS America"), pursuant to which:  (a) RSi will merge into CTS America,
and CTS America will be the surviving corporation (the "Merger"), and (b) each
share of common stock, par value $1.00 per share, of RSi issued and outstanding
immediately prior to the effective date of the Merger, other than shares held by
RSi, COMSAT or a subsidiary of RSi or of COMSAT, shall be converted into that
fraction (the "Conversion Fraction") of a fully paid and non-assessable share of
the common stock, without par value, of COMSAT ("COMSAT Common Stock")
determined by dividing $18.25 by the average closing price of the COMSAT Common
Stock on the New York Stock Exchange Composite Tape during the 20 trading days
ending five trading days prior to the closing date of the Merger; provided,
that the Conversion Fraction shall not be less than .638 and shall not be
greater than .780, and that cash shall be paid in lieu of fractional shares,
all as described in the Proxy Statement/Prospectus of RSi and COMSAT.

               PLEASE VOTE THE SHARES OF RSI COMMON STOCK ALLOCATED TO MY
ACCOUNT UNDER THE ESOP AS FOLLOWS ON THE PROPOSAL:


                           ____                      ____            ____
          FOR THE MERGER  /___/  AGAINST THE MERGER /___/   ABSTAIN /___/
<PAGE>

               I HAVE RECEIVED THE NOTICE OF SPECIAL MEETING OF STOCKHOLDERS AND
THE PROXY STATEMENT/PROSPECTUS.

               ANY DIRECTION THAT I HAVE PREVIOUSLY GIVEN TO THE TRUSTEES
REGARDING THE VOTING OF THE SHARES ALLOCATED TO MY ACCOUNT UNDER THE ESOP IS
HEREBY REVOKED.

               WHEN THIS FORM IS PROPERLY SIGNED, THE TRUSTEES OF THE ESOP WILL
VOTE THE SHARES ALLOCATED TO YOUR ACCOUNT AS DIRECTED.  YOUR DIRECTIONS, ONCE
GIVEN, MAY BE REVOKED ONLY BY COMPLETING A NEW DIRECTION TO TRUSTEES AND
DELIVERING IT TO WACHOVIA BANK OF NORTH CAROLINA, N.A.  IF NO DIRECTION IS
GIVEN, THE TRUSTEES WILL VOTE THE SHARES ALLOCATED TO YOUR ACCOUNT IN A MANNER
THAT IS PROPORTIONATE WITH THE VOTING OF THE ALLOCATED SHARES FOR WHICH
DIRECTIONS HAVE BEEN RECEIVED UNLESS, IN THE TRUSTEES' OPINION, SUCH ACTION
WOULD BE INCONSISTENT WITH THEIR FIDUCIARY DUTIES TO THE RADIATION SYSTEMS, INC.
EMPLOYEE STOCK OWNERSHIP PLAN OR OTHERWISE INCONSISTENT WITH APPLICABLE
REGULATIONS.



                                        Date:                      , 1994
                                              ---------------------


                                        Signature
                                                  ------------------------
                                                  (Please sign exactly as
                                                  name appears to the left)



                                        PLEASE SIGN, DATE, AND RETURN THIS
                                        FORM IN THE ENCLOSED ENVELOPE, WHICH
                                        REQUIRES NO POSTAGE IF MAILED IN THE
                                        UNITED STATES.



                                       -2-


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