GRC INTERNATIONAL INC
POS AM, 1998-09-18
MANAGEMENT CONSULTING SERVICES
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  As filed with the Securities and Exchange Commission on September 18, 1998.

                                                     Registration No. 333-22147



                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549



                         POST-EFFECTIVE AMENDMENT NO. 2
                                   ON FORM S-3
                                   TO FORM S-2


                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933



                             GRC International, Inc.
              ----------------------------------------------------
             (Exact name of registrant as specified in its charter)


                                    Delaware
          ------------------------------------------------------------
         (State or other jurisdiction of incorporation or organization)


                                   95-2131929
                      -------------------------------------
                     (I.R.S. Employee Identification Number)


               1900 Gallows Road, Vienna, VA 22182 (703) 506-5000
           -----------------------------------------------------------
          (Address, including zip code, and telephone number, including
             area code, of registrant's principal executive offices)


<PAGE>


                                Thomas E. McCabe
              Senior Vice President, General Counsel and Secretary
                             GRC International, Inc.
                                1900 Gallows Road
                                 (703) 506-5000
             -------------------------------------------------------
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)


         Approximate  date of commencement of proposed sale to the public:  From
time to time after this Registration Statement becomes effective.

         If the only securities  being registered on this form are being offered
pursuant to dividend or interest  reinvestment plans, please check the following
box. ( )

         If any of the  securities  being  registered  on  this  Form  are to be
offered  on a  delayed  or  continuous  basis  pursuant  to Rule 415  under  the
Securities Act of 1933, check the following box. (x)

         If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering. ( ) 
                                                            -----

         If this  Form is a  post-effective  amendment  filed  pursuant  to Rule
462(c) under the Securities Act, check the following box and list the Securities
Act  registration   statement  number  of  the  earlier  effective  registration
statement for the same offering. ( ) 
                                    -----

         If delivery of the  prospectus  is expected to be made pursuant to Rule
434, please check the following box. ( )

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  THIS  REGISTRATION  STATEMENT  SHALL  BECOME
EFFECTIVE  ON SUCH  DATE  AS THE  SECURITIES  AND  EXCHANGE  COMMISSION,  ACTING
PURSUANT TO SAID SECTION 8(A), MAY DETERMINE.


<PAGE>



                                TABLE OF CONTENTS
<TABLE>
<CAPTION>



                                                                                                     Page
                                                                                                     ----
<S>                                                                                                   <C>
AVAILABLE INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                2

INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE . .                                                    3

RISK FACTORS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                4

THE COMPANY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                9

DESCRIPTION OF CAPITAL STOCK  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               10

DEBT AND EQUITY FINANCING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               10

USE OF PROCEEDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               13

SELLING STOCKHOLDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               14

PLAN OF DISTRIBUTION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               14

LEGAL MATTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               16

EXPERTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               16
</TABLE>



<PAGE>


                             SUBJECT TO COMPLETION,
                               SEPTEMBER 18, 1998

                                   PROSPECTUS

                                2,120,000 SHARES

                             GRC INTERNATIONAL, INC.

                                  COMMON STOCK

         This Prospectus originally covered the offering for resale from time to
time of up to 2,120,000  shares (the  "Shares") of common stock,  par value $.10
per  share  (the  "Common  Stock")  of  GRC  International,   Inc.,  a  Delaware
corporation  (the  "Company"),  by Halifax Fund, L.P., a Cayman Islands exempted
limited  partnership (the "Selling  Stockholder").  The Company was to issue the
Shares upon the conversion of all or any part of a debenture held by the Selling
Stockholder  (the  "Debenture") and the exercise of all or any part of a warrant
held by the Selling  Stockholder (the  "Warrant").  The Debenture has been fully
converted,  and the Selling  Stockholder has offered and sold all 804,332 Shares
that it received upon conversion of the Debenture.  This Prospectus, as amended,
relates to the offer and sale by the Selling  Stockholder of 320,000 Shares that
may be issued upon the exercise of the Warrant. See "DEBT AND EQUITY FINANCING."

         The  Company  will  receive no part of the  proceeds  of the sales made
hereunder,  but the Company did receive  proceeds from the sale of the Debenture
and will receive  proceeds upon the exercise of all or any part of the Warrant..
All expenses of  registration  incurred in connection  with this public offering
are being borne by the Company.

         The  Common  Stock is quoted  on the New York  Stock  Exchange  and the
Pacific Stock  Exchange  under the symbol "GRH." On September 14, 1998, the last
reported sale price of the Common Stock was $4 7/8.

         The Selling  Stockholder,  acting as  principal  for its own  accounts,
directly,  through  agents  designated  from time to time,  or through  brokers,
dealers, agents or underwriters also to be designated, may sell all or a portion
of the Shares that may be offered hereby in routine  brokerage  transactions  on
the New York Stock  Exchange,  the Pacific Stock Exchange or otherwise at prices
and terms  prevailing at the time of the sale. The Selling  Stockholder also may
make private  sales  directly or through  brokers or may make sales  pursuant to
Rule 144 of the Securities Act of 1933, as amended (the "Securities  Act") . The
Selling Stockholder may pay customary brokerage fees,  commissions and expenses.
The aggregate  proceeds to the Selling  Stockholder  from the sale of the Shares
that may be offered hereby by the Selling Stockholder will be the purchase price
of such shares less commissions, if any. The Company has agreed to indemnify the
Selling Stockholder against certain liabilities, including liabilities under the
Securities Act of 1933.  See "PLAN OF DISTRIBUTION."
<PAGE>

         The  Selling   Stockholder   and  any  brokers,   dealers,   agents  or
underwriters  that participate with the Selling  Stockholder in the distribution
of the  Shares  may be deemed  to be  underwriters  within  the  meaning  of the
Securities  Act,  in which  event  any  commissions  received  by such  brokers,
dealers,  agents or underwriters  and any profit on the resale of the Shares may
be deemed to be  underwriting  discounts  under the Securities Act. See "PLAN OF
DISTRIBUTION."

         PROSPECTIVE  INVESTORS SHOULD CAREFULLY  CONSIDER THE MATTERS DISCUSSED
UNDER "RISK FACTORS" BEGINNING ON PAGE 4.

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

         INFORMATION  CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT.  A
REGISTRATION  STATEMENT  RELATING  TO THESE  SECURITIES  HAS BEEN FILED WITH THE
SECURITIES  AND EXCHANGE  COMMISSION.  THESE  SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION  STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE  AN  OFFER  TO  SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN ANY STATE IN WHICH SUCH OFFER,  SOLICITATION  OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.

         NO DEALER,  SALESPERSON OR OTHER INDIVIDUAL HAS BEEN AUTHORIZED TO GIVE
ANY INFORMATION OR TO MAKE ANY REPRESENTATIONS  OTHER THAN THOSE CONTAINED IN OR
INCORPORATED  BY REFERENCE IN THIS  PROSPECTUS IN  CONNECTION  WITH THE OFFERING
MADE  BY  THIS  PROSPECTUS   AND,  IF  GIVEN  OR  MADE,   SUCH   INFORMATION  OR
REPRESENTATIONS  MUST  NOT BE  RELIED  UPON AS  HAVING  BEEN  AUTHORIZED  BY THE
COMPANY,  THE  SELLING  STOCKHOLDER  OR THEIR  RESPECTIVE  AGENTS.  NEITHER  THE
DELIVERY  OF THIS  PROSPECTUS  NOR ANY SALE  MADE  HEREUNDER  SHALL,  UNDER  ANY
CIRCUMSTANCES,  CREATE  AN  IMPLICATION  THAT  THERE  HAS BEEN NO  CHANGE IN THE
AFFAIRS OF THE COMPANY SINCE THE DATE AS OF WHICH  INFORMATION  IS GIVEN IN THIS
PROSPECTUS.  THIS  PROSPECTUS  DOES NOT CONSTITUTE AN OFFER OR  SOLICITATION  BY
ANYONE IN ANY JURISDICTION IN WHICH THE PERSON MAKING SUCH OFFER OR SOLICITATION
IS NOT  QUALIFIED  TO DO SO OR TO ANY PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH
SOLICITATION.

               The date of this Prospectus is September 18, 1998.


<PAGE>



                                                               
                              AVAILABLE INFORMATION


         The Company is subject to the information reporting requirements of the
Securities  Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  and in
accordance  therewith  files  periodic  reports,   proxy  statements  and  other
information with the Securities and Exchange Commission (the "Commission"). Such
reports,  proxy statements and other  information can be inspected and copied at
the public  reference  facilities  maintained  by the  Commission  at Room 1024,
Judiciary  Plaza,  450 Fifth Street,  N.W.,  Washington,  D.C. 20549, and at the
regional  offices of the  Commission  located at Seven World Trade Center,  13th
Floor, New York, New York 10048 and Northwestern Atrium Center, 500 West Madison
Street  (Suite 1400),  Chicago,  Illinois  60661.  Copies of all or part of such
materials  may also be obtained at  prescribed  rates from the public  reference
facilities maintained by the Commission at Room 1024, Judiciary Plaza, 450 Fifth
Street, N.W.,  Washington,  D.C. 20549. In addition,  the Commission maintains a
Web site at http://www.sec.gov that contains reports, proxy statements and other
information. Such materials also can be inspected at the offices of the New York
Stock Exchange,  20 Broad Street, New York, New York 10005 and the Pacific Stock
Exchange, 301 Pine Street, San Francisco, California 94104.

         The  Company has filed with the  Commission  a  registration  statement
(which  term  shall  encompass  any  amendments  thereto)  on Form S-3 under the
Securities Act with respect to the securities  offered hereby (the "Registration
Statement").  This  Prospectus,  which  constitutes  part  of  the  Registration
Statement, does not contain all of the information set forth in the Registration
Statement,  certain items of which are contained in exhibits to the Registration
Statement as  permitted  by the rules and  regulations  of the  Commission.  For
further  information  with respect to the Company and the securities  offered by
this Prospectus,  reference is made to the Registration Statement, including the
exhibits  thereto,  and the  financial  statements  and notes  thereto  filed or
incorporated by reference as a part thereof, which are on file at the offices of
the  Commission  and may be obtained  upon payment of the fee  prescribed by the
Commission,  or may be examined without charge at the offices of the Commission.
The  Registration  Statement and the exhibits  thereto filed by the Company with
the Commission may be inspected and copied at the locations described above.



<PAGE>


                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE


         The  following  documents  filed by the  Company  with  the  Commission
pursuant to the  Exchange  Act  (Commission  File No.  1-7517) are  incorporated
herein by reference:

              (a) the  Company's  annual report on Form 10-K for the fiscal year
ended June 30, 1998,

              (b) the Company's current report on Form 8-K dated August 7, 1998,
and

              (c) the  description of the Company's  capital stock  contained in
the Company's  registration  statement pursuant to Section 12(g) of the Exchange
Act on Form 8-A, filed on August 19, 1981 and amended on February 6, 1992.

         All documents filed by the Company pursuant to Section 13(a), 13(c), 14
or 15(d) of the Exchange Act subsequent to the date of this Prospectus and prior
to the filing of a  post-effective  amendment that indicates the  termination of
this offering shall be deemed to be incorporated in this Prospectus by reference
and to be a part hereof from the date of filing of such documents.

         Any statements contained herein or in a document incorporated or deemed
to be  incorporated  by  reference  herein  shall be  deemed to be  modified  or
superseded  for  purposes  of this  Prospectus  to the extent  that a  statement
contained herein or in any other subsequently filed document which also is or is
deemed to be  incorporated  by  reference  herein  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 Prospectus.

         The Company will  provide,  without  charge to each person to whom this
Prospectus has been delivered, a copy of any or all of the documents referred to
above  that have been or may be  incorporated  by  reference  herein  other than
exhibits to such documents  (unless such exhibits are specifically  incorporated
by  reference  therein).  Requests  for such  copies  should be  directed to GRC
International,  Inc., 1900 Gallows Road, Vienna, VA 22182, Attention:  Thomas E.
McCabe, Senior Vice President, General Counsel and Secretary. Telephone requests
may be directed to (703) 506-5000.



<PAGE>


THIS PROSPECTUS  CONTAINS AND INCORPORATES BY REFERENCE  CERTAIN FORWARD LOOKING
STATEMENTS WITHIN THE MEANING OF THE PRIVATE SECURITIES LITIGATION REFORM ACT OF
1995 WITH RESPECT TO THE FINANCIAL CONDITION, RESULTS OF OPERATIONS AND BUSINESS
OF THE COMPANY,  INCLUDING,  WITHOUT  LIMITATION,  STATEMENTS  HEREIN UNDER "THE
COMPANY" AND "RISK FACTORS" AND STATEMENTS IN THE COMPANY'S ANNUAL AND QUARTERLY
REPORTS UNDER  "MANAGEMENT'S  DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
RESULTS OF OPERATIONS."  THESE FORWARD LOOKING  STATEMENTS INVOLVE CERTAIN RISKS
AND  UNCERTAINTIES.  NO ASSURANCE  CAN BE GIVEN THAT ANY OF SUCH MATTERS WILL BE
REALIZED.  FACTORS THAT MAY CAUSE ACTUAL RESULTS TO DIFFER MATERIALLY FROM THOSE
CONTEMPLATED  BY SUCH FORWARD  LOOKING  STATEMENTS  INCLUDE,  AMONG OTHERS,  THE
FACTORS DISCUSSED HEREIN UNDER "RISK FACTORS."


                                  RISK FACTORS

         In addition to the other information in this Prospectus,  the following
factors should be considered carefully by prospective investors in evaluating an
investment in the shares of Common Stock offered in this Prospectus.

HIGH DEBT LEVEL

         As of June 30, 1998, the Company had  outstanding  total long-term debt
of $24.3 million, of which $975,000 was classified as current,  including a $4.8
million  term loan (the "Term  Loan"),  $18.5  million  drawn from a $22 million
revolving  line of credit (the  "Revolving  Credit"),  and a $961,000  equipment
lease  financing  (the  "Equipment  Lease").  The  Term  Loan  will  come due on
September 1, 2000 unless extended, while the Revolving Credit extends to January
2000,  with the bank  required  to provide  15 months  prior  written  notice to
terminate (absent any defaults under the credit agreement).  The Equipment Lease
is expected to be fully retired by the end of fiscal 1999.

         The  current  level and terms of  indebtedness:  (i) will  require  the
Company to dedicate a  significant  portion of its  available  net earnings from
operations to payment of interest and principal on the indebtedness;  (ii) could
limit the Company's flexibility in reacting to business developments and changes
in industry and economic conditions  generally;  (iii) could limit the Company's
ability  to obtain  additional  financing  in the future  for  working  capital,
capital  expenditures,  research  and  development,   acquisitions  and  general
corporate  purposes;   and  (iv)  could  place  the  Company  at  a  competitive
disadvantage inasmuch as many of its competitors are not comparably indebted.

         The Company  anticipates  reducing its indebtedness with cash flow from
operations.  Any growth in operations,  however, could actually reduce cash flow
in the short  term  because of the time lag  between  when the  Company  renders
services  and  whe

<PAGE>

the Company's  principal  customer,  DoD, pays for those services.  Furthermore,
there can be no assurance of continued growth in the Company's  business,  which
is subject to additional risks. See "-- Dependence on Significant Customer," "--
Dependence on Significant  Contracts," "--Contract Profit Exposure," "--Audits,"
"--  Potential  Suspension  and  Debarment,"  "--Rapid   Technological  Change,"
"-Competition" and "-- Dependence on Professional Staff and Key Personnel."

         The  Company  also may be able to reduce  its  indebtedness  by raising
additional capital through the Structured Equity Line. Conditions to the sale of
Common  Stock  under  the   Structured   Equity  Line   include  (i)   continued
effectiveness  of a  registration  statement  under the  Securities  Act for the
resale by CCS of the shares of Common Stock to be sold to CCS,  (ii) CCS and its
affiliates not beneficially owning more than 4.9% of the Company's Common Stock,
(iii)  listing of the  Company's  Common Stock on the NYSE or AMEX or trading of
the  Company's  Common  Stock on the NASDAQ NMS and (iv) the price of the Common
Stock  being at least $4.00 per share,  the value of open market  trading of the
Common  Stock being at least  $500,000  per day,  and the amount of Common Stock
sold to CCS in any three month  period not  exceeding  8% of the  average  daily
value  of open  market  trading  of the  Common  Stock on its  principal  market
multiplied by the number of trading days in that period.  Based on recent prices
and trading  volume for the Common Stock,  there is a substantial  risk that the
Company may not be able to sell as much as $3 million in Common  Stock to CCS in
each three month period,  and there is a risk that in at least some quarters the
Company  may not be able to sell any  Common  Stock  at all.  In  addition,  the
Company's ability to raise capital through the Structured Equity Line is subject
to the performance of CCS under the Structured  Equity Line, and  nonperformance
by CCS would  leave the Company  unable to raise  capital  under the  Structured
Equity Line. See "DEBT AND EQUITY FINANCING."

STOCK PRICE VOLATILITY; SHARES ELIGIBLE FOR FUTURE SALE

         The price of the  Company's  Common  Stock has been  volatile.  For the
twelve  months ended  September  14, 1998,  the price of the Common Stock ranged
from $11 3/8 to $4 11/16,  and closed at $4 7/8.  The price of the Common  Stock
could be subject to additional  significant  fluctuations  in response to, among
other things, variations in the Company's operating results, introduction of new
services or  technologies  by the Company or its  competitors,  changes in other
conditions or trends in the Company's industries,  changes in security analysts'
estimates  of  the  Company's  or  its   competitors'   or  industries'   future
performance,  general  market  conditions  and the described  herein under "RISK
FACTORS."  General market price declines or market  volatility in the future, or
future  declines  or  volatility  in the  prices of stock for  companies  in the
Company's industries, also could affect the price of the Common Stock.

         The Company's  agreements with the Selling Stockholder and CCS also may
have an effect on the price of the Company's  Common  Stock.  Under the terms of
the Warrant, the Company has agreed to allow the Selling Stockholder to purchase
320,000  shares  of  Common  Stock at a price  of $8.47  per  share.  Under  the
Company's agreements with CCS, the Company may issue up to $18,000,000 of Common
Stock CCS at a price  that is

<PAGE>

equal to 94% of the lowest reported sale price during the three days immediately
preceding the notice of purchase to the Selling Stockholder.  In connection with
the Company's  agreement  with CCS, the Company has issued  warrants to purchase
125,000  shares  of Common  Stock at $8.47 per share and may issue a warrant  to
purchase  75,000 shares at 140% of a future  market price.  See "DEBT AND EQUITY
FINANCING" and "SELLING  STOCKHOLDER." The resale by the Selling Stockholder and
CCS of the  Company's  Common Stock that they acquire  could  depress the market
price of the Company's Common Stock.

         Moreover,  the terms of the  Structured  Equity Line  provide  that the
Company  has the right to require CCS to purchase up to $3 million of the Common
Stock in any of the three  month  periods  during  its term,  subject to certain
limitations.  Although the terms of the Structured  Equity Line provide that CCS
and its affiliates  are not required to purchase  Common Stock in an amount such
that they would beneficially own more than 4.9% of the Common Stock outstanding,
CCS also has covenanted  and agreed to use its  reasonable  best efforts to sell
shares  of Common  Stock to the  extent  required  so that CCS can  continue  to
purchase Common Stock notwithstanding this limitation.  Accordingly,  CCS may be
required  to  purchase  Common  Stock from the  Company  in a manner  that would
require it, in order to stay under the 4.9% beneficial  ownership limitation and
comply with its obligations to the Company, to sell shares without regard to any
adverse  effects on price and other market  factors  associated  with the Common
Stock. See "DEBT AND EQUITY FINANCING" and "SELLING STOCKHOLDER."

DEPENDENCE ON GOVERNMENT CONTRACTS

         The Company  derives  substantially  all of its  business  from service
contracts and subcontracts with DoD and its instrumentalities.  Typically,  such
contracts  have an initial  term of one year  combined  with two,  three or four
one-year renewal periods exercisable at the government's discretion. DoD and its
instrumentalities  are not  obligated to exercise  the options to renew.  At the
time of completion,  a contract in its entirety may be "recompeted"  against all
interested  third-party  providers,   and  awards  are  subject  to  protest  by
disappointed  bidders.  Federal law  permits DoD to  terminate a contract at any
time if such  termination is deemed to be in DoD's best interest.  DoD's failure
to renew, or termination of any significant  portion of, the Company's contracts
could have an adverse effect on the Company.

         Continuation  and  renewal  of  existing  contracts  with the DoD,  and
acquisition of additional  contracts from DoD, is contingent  upon,  among other
things,  the  availability  of funding  for DoD.  The  current  world  political
situation and domestic  political  pressure to reduce the federal budget deficit
have  reduced,  and may continue to reduce,  DoD's  budget,  which could have an
adverse effect on the Company's earnings.

         The adoption of new or modified procurement regulations also could have
an adverse  effect on the Company and its cost of competing  for and  performing
government contracts.
<PAGE>

DEPENDENCE ON SIGNIFICANT CONTRACTS

         Although  professional services contracts at fiscal year-end 1998, 1997
and 1996 have numbered 156, 144 and 149,  respectively,  the loss of one or more
contracts may have a substantial  adverse  impact on the Company's  revenues and
profitability if the particular contract is large in relation to the rest. There
also can be no assurance that the Company will win any follow-on contracts.

CONTRACT PROFIT EXPOSURE

         The Company provides services to the government  through three types of
contracts: fixed-price,  time-and-materials and cost-reimbursement.  The Company
assumes  financial  risk  on  fixed-price  contracts  (approximately  5% of  the
Company's  government  contract  revenues  in fiscal  year  1998) and  time-and-
material  contracts  (approximately  46% of the  Company's  government  contract
revenues in fiscal year 1998) because the Company assumes the risk of performing
those contracts at the stipulated prices or negotiated hourly rates. The failure
to estimate ultimate costs accurately or to control costs during  performance of
the work could result in losses or smaller than anticipated profits. The balance
of the Company's  government contract revenue in fiscal year 1998 (approximately
49%) was  derived  from  cost-reimbursement  contracts.  To the extent  that the
actual costs incurred in performing a cost-reimbursement contract are within the
contract  ceiling and allowable  under the terms of the contract and  applicable
regulations,  the  Company  is  entitled  to  reimbursement  of its costs plus a
stipulated profit. However, if the Company's costs exceed the ceiling or are not
allowable under the terms of the contract or applicable regulations,  any excess
would be subject to adjustment and repayment upon audit by the government.

AUDITS

         Government  contract  payments  received by the  Company for  allowable
direct and indirect costs are subject to adjustment and repayment after audit if
the payments exceed  allowable  costs as defined in such  government  contracts.
Audits  have been  completed  and final  adjustments  agreed upon for all of the
Company's  incurred  contract costs through the end of fiscal year 1988.  Audits
have been completed on certain other incurred  contract costs through the end of
fiscal year 1991.  Additional audits are either completed (in some cases through
fiscal  year 1995) or in progress  for fiscal  years  subsequent  to fiscal year
1991.

POTENTIAL SUSPENSION AND DEBARMENT

         The Company is subject to federal  regulations under which its right to
receive  future awards of new  government  contracts,  or extensions of existing
government contracts, may be unilaterally suspended or barred should the Company
be  convicted  of a crime or be indicted  based on  allegations  of violation of
certain  specific  federal statutes or other  activities.  Suspensions,  even if
temporary,  can  result in the loss of  valuable  contract  awards for which the
Company  otherwise would be eligible.  The initiation of

<PAGE>

suspension  or  debarment  hearings  against the  Company  could have an adverse
effect on the Company.

YEAR 2000 RISKS

         Many currently  installed  computer systems will not properly recognize
date  sensitive  information  when the year  changes  to  2000,  and thus  could
generate  erroneous  data or even fail.  The  Company has formed a task force to
minimize  the  disruptions  to its  business  that could  result  from year 2000
problems  and to  minimize  other  liabilities  it  might  incur  in  connection
therewith.  The Company also has  initiated  communications  with third  parties
whose  computer  systems'  functionality  could affect the Company.  While these
efforts are still  ongoing,  and no final  assessment of the Company's year 2000
issues has been made, the Company  currently does not expect these costs to have
a material adverse effect on the Company's overall results of operations or cash
flows.  There can be no  assurance,  however,  that the Company  will be able to
resolve all year 2000 issues in a timely  fashion or that the  ultimate  cost to
identify and implement  solutions to all year 2000 problems will not be material
to the Company.

TECHNOLOGICAL CHANGE AND PROPRIETARY INFORMATION

         The Company's business is dependent on its technical and organizational
knowledge,  practices and procedures,  and its future success is based, in part,
on its  ability  to keep up to date  with new  technological  breakthroughs  and
incorporate such changes in its products and services. There can be no assurance
that the Company will be  successful  in  developing  and  marketing in a timely
manner new  products  and services  that  respond to  technological  advances by
others,  or that  the  Company's  products  and  services  will  adequately  and
competitively address the needs of the changing marketplace.

COMPETITION

         The markets that the Company services are highly competitive and likely
to become more so with the expected  continuing  decline of  government  defense
expenditures.  Some of the Company's  competitors are large,  diversified  firms
with  substantially  greater financial  resources,  lower debt levels and larger
technical staffs than the Company has available to it. Government  agencies also
compete with the Company  because they can utilize their  internal  resources to
perform certain types of services that the Company might otherwise perform.

DEPENDENCE ON PROFESSIONAL STAFF

         To service  its  contracts,  the  Company  must  recruit and retain key
technical  personnel,  such  as  operations  research  and  software  engineers,
computer  programmers,  and other skilled scientists and engineers.  Competition
for such personnel is intense, and the Company often must comply with provisions
in government contracts that require employment of persons with specified levels
of education,  work  experience and security  clearances.  At June 30, 1998, the
Company had openings for approximately 175

<PAGE>

professional  services positions.  An inability to fill a substantial portion of
these current  openings  could have an adverse  impact on the Company's  revenue
growth and profitability.

POTENTIAL ISSUANCE OF PREFERRED STOCK

         The Company's Board of Directors has the authority, without any further
vote by the Company's  stockholders,  to issue up to 300,000 shares of Preferred
Stock  in  one or  more  series  and  to  determine  the  designations,  powers,
preferences  and  relative,  participating,  optional or other  rights  thereof,
including  without  limitation,  the dividend  rate (and whether  dividends  are
cumulative),  conversion rights,  voting rights, rights and terms of redemption,
redemption price and liquidation preference. Although the Company has no current
plans to issue any  shares of  Preferred  Stock,  the  rights of the  holders of
Common Stock would be subject to, and may be  adversely  affected by, the rights
of the holders of any Preferred Stock that may be issued in the future. Issuance
of Preferred Stock could have the effect of delaying,  deterring or preventing a
change in control of the Company, including the imposition of various procedural
and other  requirements  that could make it more difficult for holders of Common
Stock to effect  certain  corporate  actions,  including  the ability to replace
incumbent  directors  and to  accomplish  transactions  opposed by the incumbent
Board of Directors.


                                   THE COMPANY

         The  Company  provides   knowledge-based   professional   services  and
high-quality  technology-based  product  solutions to government  and commercial
customers.  The  Company  was  organized  in  California  in 1961 and has been a
Delaware  corporation since 1974. The Company's  principal executive offices are
located at 1900 Gallows Road,  Vienna,  Virginia 22182, and its telephone number
is (703) 506-5000.  For further information about the business and operations of
the Company,  reference is made to the Company's reports  incorporated herein by
reference. See "INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE."


                          DESCRIPTION OF CAPITAL STOCK

         The Company's authorized capital stock consists of 30,000,000 shares of
Common  Stock,  $.10 par value per share,  and  300,000  shares of  undesignated
Preferred  Stock,  $1.00 par value per share.  As of July 31,  1998,  10,213,482
shares of Common Stock were issued and  outstanding,  and no shares of Preferred
Stock were  designated or issued.  For further  information  about the Company's
capital stock, reference is made to the Company's reports incorporated herein by
reference. See "DESCRIPTION OF CAPITAL STOCK."
<PAGE>


                            DEBT AND EQUITY FINANCING

         The  Company  entered  into  financing   agreements  with  the  Selling
Stockholder  and CCS in  January  1997 in order to raise  additional  capital to
continue its operations. The Company sought to raise additional capital because,
since 1993, the Company had invested its free cash flow and incurred substantial
debt to finance the development of products for its telecommunications  business
units but had not  realized  the  revenues  that it had  anticipated  from these
business  units.  Before  entering  into the financing  agreements,  the Company
sought  the  advice of a  financial  advisor  with  respect  to a full  range of
financial and strategic options.  In particular,  the advisor,  on the Company's
behalf, sought strategic partnerships, distributorship, licensing agreements and
other  transactions.  Among  the  goals  of any such  transaction  was to find a
corporate partner that could provide additional capital and financial  resources
to assist the Company in continuing to develop its  telecommunications  business
units. By January 1997, these efforts had not been  successful,  and the Company
believed that obtaining near-term  commitments for additional capital was in its
best interest.  The Company also  considered,  as  alternatives to the financing
agreements, other debt and equity financings, but concluded that such financings
were not  likely to be  available  within an  acceptable  time  frame  and/or on
acceptable  terms.  Thus,  the  financing  agreements  provided what the Company
believed were terms for additional capital in the needed time frame that were in
the best interest of the Company.

CONVERTIBLE DEBENTURE

         The  Company  entered  into  a  Convertible   Securities   Subscription
Agreement, dated as of January 21, 1997 (the "Subscription Agreement"), with the
Selling  Stockholder.  The investment manager for the Selling Stockholder is The
Palladin  Group,  L.P.,  which is the  managing  member of CCS.  Pursuant to the
Subscription Agreement, the Selling Stockholder purchased a $4 million aggregate
principal   amount  5%   Convertible   Debenture   due  January  30,  2000  (the
"Debenture"). The Debenture was convertible, at the Selling Stockholder's option
60 days  after  January  30,  1997 at any time and from  time to time,  into the
Company's Common Stock at the lesser of (i) $11 per share, subject to adjustment
under  certain  circumstances,  or (ii) 94% of the  lowest  reported  sale price
during the three trading days immediately preceding the date of conversion.  The
Debenture has been fully  converted into 804,322 shares of the Company's  Common
Stock.

         As  consideration  for entering into the  Subscription  Agreement,  the
Company issued to the Selling Stockholder a seven year warrant,  which,  subject
to certain  exceptions,  was not  exercisable  until July 30, 1998,  to purchase
320,000 shares of the Company's  Common Stock at a price of $8.47 per share (the
"Warrant").  If the  Company (i) sells all or  substantially  all of its assets,
(ii)  enters  into a  merger,  consolidation,  reorganization  or other  similar
transaction  that  results  in the  shareholders  of the  Company  owning in the
aggregate  less than 50% of the common  equity  and having  less than 50% of the
voting  power of the  surviving  entity,  or (iii)  fixes a record  date for the
declaration of a material  special  distribution  or dividend,  then the Warrant
becomes immediately 

<PAGE>

exercisable at a price equal to the lesser of (i) $8.47 per share or (ii) 80% of
the "Transaction Value" per share. "Transaction Value" is defined in the Warrant
to mean, in the case of a merger,  acquisition,  sale of Common  Stock,  sale of
assets or similar transaction,  the fair market value of the consideration to be
received per share of Common  Stock,  as evidenced by the average of the closing
sale  price for the  Common  Stock  during the 10  trading  days  following  the
announcement of such definitive agreement, and in the case of a material special
dividend  or   distribution,   the  fair  market  value  of  such   dividend  or
distribution.

STRUCTURED EQUITY LINE

         The Company  and CCS entered  into a  Structured  Equity Line  Flexible
Financing Agreement, dated as of January 21, 1997 and amended and restated as of
August 26,  1998 (the  "Structured  Equity  Line"),  and a related  Registration
Rights  Agreement,  dated as of  January  30,  1997  (the  "Registration  Rights
Agreement").

         Pursuant to the terms of the Structured Equity Line, as amended, CCS is
required to purchase  shares of Common Stock over a period of 36 months (subject
to adjustment  upon the  occurrence of certain  events)  beginning on October 1,
1998,  for an aggregate  purchase  price of up to $18  million.  The Company may
terminate the Structured Equity Line on April 1, 1999, provided that CCS has, as
of such date,  purchased shares of Common Stock for an aggregate  purchase price
of at least $5 million. If the Company issues less than $5 million of its Common
Stock under the Structured Equity Line, it must pay CCS up to $300,000.

         Under the terms of the Structured  Equity Line, during each three month
period,  the Company,  subject to the  satisfaction of certain  conditions,  can
require CCS to purchase  shares of Common Stock for an aggregate  purchase price
of at  least  $1.5  million  and up to $3  million.  At the  beginning  of  each
three-month  period,  the  Company is  required  to notify CCS of the  aggregate
purchase  price of shares of Common Stock,  if any,  required to be purchased by
CCS during such  three-month  period.  CCS will select and notify the Company of
the date on which the purchase of shares of Common Stock from the Company  shall
close within each such three-month period following notification by the Company,
and of the purchase of  additional  shares of Common Stock during such period if
the  aggregate  purchase  price of the  shares  of Common  Stock to be  acquired
pursuant to the  Company's  notification  is less than $3 million.  The purchase
price per share to be paid by CCS for shares  Common  Stock  acquired  under the
Structured  Equity Line is equal to 94% of the lowest reported sale price during
the three trading days immediately preceding the notice of purchase by CCS.

         CCS's   obligation  to  purchase  shares  of  Common  Stock  under  the
Structured  Equity  Line is subject to various  conditions,  including,  without
limitation: (i) effectiveness of the Registration Statement under the Securities
Act with  respect to the  Shares;  (ii) the price of the Common  Stock  being at
least $4.00 per share;  (iii) reported trading volume of the Common Stock in its
principal  trading market  multiplied by the weighted  average trading price (by
trading  volume) of the Common Stock ("the value of

<PAGE>

open  market  trading")  being  during a period of 20 trading  days prior to the
commencement  of each  three-month  period of at least  $500,000  per day in any
three month  period in which the  Company  requires  CCS to  purchase  shares of
Common Stock for an aggregate purchase price in excess of $1.5 million; (iv) the
lesser of the amount of Common  Stock sold to CCS in any three month  period not
exceeding  8% of the average  daily  value of open market  trading of the Common
Stock on its principal  market  multiplied by the number of trading days in that
period and the  immediately  preceding  three month  period;  (v) listing of the
Company's Common Stock on the New York Stock Exchange ("NYSE") or American Stock
Exchange  ("AMEX")  or  trading  of the  Company's  Common  Stock on the  NASDAQ
National Market System ("NASDAQ NMS");  and (vi) the percentage of the Company's
Common Stock  beneficially  owned by CCS and its  affiliates not being more than
4.9% of the  outstanding  Common  Stock on each closing date for the purchase of
shares of Common Stock in  accordance  with the terms of the  Structured  Equity
Line.
         As  consideration  for entering into the  Structured  Equity Line,  CCS
received a seven year warrant to purchase 125,000 shares of the Company's Common
Stock at an exercise price equal to $8.47 per share (the "Equity Line Warrant").
The Equity Line  Warrant  has been  reissued  to provide  that CCS may  purchase
91,688  shares,  BelleRock  Capital LLC, a Delaware  limited  liability  company
("BRC"),  may purchase  23,125  shares,  and Andrew Kaplan,  an individual,  may
purchase 10,187 shares. The Equity Line Warrant is not exercisable for 18 months
from the  date of  issuance,  but will  become  immediately  exercisable  if the
Company  declares a material  dividend or distribution  (other than in Shares of
Common Stock),  sells  substantially all of its assets, or enters into a merger,
consolidation  or other similar  transaction,  or there is a termination  of the
Structured  Equity  Line in  accordance  with its  terms,  and in such event the
exercise  price will be the lesser of (i) $8.47 or (ii) 80% of the  "Transaction
Value." ("Transaction Value" has the same meaning as set forth above).

         If the Company elects to issue Common Stock under the Structured Equity
Line for an  aggregate  purchase  price of more than $5 million or to extend the
term thereof  beyond April 1, 1999,  the Company will issue an additional  seven
year warrant for the  purchase of 75,000  shares of the  Company's  Common Stock
(the  "Additional  Warrant"  and,  together  with the Equity Line  Warrant,  the
"Equity Line  Warrants") at an exercise  price equal to 140% of the closing sale
price of the Common Stock at the time of the issuance of the Additional Warrant.
The  Additional  Warrant will be exercisable at the same time as the Equity Line
Warrant,  or upon issuance if the Equity Line Warrant is exercised  prior to the
issuance of such Additional  Warrant,  and would contain  provisions  similar to
those in the Equity Line Warrant


                                 USE OF PROCEEDS

         The Company will not receive any of the proceeds from the resale by the
Selling  Stockholder  of the Shares of Common Stock offered by this  Prospectus.
The Company received gross proceeds of $4 million from the sale of the Debenture
and could  receiv

<PAGE>

gross  proceeds  of up to  $2,710,400  from the  exercise  of the Warrant if the
Warrant is exercised in full. No assurance can be given that the Warrant will be
exercised.

         The $4 million that the Company received from the sale of the Debenture
was used to reduce the amount of  outstanding  indebtedness  under the Revolving
Credit.  The Company  expects  that any net  proceeds  from the  exercise of the
Warrant will be sued to further  reduce the amount of  outstanding  indebtedness
under the Revolving  Credit,  which  provides  working  capital for the Company.
Depending upon the amount and terms of the Company's  indebtedness,  the Company
also might use the  proceeds  from the  exercise  of the  Warrant to repay other
indebtedness or for general  corporate  purposes to satisfy  operating cash flow
requirements. See "RISK FACTORS - High Debt Level."


                               SELLING STOCKHOLDER

         The  Selling  Stockholder  is  Halifax  Fund,  L.P.,  a Cayman  Islands
exempted  limited  partnership.  The Selling  Stockholder has not had a material
relationship  with the  Company  within  the past three  years,  other than as a
result of entering into the  Subscription  Agreement and a related  Registration
Rights Agreement.  The Selling  Stockholder's  investment manager,  The Palladin
Group, L.P., a Delaware limited partnership ("Palladin"), is the managing member
of Cripple Creek Securities,  LLC, a Delaware limited liability company ("CCS"),
which entered into the Structured Equity Line and related agreements.  See "DEBT
AND EQUITY  FINANCING."  One of the Company's  directors  was a special  limited
partner  of  Palladin  until June 30,  1997.  The same  individual  is a general
partner of Ramius Capital Group,  L.P., which was an affiliate of Palladin until
June 30, 1997. As of the date hereof,  the Selling  Stockholder own no shares of
the Company's  Common Stock and is offering  herein for resale all of the shares
of the  Company's  Common  Stock that it may  acquire  upon the  exercise of the
Warrant. As of the date hereof, CCS owns no shares of the Company's Common Stock
and will  offer all of the  shares of the  Company's  Common  Stock  that it may
acquire  under the  Structured  Equity Line and upon the  exercise of the Equity
Line Warrant and the  Additional  Warrant in a registration  statement  separate
from the registration statement of which this Prospectus is a part.


                              PLAN OF DISTRIBUTION

         The  Selling  Stockholder,  acting as  principal  for its own  account,
directly,  through  agents  designated  from time to time,  or through  brokers,
dealers, agents or underwriters also to be designated, may sell all or a portion
of the Shares from time to time on terms to be  determined  at the time of sale.
The  Selling  Stockholder  may from time to time  sell all or a  portion  of the
Shares in routine  brokerage  transactions on the New York Stock  Exchange,  the
Pacific  Stock  Exchange or otherwise at the prices and terms  prevailing at the
time of the sale. The Selling Stockholder also may make private resales directly
or through brokers or may make resales pursuant to Rule 144 under the Securities
Act. The Selling Stockholder may pay customary  brokerage fees,  commissions and
expenses.
<PAGE>

         To the extent required pursuant to Rule 424 under the Securities Act, a
Prospectus  Supplement will be filed with the Securities and Exchange Commission
with respect to a particular  offering  setting forth the terms of any offering,
including  the  name or  names  of any  underwriters  or  agents,  if  any,  any
underwriting discounts and other items constituting underwriters'  compensation,
the offering price and any discounts or concessions allowed or reallowed or paid
to dealers.  Any  offering  price and any  discounts or  concessions  allowed or
reallowed or paid to dealers may be changed from time to time.

         If  underwriters  are used in a sale,  shares of Common  Stock  will be
acquired by the  underwriters  for their own account and may be resold from time
to time in one or more transactions,  including  negotiated  transactions,  at a
fixed public offering price or at varying prices determined at the time of sale.
The shares may be offered to the public either through  underwriting  syndicates
represented  by one or more  managing  underwriters  or  directly by one or more
firms acting as underwriters.  The underwriter or underwriters with respect to a
particular  underwritten  offering  of  shares  to be  named  in the  Prospectus
Supplement relating to such offering and, if an underwriting  syndicate is used,
the managing underwriter or underwriters, will be set forth on the cover of such
Prospectus  Supplement.  Unless otherwise set forth in the Prospectus Supplement
relating  thereto,  the  obligations of the  underwriters to purchase the Shares
will be subject to conditions  precedent and the underwriters  will be obligated
to purchase all of the shares if any are purchased.

         If  dealers  are  utilized  in the sale of shares  of  Common  Stock in
respect of which this Prospectus is delivered, the Selling Stockholder will sell
such  shares to the  dealers as  principals.  The  dealers  may then resell such
shares to the public at varying  prices to be  determined by such dealers at the
time of resale.  The names of the dealers and the terms of the transaction  will
be set forth in a Prospectus Supplement relating thereto.

         If an agent is used,  the  agent  will be  named,  and the terms of the
agency and any commissions will be set forth in a Prospectus Supplement relating
thereto. Unless otherwise indicated in the Prospectus Supplement, any such agent
will be acting on a best efforts basis for the period of its appointment.

         Shares may be sold directly by the Selling Stockholder to institutional
investors or others, who may be deemed to be underwriters  within the meaning of
the  Securities  Act with respect to any resale  thereof.  The terms of any such
sales,  including the terms of any bidding or auction process, will be described
in the Prospectus Supplement relating thereto.

         Agents,  dealers  and  underwriters  may be entitled  under  agreements
entered into with the Selling  Stockholder to  indemnification  against  certain
civil  liabilities,  including  liabilities  under  the  Securities  Act,  or to
contribution with respect to payments which such agents, dealers or underwriters
may be required to make in respect thereof. Agents, 

<PAGE>

dealers and  underwriters  may be customers of, engage in transactions  with, or
perform  services  for the Company or the Selling  Stockholder  in the  ordinary
course of business.

         The Company will bear all costs and expenses of the registration of the
Shares under the Securities Act and certain state  securities  laws. The Selling
Stockholder  will pay any transaction  costs associated with effecting any sales
that occur.

         The Selling  Stockholder is not restricted as to the price or prices at
which it may resell  Shares  acquired  upon the  exercise of the  Warrant.  Such
resales  may have an  adverse  effect on the market  price of the Common  Stock.
Moreover,  the Selling  Stockholder is not restricted as to the number of Shares
that may be sold at any one time,  and it is possible that a significant  number
of Shares could be sold at the same time,  which also may have an adverse effect
on the market  price of the  Common  Stock.  The  Selling  Stockholder  also may
distribute shares pursuant to delivery in any short sales it may make.

         The Company has agreed to  indemnify  the Selling  Stockholder  against
certain civil liabilities, including liabilities under the Securities Act.


                                  LEGAL MATTERS

         Thomas E. McCabe, the Company's Senior Vice President,  General Counsel
and  Secretary,  has  rendered  an opinion to the effect  that the Common  Stock
offered by this Prospectus is duly  authorized,  validly issued,  fully paid and
non-assessable.


                                     EXPERTS

         The  consolidated   financial  statements  and  the  related  financial
statement  schedule  incorporated  in this  Prospectus  by  reference  from  the
Company's  Annual Report on Form 10-K for the year ended June 30, 1998 have been
audited  by  Deloitte & Touche  LLP,  independent  auditors,  as stated in their
report, which is incorporated herein by reference, and have been so incorporated
in reliance  upon the report of such firm given upon their  authority as experts
in accounting and auditing.


<PAGE>


                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS


ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

                                 Not applicable.

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         The Delaware  General  Corporation  Law provides,  in  substance,  that
Delaware  corporations shall have the power, under specified  circumstances,  to
indemnify  their  directors,  officers,  employees and agents in connection with
actions  or suits by or in the right of the  corporation,  by reason of the fact
that they were or are such directors,  officers,  employees and agents,  against
expenses  (including  attorneys'  fees) and,  in the case of  actions,  suits or
proceedings brought by third parties,  against judgment,  fines and amounts paid
in  settlement  actually and  reasonably  incurred in any such  action,  suit or
proceeding.

         The Company's  Certificate  of  Incorporation  provides that a director
shall not be personally  liable to the Company or its  stockholders for monetary
damages for breach of fiduciary duty as a director  except for liability (i) for
breach of the  director's  duty of loyalty to the  Company or its  stockholders,
(ii) for acts or  omissions  not in good  faith  or  which  involve  intentional
misconduct  or a  knowing  violation  of law,  (iii)  under  Section  174 of the
Delaware  General  Corporation  Law, or (iv) for any transaction  from which the
director derived an improper personal benefit. The Company's Bylaws also provide
that the Company may indemnify its directors, officers and legal representatives
to the fullest extent  permitted by Delaware law against all awards and expenses
(including attorneys' fees).

         The Company has  purchased an insurance  policy that purports to insure
its officers and directors against certain  liabilities  incurred by them in the
discharge of their functions as officers and directors.


ITEM 16.  EXHIBITS.

Exhibit No.            Description
- -----------            -----------

4.1           Restated Certificate of Incorporation of the Company (incorporated
              by reference to Exhibit 3.1 to the Company's Annual Report on Form
              10-K for the year ended June 30, 1994).
<PAGE>

4.2           Bylaws of the Company (incorporated by reference to Exhibit 3.2 to
              the  Company's  Annual Report on Form 10-K for the year ended June
              30, 1995).

4.3++         Convertible Securities Subscription Agreement, dated as of January
              21, 1997, between the Company and Halifax Fund, L.P. (incorporated
              by reference to Exhibit 10.2 to the Company's  Quarterly Report on
              Form 10-Q for the quarter ended December 31, 1996).

4.4           $4,000,000 5% Convertible Debenture due January 30, 2000 issued by
              the Company to Halifax Fund,  L.P.  (incorporated  by reference to
              Exhibit 10.3 to the  Company's  Quarterly  Report on Form 10-Q for
              the quarter ended December 31, 1996).

4.5           320,000 Share Common Stock Purchase  Warrant issued by the Company
              to Halifax Fund, L.P.  (incorporated  by reference to Exhibit 10.4
              to the  Company's  Quarterly  Report on Form 10-Q for the  quarter
              ended December 31, 1996).

4.6           Registration  Rights  Agreement.,  dated as of January  30,  1997,
              between  the  Company  and Halifax  Fund,  L.P.  (incorporated  by
              reference to Exhibit  10.5 to the  Company's  Quarterly  Report on
              Form 10-Q for the quarter ended December 31, 1996).

5.1+          Opinion of Thomas E. McCabe.

23.1          Consent of Deloitte & Touche LLP.

23.2+         Consent of Thomas E. McCabe .

24.1+         Power of Attorney.

+        Previously filed.
++       Exhibits A, B and C to Exhibit 4.3 are incorporated  herein as Exhibits
         4.4, 4.5 and 4.6.

ITEM 17.  UNDERTAKINGS.

         (a) 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;
<PAGE>

         (ii) To reflect in the prospectus any facts or events arising after the
effective  date of  registration  statement  (or the most recent  post-effective
amendment  thereof)  which,  individually  or in  the  aggregate,  represents  a
fundamental  change in the information set forth in the registration  statement.
Notwithstanding the foregoing,  any increase or decrease in volume of securities
offered (if the total dollar value of  securities  offered would not exceed that
which  was  registered)  and any  deviation  from  the  low or  high  and of the
estimated  maximum  offering  range may be reflected  in the form of  prospectus
filed with the  Commission  pursuant  to Rule 424(b) if, in the  aggregate,  the
changes in volume  and price  represent  no more than 20  percent  change in the
maximum  aggregate  offering price set forth in the "Calculation of Registration
Fee" table in the effective registration statement.

         (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  paragraphs  (a)(1)(i)  and  (a)(1)(ii)  do  not  apply  if  the
registration statement is on Form S-3, Form S-8 or Form F-3, and the information
required to be included in a  post-effective  amendment by those  paragraphs  is
contained in periodic  reports filed with or furnished to the  Commission by the
registrant  pursuant to Section 13 or 15(d) of the  Securities  Exchange  Act of
1934 that are incorporated by reference in the registration statement.

         (2) That,  for the  purpose  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 the  registration  by  means  of a  post-effective
amendment  any of the  securities  being  registered  which remain unsold at the
termination of the offering.

         (b) 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 15(d) of the Securities
Exchange Act of 1934 (and, where applicable,  each filing of an employee benefit
plan's annual report pursuant to 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.

         (c)  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 foregoing  provisions,  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,

<PAGE>

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.



<PAGE>


                                   SIGNATURES

         Pursuant  to the  requirements  of the  Securities  Act  of  1933,  the
Registrant certifies that it has reasonable grounds to believe that it meets all
the requirements for filing on Form S-3 and has duly caused this  post-effective
amendment  to this  registration  statement  to be signed  on its  behalf by the
undersigned,  thereunto duly authorized, in the County of Fairfax,  Commonwealth
of Virginia, on September 18, 1998.

                                                GRC INTERNATIONAL, INC.

                                                By: /s/ Thomas E. McCabe
                                                --------------------------------
                                                Thomas E. McCabe
                                                Senior Vice President,
                                                General Counsel and Secretary


         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
post-effective  amendment to this registration  statement has been signed by the
following persons in the capacities and on the dates indicated below:

Signature                           Title                       Date
- -----------                         -----                      -----

/s/ Gary L. Denman *
- -----------------------------       President                 September 18, 1998
Gary L. Denman                      and Chief Executive
                                    Officer (Principal
                                    Executive Officer)

/s/ Timothy C. Halsey
- -----------------------------       Controller, Acting Chief- September 18, 1998
Timothy C. Halsey                   Financial Officer and
                                    Acting Chief Accounting
                                    Officer
                                    (Principal Financial and
                                    Accounting Officer)

/s/ Joseph R. Wright, Jr. *
- ----------------------------        Chairman and Director     September 18, 1998
Joseph R. Wright, Jr.

/s/ Peter A. Cohen *
- ---------------------------         Vice Chairman             September 18, 1998
Peter A. Cohen                      and Director



<PAGE>


/s/ H. Furlong Baldwin *
- ---------------------------         Director                  September 18, 1998
H. Furlong Baldwin

/s/ Frank J.A. Cilluffo *
- ---------------------------         Director                  September 18, 1998
Frank J.A. Cilluffo

/s/ Leslie B. Disharoon *
- ---------------------------         Director                  September 18, 1998
Leslie B. Disharoon

/s/ Charles H.P. Duell *
- ---------------------------         Director                  September 18, 1998
Charles H.P. Duell

/s/ Edward C. Meyer *
- ---------------------------         Director                  September 18, 1998
Edward C. Meyer

/s/ George R. Packard *
- ---------------------------         Director                  September 18, 1998
George R. Packard

/s/ Herbert Rabin *
- ---------------------------         Director                  September 18, 1998
Herbert Rabin

/s/ Jim Roth *
- ---------------------------         Director                  September 18, 1998
Jim Roth

/s/ E. Kirby Warren *
- ---------------------------         Director                  September 18, 1998
E. Kirby Warren



* /s/ Thomas E. McCabe
- ------------------------------
Thomas E. McCabe
Power of Attorney
<PAGE>

                                EXHIBIT INDEX


Exhibit No.              Description
- -----------              -----------

4.1           Restated Certificate of Incorporation of the Company (incorporated
              by reference to Exhibit 3.1 to the Company's Annual Report on Form
              10-K for the year ended June 30, 1994).

4.2           Bylaws of the Company (incorporated by reference to Exhibit 3.2 to
              the  Company's  Annual Report on Form 10-K for the year ended June
              30, 1995).

4.3++         Convertible Securities Subscription Agreement, dated as of January
              21, 1997, between the Company and Halifax Fund, L.P. (incorporated
              by reference to Exhibit 10.2 to the Company's  Quarterly Report on
              Form 10-Q for the quarter ended December 31, 1996).

4.4           $4,000,000 5% Convertible Debenture due January 30, 2000 issued by
              the Company to Halifax Fund,  L.P.  (incorporated  by reference to
              Exhibit 10.3 to the  Company's  Quarterly  Report on Form 10-Q for
              the quarter ended December 31, 1996).

4.5           320,000 Share Common Stock Purchase  Warrant issued by the Company
              to Halifax Fund, L.P.  (incorporated  by reference to Exhibit 10.4
              to the  Company's  Quarterly  Report on Form 10-Q for the  quarter
              ended December 31, 1996).

4.6           Registration  Rights  Agreement.,  dated as of January  30,  1997,
              between  the  Company  and Halifax  Fund,  L.P.  (incorporated  by
              reference to Exhibit  10.5 to the  Company's  Quarterly  Report on
              Form 10-Q for the quarter ended December 31, 1996).

5.1+          Opinion of Thomas E. McCabe.

23.1          Consent of Deloitte & Touche LLP.

23.2+         Consent of Thomas E. McCabe .

24.1+         Power of Attorney.

+        Previously filed.
++       Exhibits A, B and C to Exhibit 4.3 are incorporated  herein as Exhibits
         4.4, 4.5 and 4.6.




                                                                Exhibit 23.1


                          INDEPENDENT AUDITORS' CONSENT

         We consent to the  incorporation  by reference  in this  Post-Effective
Amendment No. 2 to Registration  Statement No.  333-22147 of GRC  International,
Inc. of our report dated July 28, 1998,  appearing in the Annual  Report on Form
10-K of GRC  International,  Inc. for the year ended June 30,  1998,  and to the
reference to us under the heading "Experts" in the Prospectus,  which is part of
such Registration Statement.



DELOITTE & TOUCHE LLP
McLean, Virginia
September 18, 1998


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