GOVERNMENT SEC INC FD US TREA STRAT TR 1 DEFINED ASSET FDS
485BPOS, 1998-07-22
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<PAGE>
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JULY 22, 1998
 
                                                       REGISTRATION NO. 33-48915
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
 
                             WASHINGTON, D.C. 20549
 
                   ------------------------------------------
 
                         POST-EFFECTIVE AMENDMENT NO. 5
                                       TO
                                    FORM S-6
 
                   ------------------------------------------
 
                   FOR REGISTRATION UNDER THE SECURITIES ACT
                    OF 1933 OF SECURITIES OF UNIT INVESTMENT
                        TRUSTS REGISTERED ON FORM N-8B-2
 
                   ------------------------------------------
 
A. EXACT NAME OF TRUST:
 
                             DEFINED ASSET FUNDS--
                       GOVERNMENT SECURITIES INCOME FUND
                        U.S. TREASURY STRATEGY TRUST--1
                           (A UNIT INVESTMENT TRUST)
 
B. NAMES OF DEPOSITORS:
 
               MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
                               SMITH BARNEY INC.
                       PRUDENTIAL SECURITIES INCORPORATED
                           DEAN WITTER REYNOLDS INC.
                            PAINEWEBBER INCORPORATED
 
C. COMPLETE ADDRESSES OF DEPOSITORS' PRINCIPAL EXECUTIVE OFFICES:
 

 MERRILL LYNCH, PIERCE,
     FENNER & SMITH
      INCORPORATED
 UNIT INVESTMENT TRUSTS
  POST OFFICE BOX 9051
PRINCETON, NJ 08543-9051                              SMITH BARNEY INC.
                                                   TWO WORLD TRADE CENTER
                                                         101ST FLOOR
                                                     NEW YORK, NY 10048

 

  PRUDENTIAL SECURITIES  PAINEWEBBER INCORPORATED DEAN WITTER REYNOLDS INC.
      INCORPORATED          1285 AVENUE OF THE         TWO WORLD TRADE
   ONE NEW YORK PLAZA            AMERICAS            CENTER--59TH FLOOR
   NEW YORK, NY 10292       NEW YORK, NY 10019       NEW YORK, NY 10048

 
D. NAMES AND COMPLETE ADDRESSES OF AGENTS FOR SERVICE:
 

  TERESA KONCICK, ESQ.       ROBERT E. HOLLEY        LAURIE A. HESSLEIN
      P.O. BOX 9051          1200 HARBOR BLVD.        388 GREENWICH ST.
PRINCETON, NJ 08543-9051    WEEHAWKEN, NJ 07087      NEW YORK, NY 10013
 
   LEE B. SPENCER, JR.          COPIES TO:           DOUGLAS LOWE, ESQ.
   ONE NEW YORK PLAZA     PIERRE DE SAINT PHALLE, DEAN WITTER REYNOLDS INC.
   NEW YORK, NY 10292              ESQ.                TWO WORLD TRADE
                           450 LEXINGTON AVENUE      CENTER--59TH FLOOR
                            NEW YORK, NY 10017       NEW YORK, NY 10048

 
The issuer has registered an indefinite number of Units under the Securities Act
of 1933 pursuant to Rule 24f-2 and filed the Rule 24f-2 Notice for the most
recent fiscal year on March 11, 1998.
 
Check box if it is proposed that this filing will become effective on July 31,
1998 pursuant to paragraph (b) of Rule 485.  / x /
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                                                   DEFINED ASSET FUNDSSM
- --------------------------------------------------------------------------------
 

GOVERNMENT                    The objective of this Defined Fund is safety of
SECURITIES                    capital and current monthly income by investing in
INCOME FUND                   a portfolio of interest-bearing U.S. Treasury
U.S. TREASURY STRATEGY        securities with maturities of approximately one to
TRUSTSM--1                    five years. These securities are backed by the
(A UNIT INVESTMENT TRUST)     full faith and credit of the United States
- ------------------------------Government. By dividing its holdings among
/ / U.S. GOVERNMENT SECURITIESsecurities with staggered maturities, the fund
/ / LADDERED MATURITIES       forms a 'ladder' of investments. Laddering
/ / MONTHLY INCOME            arranges maturities over specified periods of time
/ / REINVESTMENT OPTION       which can reduce risk from interest rate
                              fluctuations. This strategy is also designed to
                              produce a higher overall yield than shorter-term
                              investments. Approximately once a year until 2007,
                              the proceeds of each maturing Security in the
                              Portfolio will be reinvested (an 'Extension')
                              automatically into a then available U.S. Treasury
                              security with a maturity of approximately five
                              years (an 'Extension Security'). By continually
                              reinvesting in five-year treasuries, the Fund is
                              always invested in these longer-term, usually
                              higher-yielding securities while maintaining for
                              most of the Fund's life an average weighted
                              maturity of 2 1/2 years for lower price
                              volatility. Interest income is exempt from state
                              personal income taxes in all states. There can be
                              no assurance that the Fund will achieve its
                              objective.
                              The value of units will fluctuate with the value
                              of the Portfolio.
                              Minimum purchase: $250.

 

                              --------------------------------------------------
                              THESE SECURITIES HAVE NOT BEEN APPROVED OR
                              DISAPPROVED
                              BY THE SECURITIES AND EXCHANGE COMMISSION OR ANY
                              STATE
                              SECURITIES COMMISSION NOR HAS THE COMMISSION OR
                              ANY
SPONSORS:                     STATE SECURITIES COMMISSION PASSED UPON THE
Merrill Lynch,                ACCURACY
Pierce, Fenner & Smith        OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION
Incorporated                  TO THE CONTRARY IS A CRIMINAL OFFENSE.
Smith Barney Inc.             INQUIRIES SHOULD BE DIRECTED TO THE TRUSTEE AT
PaineWebber Incorporated      1-800-323-1508
Prudential Securities         PROSPECTUS DATED JULY 31, 1998.
Incorporated                  READ AND RETAIN THIS PROSPECTUS FOR FUTURE
Dean Witter Reynolds Inc.     REFERENCE.
 

 
<PAGE>
- --------------------------------------------------------------------------------
 
Defined Asset FundsSM
Defined Asset Funds is America's oldest and largest family of unit investment
trusts, with over $115 billion sponsored over the last 25 years. Each Defined
Asset Fund is a portfolio of preselected securities. The portfolio is divided
into 'units' representing equal shares of the underlying assets. Each unit
receives an equal share of income and principal distributions.
 
Defined Asset Funds offer several defined 'distinctives'. You know in advance
what you are investing in and that changes in the portfolio are limited - a
defined portfolio. Most defined bond funds pay interest monthly - defined
income. The portfolio offers a convenient and simple way to invest - simplicity
defined.
 
Your financial professional can help you select a Defined Asset Fund to meet
your personal investment objectives. Our size and market presence enable us to
offer a wide variety of investments. The Defined Asset Funds family offers:
 
  o Municipal portfolios
o Corporate portfolios
o Government portfolios
o Equity portfolios
o International portfolios
 
The terms of Defined Funds are as short as one year or as long as 30 years.
Special defined funds are available including: insured funds, double and triple
tax-free funds and funds with 'laddered maturities' to help protect against
changing interest rates. Defined Asset Funds are offered by prospectus only.
- ----------------------------------------------------------------
Defined U.S. Treasury Portfolio
- ----------------------------------------------------------------
 
Our defined portfolio of U.S. Treasury securities offers you a simple and
convenient way to participate in the U.S. Treasury market and obtain monthly
income while earning an attractive return.
 
INVESTMENT OBJECTIVES
To obtain safety of capital as well as current monthly income through investment
in an extendable portfolio consisting of U.S. Treasury securities with laddered
maturities of approximately one to five years. The Fund seeks to reduce unit
price fluctuations with changing interest rates by reinvesting the proceeds of
maturing securities approximately once a year until 2007 into Extension
Securities with maturities of approximately five years so that the Fund will
maintain a Portfolio of securities with a weighted average maturity of
approximately 2 1/2 years.
- ----------------------------------------------------------------
Defining Your Portfolio
- ----------------------------------------------------------------
 
PORTFOLIO COMPOSITION
 
As of the evaluation date, April 30, 1998, the Portfolio contains 5 different
issues of U.S. Treasury securities with fixed final maturity dates ranging from
1999 to 2003. The percentage relationships are as follows: 6.75% coupons
maturing 6/30/99, 20%; 6.875% coupons maturing 3/31/00, 20%; 6.375% coupons
maturing 3/31/01, 20%; 6.00% coupons maturing 7/31/02, 20% and 5.50% coupons
maturing 3/31/03, 20%. As each U.S. Treasury security matures, until
approximately 2007, the proceeds (minus the deferred sales charge payable to the
Sponsors) will be automatically reinvested into new five-year U.S. Treasury
securities. For the last five years of the Fund, proceeds of maturing securities
will be distributed to investors as they become available, returning
approximately 20% of the Portfolio as of the last year in which an Extension
occurs on maturity of each Security.
 
CALL PROTECTION
 
100% of the aggregate face amount of the Portfolio is not subject to redemption
prior to maturity but is payable in full at the stated maturity amounts.
- ----------------------------------------------------------------
Defining Your Risks
- ----------------------------------------------------------------
 
U.S. Government securities are not affected by credit risk but are subject to
changes in market value resulting from changes in interest rates. Therefore, an
investment in units of the Fund should be made with an understanding of the
risks which an investment in fixed-rate short and intermediate term debt
obligations may entail, including the risk that the value of the Portfolio and
hence of the units will decline with increases in interest rates. Holders should
also understand that while the weighted average maturity of the Portfolio is
approximately 2 1/2 years, until approximately 2007 it will range from a low of
one year to a high of five years, depending on the time to the next extension
date.
There is no guarantee that the Fund will achieve its investment objective. The
Fund is not backed by the full faith and credit of the U.S. Government.
 
                                      A-2
<PAGE>
- ----------------------------------------------------------------
Defining Your Income
- ----------------------------------------------------------------
 
MONTHLY INCOME DISTRIBUTIONS
 
The Fund pays monthly income, even though the securities generally pay interest
semi-annually.
 
WHAT YOU MAY EXPECT
(PAYABLE ON THE 25TH DAY OF THE MONTH TO HOLDERS OF RECORD ON THE 10TH DAY OF
THE MONTH):
 

Regular Monthly Income per unit                          $    5.02
Annual Income per unit:                                  $   60.31

 
These figures are estimates and actual payments may vary.
 
- ----------------------------------------------------------------
Defining Your Investment
- ----------------------------------------------------------------
 
PUBLIC OFFERING PRICE PER 1,000 UNITS                  $807.02
 
The Public Offering Price as of April 30, 1998, the Evaluation Date, is based on
the aggregate offer side evaluation of the underlying securities ($119,242,379)
divided by the number of units outstanding (120,248,684) times 1,000, plus the
initial sales charge. The Public Offering Price on any subsequent date will
vary. An amount equal to net accrued but undistributed interest on the unit is
added to the Public Offering Price. The underlying securities are valued by the
Trustee on the basis of their closing sale prices at 3:30 p.m. Eastern time on
every business day.
 
LOW MINIMUM INVESTMENT
 
You can get started with a minimum purchase of $250. There is no minimum
purchase for payroll deduction plans.
 
SALES CHARGES
 
The total sales charge for this investment combines an initial up-front sales
charge and a maximum of nine annual deferred sales charges that will be paid
from the proceeds of maturing Securities on their maturity dates (each a
'Deferred Charge Payment Date'). The initial sales charge is reduced on quantity
purchases. If an investor sells or redeems units before a Deferred Charge
Payment Date, no future deductions of deferred sales charges will be collected
from that investor. This will have the effect of reducing the rate of sales
charges paid by that investor.
 
DISTRIBUTIONS
In addition to monthly income distributions, distributions of any capital gain
net income (i.e., the excess of capital gains over capital losses) recognized by
the Fund in any taxable year will be made annually shortly before or after the
end of the year. Until 2007, the proceeds from maturing Securities will be
automatically reinvested into new Securities if available with maturities of
approximately five years. Therafter, a distribution will be made in cash when
each remaining Security in the Fund matures.
 
REINVESTMENT OPTION
 
You can elect to automatically reinvest your distributions into additional units
of the Portfolio subject only to the deferred sales charge remaining at the time
of reinvestment. Reinvesting helps to compound your income for a greater total
return.
 
TAXES
 
Individual investors will not be subject to any state or local personal income
taxes on distributions of the Fund's interest income. Distributions of ordinary
income or capital gain from the Fund will constitute dividends for Federal
income tax purposes, but will not be eligible for the dividends-received
deduction for corporations.
 
Distributions to investors who are not U.S. citizens or residents will generally
be subject to withholding tax at the statutory rate of 30% (or a lesser treaty
rate). Because interest income of the type received by the Fund would generally
not be subject to withholding if received directly by a foreign investor, an
investment in the Fund is likely to be appropriate for a foreign investor only
when that foreign investor can utilize a foreign tax credit or corresponding
benefit in respect of such withholding tax.
 
- ----------------------------------------------------------------
Defining Your Costs
- ----------------------------------------------------------------
 
SALES CHARGE
 
First-time investors pay a 1.25% sales charge when they buy. In addition,
deferred sales charges of $3.75 per 1,000 units will be paid from the proceeds
of maturing Securities on each Deferred Charge Payment Date until 2007 (a
maximum of $33.75 through the final Deferred Charge Payment Date). This deferred
method of payment keeps more of your money invested over a longer period of
time. Although this is a unit investment trust rather than a mutual fund, the
following information is presented to permit a comparison of fees and an
understanding of the direct or indirect costs and expenses that you pay.
 

                                      As a %
                                   of Public          Amount per
                              Offering Price         1,000 Units
                              -------------------  ---------------
Maximum Initial Sales Charge            1.25%        $     12.56
Deferred Sales Charge                   3.36%              33.75
                              -------------------  ---------------
                                        4.61%        $     46.31
                              -------------------  ---------------
                              -------------------  ---------------
Maximum Sales Charge Imposed
  on Reinvested Dividends               3.36%        $     33.75

 
                                      A-3
<PAGE>
ESTIMATED ANNUAL FUND OPERATING EXPENSES
 

                                                     Amount per
                                                    1,000 Units
                                                  ---------------
Trustee's Fee                                       $      0.28
Portfolio Supervision, Bookkeeping and
  Administrative Fees                               $      0.31
Evaluator's Fee                                     $      0.02
Other Operating Expenses                            $      0.71
                                                  ---------------
TOTAL                                               $      1.32

 
REDEEMING OR SELLING YOUR INVESTMENT
 
You may redeem or sell your units at any time. Your price will be based on the
then current net asset value (based on the offer side evaluation of the bonds
during the initial public offering period and on the lower, bid side evaluation
thereafter, as determined by an independent evaluation, plus accrued interest).
The redemption and secondary market repurchase price as of April 30, 1998 was
$991.63 per 1,000 units ($12.56 per 1,000 units less than the Public Offering
Price). If you sell your units before the termination of the Portfolio, you will
not pay the remaining deferred sales charges. There is no fee for redeeming or
selling Units.
 
                                      A-4


<PAGE>

THE GOVERNMENT SECURITIES INCOME FUND,
U.S. TREASURY STRATEGY TRUST - 1, DEFINED ASSET FUNDS

REPORT OF INDEPENDENT ACCOUNTANTS

The Sponsors, Trustee and Holders
  of The Government Securities Income Fund,
  U.S. Treasury Strategy Trust - 1, Defined Asset Funds:

We have audited the accompanying statement of condition of The Government
Securities Income Fund, U.S. Treasury Strategy Trust - 1, Defined Asset Funds,
including the portfolio, as of April 30, 1998 and the related statements of
operations and of changes in net assets for the years ended April 30, 1998, 1997
and 1996.  These financial statements are the responsibility of the Trustee.
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.  Securities owned at
April 30, 1998, as shown in such portfolio, were confirmed to us by The Chase
Manhattan Bank, the Trustee.  An audit also includes assessing the accounting
principles used and significant estimates made by the Trustee, 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 financial statements referred to above present fairly, in
all material respects, the financial position of The Government Securities
Income Fund, U.S. Treasury Strategy Trust - 1, Defined Asset Funds at April 30,
1998 and the results of its operations and changes in its net assets for the
above-stated years in conformity with generally accepted accounting principles.

DELOITTE & TOUCHE LLP

New York, N.Y.
July 14, 1998
                                      D-1
<PAGE>

THE GOVERNMENT SECURITIES INCOME FUND,
U.S. TREASURY STRATEGY TRUST - 1, DEFINED ASSET FUNDS

STATEMENT OF CONDITION
AS OF APRIL 30, 1998

<TABLE>

<S>                                                                     <C>
TRUST PROPERTY:
  Investment in marketable securities - at value
    (cost $118,050,584) (Note 1)                                        $119,021,847











  Accrued interest receivable                                              1,270,131

            Total trust property                                         120,291,978

LESS LIABILITIES:
  Deferred sales charge payable                          $    450,933
  Advance from Trustee                                        348,403
  Accrued Sponsors' fees                                       14,138
  Due to Sponsors                                              21,676        835,150

NET ASSETS, REPRESENTED BY:
  120,248,684 units of fractional undivided interest
    outstanding (Note 3)                                  119,025,397
  Undistributed net investment income                         431,431   $119,456,828

UNIT VALUE ($119,456,828/120,248,684 units)                                 $0.99341


                  See Notes to Financial Statements.

</TABLE>
                                             D-2
<PAGE>

THE GOVERNMENT SECURITIES INCOME FUND,
U.S. TREASURY STRATEGY TRUST - 1, DEFINED ASSET FUNDS

STATEMENTS OF OPERATIONS

<TABLE><CAPTION>

                                                             Years Ended April 30,
                                                         1998         1997         1996

<S>                                                   <C>          <C>          <C>
INVESTMENT INCOME:
  Interest income                                     $7,230,871   $5,818,631   $4,621,610
  Trustee's fees and expenses                           (115,877)    (110,386)    (106,638)
  Sponsors' fees                                         (40,135)     (13,770)     (12,876)

  Net investment income                                7,074,859    5,694,475    4,502,096

REALIZED AND UNREALIZED GAIN (LOSS) ON
  INVESTMENTS:
  Realized gain on securities sold or redeemed           581,339      208,200       22,563
  Unrealized appreciation (depreciation) of
    investments                                          754,842     (379,893)   1,532,731

NET REALIZED AND UNREALIZED GAIN (LOSS) ON
  INVESTMENTS                                          1,336,181     (171,693)   1,555,294

NET INCREASE IN NET ASSETS RESULTING FROM
  OPERATIONS                                          $8,411,040   $5,522,782   $6,057,390













                  See Notes to Financial Statements.
</TABLE>
                                             D-3
<PAGE>

THE GOVERNMENT SECURITIES INCOME FUND,
U.S. TREASURY STRATEGY TRUST - 1, DEFINED ASSET FUNDS

STATEMENTS OF CHANGES IN NET ASSETS

<TABLE><CAPTION>

                                                          Years Ended April 30,
                                                    1998           1997           1996

<S>                                             <C>            <C>             <C>
OPERATIONS:
  Net investment income                         $  7,074,859   $  5,694,475    $ 4,502,096
  Realized gain on securities sold
    or redeemed                                      581,339        208,200         22,563
  Unrealized appreciation (depreciation)
    of investments                                   754,842       (379,893)     1,532,731

  Net increase in net assets resulting
    from operations                                8,411,040      5,522,782      6,057,390

DISTRIBUTIONS TO HOLDERS (Note 2):
  Income                                          (6,978,858)    (5,639,744)    (4,459,871)
  Principal                                         (279,233)      (123,807)

  Total distributions                             (7,258,091)    (5,763,551)    (4,459,871)

DEFERRED SALES CHARGES (Note 5)                     (894,892)      (321,330)

CAPITAL SHARE TRANSACTIONS:
  Issuances of 35,978,331, 20,332,658 and
    11,988,833 units, respectively                35,827,867     20,214,589     12,030,128
  Redemptions of 21,750,258 and 1,007,465
    units, respectively                          (21,866,956)                   (1,025,479)

  Net capital share transactions                  13,960,911     20,214,589     11,004,649

NET INCREASE IN NET ASSETS                        14,218,968     19,652,490     12,602,168

NET ASSETS AT BEGINNING OF YEAR                  105,237,860     85,585,370     72,983,202

NET ASSETS AT END OF YEAR                       $119,456,828   $105,237,860    $85,585,370

PER UNIT:
  Income distributions during year                  $0.05955       $0.05877       $0.05464

  Principal distributions during year               $0.00221       $0.00124

  Net asset value at end of year                    $0.99341       $0.99262       $0.99880












TRUST UNITS OUTSTANDING AT END OF YEAR           120,248,684    106,020,611     85,687,953


                  See Notes to Financial Statements.
</TABLE>
                                             D-4
<PAGE>

THE GOVERNMENT SECURITIES INCOME FUND,
U.S. TREASURY STRATEGY TRUST - 1, DEFINED ASSET FUNDS

NOTES TO FINANCIAL STATEMENTS

1.  SIGNIFICANT ACCOUNTING POLICIES

    The Fund is registered under the Investment Company Act of 1940 as a Unit
Investment Trust.  The following is a summary of significant accounting
policies consistently followed by the Fund in the preparation of its
financial statements.  The policies are in conformity with generally
accepted accounting principles.

(a) Securities are stated at value as determined by the Evaluator based on
bid side evaluations for the securities (see "How to Sell Units -
Trustee's Redemption of Units" in this Prospectus, Part B).  The cost
of securities deposited subsequent to the initial date of deposit are
based on offering side evaluations at dates of purchase.  Gains or
losses on sales of securities are computed using the first-in, first-
out method.

(b) The Fund is not subject to income taxes.  Accordingly, no provision
for such taxes is required.

(c) Interest income is recorded as earned.

2.  DISTRIBUTIONS

    Net investment income is distributed to Holders each month.  Receipts other
than interest, after deductions for redemptions and applicable expenses,
are distributed as explained in "Income and Distributions - Distributions"
in this Prospectus, Part B.

3.  NET CAPITAL

Cost of 120,248,684 units at Dates of Deposit                 $120,996,952
Less sales charges (including deferred sales charges paid)       3,212,522
Net amount applicable to Holders                               117,784,430
Redemption of units - net cost of 25,518,351 units
  redeemed less redemption amounts                                 (72,416)
Realized gain on securities sold or redeemed                       745,160
Principal distributions                                           (403,040)
Net unrealized appreciation of investments                         971,263
Net capital applicable to Holders                             $119,025,397


4.  INCOME TAXES












    All Fund items of income received, expenses paid, and realized gains and
losses on securities sold are attributable to the Holders, on a pro rata
basis, for Federal income tax purposes in accordance with the grantor trust
rules of the United States Internal Revenue Code.

    At April 30, 1998, the cost of investment securities for Federal income tax
purposes was approximately equivalent to the cost as shown in the fund's
portfolio.

                                      D-5
<PAGE>

THE GOVERNMENT SECURITIES INCOME FUND,
U.S. TREASURY STRATEGY TRUST - 1, DEFINED ASSET FUNDS

NOTES TO FINANCIAL STATEMENTS

5.  DEFERRED SALES CHARGES

    Deferred sales charges are paid to the Sponsors as described in this
Prospectus, Part A.

                                      D-6
<PAGE>

THE GOVERNMENT SECURITIES INCOME FUND,
U.S. TREASURY STRATEGY TRUST - 1, DEFINED ASSET FUNDS

PORTFOLIO
AS OF APRIL 30, 1998
<TABLE><CAPTION>
     Portfolio No. and Title of          Face       Interest
             Securities                 Amount        Rate      Maturities       Cost(1)      Value(1)

<S>                                 <C>              <C>         <C>         <C>           <C>
1.  United States Treasury Notes    $ 23,617,000     6.750%      6/30/99     $ 23,732,797  $ 23,919,605

2.  United States Treasury Notes      23,588,000     6.875       3/31/00       23,785,467    24,118,730

3.  United States Treasury Notes      23,541,000     6.375       3/31/01       23,691,387    23,997,107

4.  United States Treasury Notes      23,341,000     6.000       7/31/02       23,470,864    23,618,174

5.  United States Treasury Notes      23,530,000     5.500       3/31/03       23,370,069    23,368,231

TOTAL                               $117,617,000                             $118,050,584  $119,021,847
</TABLE>
(1)  See note 1 to Financial Statements.

                                    D-7


<PAGE>
                         AUTHORIZATION FOR REINVESTMENT
                       GOVERNMENT SECURITIES INCOME FUND
                        U.S. TREASURY STRATEGY TRUST--1
                              DEFINED ASSET FUNDS
/ / YES, I WANT TO PARTICIPATE IN THE FUND'S REINVESTMENT PLAN AND PURCHASE
ADDITIONAL UNITS OF THE FUND EACH MONTH.
     I hereby acknowledge receipt of the Prospectus for Government Securities
Income Fund, U.S. Treasury Strategy Trust--1, Defined Asset and authorize The
Chase Manhattan Bank to pay distributions on my Units as indicated below
(distributions to be reinvested will be paid for my account to The Chase
Manhattan Bank).
 

          Income distributions
                  (check one):         / / in cash      / / reinvested

 
Please print or type
 

Name                                Registered Holder
Address
                                    Registered Holder
                               (Two signatures required if
                                      joint tenancy)
City  State  Zip Code

 
     This page is a self-mailer. Please complete the information above, cut
along the dotted line, fold along the lines on the reverse side, tape, and mail
with the Trustee's address displayed on the outside.
 
12345678
<PAGE>
 

BUSINESS REPLY MAIL                                              NO POSTAGE
FIRST CLASS PERMIT NO. 644, NEW YORK, N.Y.                       NECESSARY
                                                                 IF MAILED
POSTAGE WILL BE PAID BY ADDRESSEE                                  IN THE
          GOVERNMENT SECURITIES INCOME FUND                    UNITED STATES
          U.S. TREASURY STRATEGY TRUST--1
          THE CHASE MANHATTAN BANK
          RETAIL PROCESSING DEPARTMENT
          BOWLING GREEN STATION
          P.O. BOX 5179
          NEW YORK, N.Y. 10274-5179

 
- --------------------------------------------------------------------------------
                            (Fold along this line.)
 
- --------------------------------------------------------------------------------
                            (Fold along this line.)
<PAGE>
                               PROSPECTUS--PART B
       GOVERNMENT SECURITIES INCOME FUND--U.S. TREASURY STRATEGY TRUSTSM
                             DEFINED ASSET FUNDSSM
 
   THIS PART B OF THE PROSPECTUS MAY NOT BE DISTRIBUTED UNLESS ACCOMPANIED OR
                              PRECEDED BY PART A.
 FURTHER DETAIL REGARDING ANY OF THE INFORMATION PROVIDED IN THE PROSPECTUS MAY
                                  BE OBTAINED
      WITHIN FIVE DAYS BY WRITING OR CALLING THE TRUSTEE, THE ADDRESS AND
 TELEPHONE NUMBER OF WHICH ARE SET FORTH ON THE BACK COVER OF THIS PROSPECTUS.
 
                                     Index
 

                                                          PAGE
                                                        ---------
Fund Description......................................          1
Risk Factors..........................................          2
How to Buy Units......................................          3
How to Sell Units.....................................          4
Income, Distributions and Reinvestment................          5
Fund Expenses.........................................          6
Taxes.................................................          7
Records and Reports...................................          9
                                                          PAGE
                                                        ---------
Trust Indenture.......................................          9
Miscellaneous.........................................         10
Supplemental Information..............................         11
Appendix A--Sales Charge Schedules....................        a-1

 
FUND DESCRIPTION
 
PORTFOLIO SELECTION
 
     Professional buyers and research analysts for Defined Asset Funds, with
access to extensive research, selected the Securities for the Portfolio after
considering the Fund's investment objectives as well as the availability of the
Securities, the price of the Securities compared to similar securities and the
extent to which they were trading at discounts or premiums to par, and the
maturities of the Securities. Only issues meeting these stringent criteria of
the Defined Asset Funds team of dedicated research analysts are included in the
Portfolio. No leverage or borrowing is used nor does the Portfolio contain other
kinds of securities to enhance yield. Yields on U.S. Government securities
depend on many factors including general money market conditions, general
conditions of the bond markets and prevailing interest rates.
 
     The Portfolio contains interest-bearing U.S. Treasury securities, including
certain additional interest-bearing U.S. Treasury securities subsequently
acquired by the Fund through the reinvestment of the proceeds of maturing
securities (less an amount for deferred sales charge obligations) to take place
approximately once a year ('Extensions'). The deposit of the Securities in the
Fund on the initial date of deposit established a proportionate relationship
among the face amounts of the Securities. Following the initial date of deposit
the Sponsors may deposit additional Securities, including Extension Securities,
in order to create new Units, maintaining to the extent possible that original
proportionate relationship.
 
     Because each Defined Asset Fund is a preselected portfolio of securities,
you know the terms of the Securities before you invest. Of course, the Portfolio
will change somewhat over time, as Extension Securities are deposited, and as
Securities mature, are redeemed or are sold to meet Unit redemptions or in other
limited circumstances. Because the Portfolio is not actively managed and
principal is returned as the Securities are disposed of, this principal should
be relatively unaffected by changes in interest rates.
 
     In addition, until 2007, the proceeds from maturing Securities (less an
amount necessary to satisfy the investors' deferred sales charge obligation) may
be reinvested into Extension Securities with maturities of approximately five
years and at prices at or close to par, if possible; if appropriate Extension
Securities are not available in any of those years, and in each year subsequent
to approximately the fourteenth year of the Fund in which a Security matures,
the proceeds will be distributed to investors upon maturity of the Security.
 
                                       1
<PAGE>
PORTFOLIO SUPERVISION
 
     The Fund follows a buy and hold investment strategy in contrast to the
frequent portfolio changes of a managed fund based on economic, financial and
market analyses. Experienced financial analysts regularly review the Portfolio
and a Security may be sold in certain circumstances including the occurrence of
a default in payment on the Security or any other securities backed by the full
faith and credit of the United States, institution of certain legal proceedings,
if the Security becomes inconsistent with the Fund's investment objectives, a
decline in the price of the Security or the occurrence of other market or credit
factors that, in the opinion of Defined Asset Funds research analysts, makes
retention of the Security detrimental to the interests of investors.
 
     The Sponsors and the Trustee are not liable for any default or defect in a
Security. If a contract to purchase any Security fails, the Sponsors may
generally deposit a replacement security so long as it is a security issued by
the U.S. Treasury and has a fixed maturity date substantially similar to the
failed Security. A replacement security must be deposited within 110 days after
deposit of the failed contract, at a cost that does not exceed the funds
reserved for purchasing the failed Security and at a yield to maturity and
current return substantially equivalent (considering then current market
conditions and relative creditworthiness) to those of the failed Security, as of
the date the failed contract was deposited.
 
RISK FACTORS
 
     An investment in the Fund entails certain risks, including the risk that
the value of your investment will decline with increases in interest rates. The
U.S. Treasury obligations included in the Portfolio, though backed by the full
faith and credit of the United States, are subject to changes in market value
when interest rates fluctuate. Generally speaking, securities with longer
maturities will fluctuate in value more than securities with shorter maturities.
In recent years there have been wide fluctuations in interest rates and in the
value of fixed-rate bonds generally. The Sponsors cannot predict the direction
or scope of any future fluctuations.
 
     Certain of the Securities may have been deposited at a market discount or
premium principally because their interest rates are lower or higher than
prevailing rates on comparable debt securities. The current returns of market
discount securities are lower than comparably rated securities selling at par
because discount securities tend to increase in market value as they approach
maturity. The current returns of market premium securities are higher than
comparably rated securities selling at par because premium securities tend to
decrease in market value as they approach maturity. Because part of the purchase
price is returned through current income payments and not at maturity, an early
redemption at par of a premium security will result in a reduction in yield to
the Fund. Market premium or discount attributable to interest rate changes does
not indicate market confidence or lack of confidence in the issue.
 
LITIGATION AND LEGISLATION
 
     The Sponsors do not know of any pending litigation as of the date of this
Prospectus which might reasonably be expected to have a material adverse effect
upon the Fund. At any time after the initial date of deposit, litigation may be
initiated on a variety of grounds, or legislation may be enacted, affecting the
Securities in the Fund.
 
PAYMENT OF THE SECURITIES AND LIFE OF THE FUND
 
     The size and composition of the Fund will be affected by the level of
redemptions of Units that may occur from time to time. Principally, this will
depend upon the number of investors seeking to sell or redeem their Units and
whether or not the Sponsors are able to sell the Units acquired by them in the
secondary market. As a result, Units offered in the secondary market may not
represent the same face amount of Securities as on the initial date of deposit.
Factors that the Sponsors will consider in determining whether or not to sell
Units acquired in the secondary market include the size of the Fund relative to
its original size, the ratio of Fund expenses to income, the Fund's current and
long-term returns, the degree to which Units may be selling at a premium over
par and the cost of maintaining a current prospectus for the Fund. These factors
may also lead the Sponsors to seek to terminate the Fund earlier than its
mandatory termination date.
 
FUND TERMINATION
 
     The Fund generally will be terminated no later than one year following the
maturity date of the last maturing Security in the Portfolio. It will terminate
earlier upon the disposition of the last Security or upon the consent of
investors holding 51% of the Units. The Fund may also be terminated earlier by
the Sponsors once the total assets of the Fund have fallen below 40% of the
value of Securities when deposited. A decision by the Sponsors to
 
                                       2
<PAGE>
terminate the Fund early will be based on factors similar to those considered by
the Sponsors in determining whether to continue the sale of Units in the
secondary market.
 
     Notice of impending termination will be provided to investors and
thereafter Units will no longer be redeemable. On or shortly before termination,
the Fund will seek to dispose of any Securities remaining in the Portfolio
although any Security unable to be sold at a reasonable price may continue to be
held by the Trustee in a liquidating trust pending its final disposition. A
proportional share of the expenses associated with termination, including
brokerage costs in disposing of Securities, will be borne by investors remaining
at that time. This may have the effect of reducing the amount of proceeds those
investors are to receive in any final distribution.
 
HOW TO BUY UNITS
 
PUBLIC OFFERING PRICE
 
     Units are available from any of the Sponsors, Underwriters and other
broker-dealers at the Public Offering Price plus accrued interest on the Units.
The Public Offering Price varies each Business Day with changes in the value of
the Portfolio and other assets and liabilities of the Fund. In the initial
offering period (expected to last until 2007), the Public Offering Price is
based on the next offer side evaluation of the Securities, and includes a sales
charge based on the number of Units of the Fund purchased on any one day by a
single purchaser (see Initial Offering sales charge schedule in Appendix A). In
the secondary market (after the initial offering period), the Public Offering
Price is based on the bid side evaluation of the Bonds, and includes a sales
charge based on the number of Units of the Fund purchased in the secondary
market on the same day by a single purchaser (see Secondary Market sales charge
schedule in Appendix A). Purchases in the secondary market of one or more Series
sponsored by the Sponsors that have the same rates of sales charge may be
aggregated.
 
     Purchase of Units is subject to (i) an initial sales charge at the rates
set forth in the table below and (ii) a maximum of 10 deferred sales charges of
$3.75 per 1,000 Units payable from the proceeds of maturing Securities on their
maturity date (each a 'Deferred Charge Payment Date'). The percentages which the
aggregate sales charges represent of the Public Offering Price per 1,000 Units
at various intervals are shown in the chart below. If you sell or redeem Units
before the final Deferred Charge Payment Date, no deferred sales charge
deduction will be made from the proceeds, and this will have the effect of
reducing the aggregate sales charges. Similarly, if Units are purchased after
any Deferred Charge Payment Date, you will not pay charges previously deducted
and this will also have the effect of reducing the aggregate sales charges.
 
                          AGGREGATE SALES CHARGES AS A
   PERCENTAGE OF PUBLIC OFFERING PRICE PER 1,000 UNITS AT SELECTED INTERVALS*
 
<TABLE><CAPTION>

                                                          PUBLIC                                              PUBLIC
                                                      OFFERING PRICE          PUBLIC OFFERING             OFFERING PRICE
                                                          MINUS                  PRICE PER                     PLUS
                                                  ----------------------       1,000 UNITS ON       --------------------------
                                                     $50         $25           APRIL 30, 1997           $25           $50
                                                  ----------  ----------  ------------------------  ------------  ------------
<S>                                               <C>         <C>         <C>                       <C>           <C>
Public Offering Price                             $   953.42  $   978.42       $     1,003.42       $   1,028.42  $   1,053.42
Aggregate Sales Charges                           $    49.41  $    49.73       $        50.04       $      50.35  $      50.66
Aggregate Sales Charges as a percentage of
  Public Offering Price                                 5.18%       5.08%                4.99%              4.90%         4.81%
</TABLE>

 
     To qualify for a reduced sales charge, the dealer must confirm that the
sale is to a single purchaser or is purchased for its own account and not for
distribution. For these purposes, Units held in the name of the purchaser's
spouse or child under 21 years of age are deemed to be purchased by a single
purchaser. A trustee or other fiduciary purchasing securities for a single trust
estate or single fiduciary account is also considered a single purchaser. This
procedure may be amended or terminated at any time without notice.
 
     Employees of certain Sponsors and Sponsor affiliates and non-employee
directors of Merrill Lynch & Co. Inc. may purchase Units at any time at prices
including a sales charge of not less than $5 per 1,000 Units.
 
- ---------------
*These represent the maximum fees and figures assuming that Units were purchased
on the date stated and are held until maturity of the Fund. Sales before the
last Deferred Charge Payment Date will result in less deductions of deferred
sales charges and therefore have the effect of reducing the aggregate sales
charge. The initial sales charge is reduced on purchases of 1,000,000 Units or
more.
 
                                       3
<PAGE>
     The next chart sets forth the estimated maximum dollar amount payable on
account of the deferred sales charge assuming you hold your Units through the
following numbers of maturities of the Securities in the portfolio
(approximately annually), as follows:
 
                     MAXIMUM DOLLAR AMOUNT PER 1,000 UNITS
                  PAYABLE ON ACCOUNT OF DEFERRED SALES CHARGE
 

               CUMULATIVE
                 DEFERRED
                    SALES
 MATURITIES        CHARGE
- -------------  -----------
          1     $    3.75
          2          7.50
          3         11.25
          4         15.00
          5         18.75
          6         22.50
          7         26.25
          8         30.00
          9         33.75
         10         37.50

 
EVALUATIONS
 
     Evaluations are determined by the independent Evaluator on each Business
Day. This excludes Saturdays, Sundays and the following holidays as observed by
the New York Stock Exchange: New Year's Day, Presidents' Day, Good Friday,
Memorial Day, Independence Day, Labor Day, Thanksgiving and Christmas, and the
following Federal holidays: Martin Luther King's Birthday, Columbus Day and
Veterans Day. Securities evaluations are generally determined on the basis of
current bid or offer prices for the Securities or comparable securities or by
appraisal or by any combination of these methods. Under current market
conditions the bid prices for Treasury obligations of the type deposited in the
Portfolio are expected to be approximately .10% less than the offer price.
Neither the Sponsors, the Trustee or the Evaluator will be liable for errors in
the Evaluator's judgment. The fees of the Evaluator will be borne by the Fund.
 
CERTIFICATES
 
     Certificates for Units are issued upon request and may be transferred by
paying any taxes or governmental charges and by complying with the requirements
for redeeming Certificates (see How To Sell Units--Trustee's Redemption of
Units). Certain Sponsors collect additional charges for registering and shipping
Certificates to purchasers. Lost or mutilated Certificates can be replaced upon
delivery of satisfactory indemnity and payment of costs.
 
HOW TO SELL UNITS
 
SPONSORS' MARKET FOR UNITS
 
     You can sell your Units at any time without a fee. The Sponsors (although
not obligated to do so) will normally buy any Units offered for sale at the
repurchase price next computed after receipt of the order. The Sponsors have
maintained secondary markets in Defined Asset Funds for over 20 years. Primarily
because of the sales charge and fluctuations in the market value of the
Securities, the sale price may be less than the cost of your Units. You should
consult your financial professional for current market prices to determine if
other broker-dealers or banks are offering higher prices for Units.
 
     The Sponsors may discontinue this market without prior notice if the supply
of Units exceeds demand or for other business reasons; in that event, the
Sponsors may still purchase Units at the redemption price as a service to
investors. The Sponsors may reoffer or redeem Units repurchased.
 
                                       4
<PAGE>
TRUSTEE'S REDEMPTION OF UNITS
 
     You may redeem your Units by sending the Trustee a redemption request
together with any certificates you hold. Certificates must be properly endorsed
or accompanied by a written transfer instrument with signatures guaranteed by an
eligible institution. In certain instances, additional documents may be required
such as a certificate of death, trust instrument, certificate of corporate
authority or appointment as executor, administrator or guardian. If the Sponsors
are maintaining a market for Units, they will purchase any Units tendered at the
repurchase price described above. The Fund has no back-end load or 12b-1 fees,
so there is never a fee for cashing in your investment (see Appendix A). If they
do not purchase Units tendered, the Trustee is authorized in its discretion to
sell Units in the over-the-counter market if it believes it will obtain a higher
net price for the redeeming investor.
 
     You may request distribution in kind from the Trustee instead of cash
redemption, provided that you are tendering Units with a value of at least
$50,000. By the seventh calendar day after tender, an amount and value of
Securities per Unit, together with a pro rata portion of the cash balance in the
Fund, equal to the Redemption Price per Unit, will be paid over to the Trustee,
as distribution agent, and either held for your account or disposed of in
accordance with your instructions. Any brokerage commissions on sales of
Securities in connection with in-kind redemptions will be borne by you.
 
     Redemptions may be suspended or payment postponed if the New York Stock
Exchange is closed other than for customary weekend and holiday closings, if the
SEC determines that trading on that Exchange is restricted or that an emergency
exists making disposal or evaluation of the Securities not reasonably
practicable, or for any other period permitted by the SEC.
 
INCOME, DISTRIBUTIONS AND REINVESTMENT
 
INCOME
 
     Interest received is credited to an Income Account and other receipts to a
Capital Account. A Reserve Account may be created by withdrawing from the Income
and Capital Accounts amounts considered appropriate by the Trustee to reserve
for any material amount that may be payable out of the Fund.
 
DISTRIBUTIONS AND RETURNS
 
     Each Unit receives an equal share of monthly distributions of interest
income net of estimated expenses. Interest on the Securities is generally
received by the Fund on a semi-annual or annual basis. Because interest on the
Securities is not received at a constant rate throughout the year, any Monthly
Income Distribution may be more or less than the interest actually received. To
eliminate fluctuations in the Monthly Income Distribution, the Trustee will
advance amounts necessary to provide approximately equal interest distributions;
it will be reimbursed, without interest, from interest received on the
Securities, but the Trustee is compensated, in part, by holding the Fund's cash
balances in non-interest bearing accounts. In approximately the next 11 years of
the Fund, all principal from maturing Securities (less an amount necessary to
satisfy the investors' deferred sales charge obligation) will be reinvested in
Extension Securities. Thereafter, as each Security in the Portfolio matures, the
balance in the Capital Account will be distributed on or about the second
business day following the maturity date to investors of record on the business
day immediately preceding the distribution day.
 
     The estimated annual income per Unit, after deducting estimated annual Fund
expenses as stated in Part A of the Prospectus, will change as Securities
mature, are called or sold or otherwise disposed of, as replacement obligations
are deposited and as Fund expenses change. Because the Portfolio is not actively
managed, income distributions will generally not be affected by changes in
interest rates and the amount of income should be substantially maintained as
long as the Portfolio remains unchanged; however, optional redemptions of
Securities or other Portfolio changes may occur more frequently when interest
rates decline, which would result in early returns of principal and possibly
earlier termination of the Fund.
 
ESTIMATED YIELD TO NEXT EXTENSION DATE
 
     Estimated Yield to Next Extension Date shows the net annual yield to
investors from the date of purchase of Units until the Next Extension Date
(i.e., the next date on which approximately 20% of the face value of the
Portfolio matures). Under accepted bond practice, bonds are customarily offered
to investors on a 'yield price'
 
                                       5
<PAGE>
basis, which involves computation of yield to maturity, and which takes into
account not only the interest payable on the bonds but also the amortization or
accretion to a specified date of any premium over or discount from the par
(maturity) value in the bond's purchase price. In calculating Estimated Yield to
Next Extension Date, the average yield for the Portfolio is derived by weighting
each Security's yield by the market value of the Security (but not by the time
remaining to maturity). Once the average Portfolio yield is computed, this
figure is then adjusted for estimated expenses and the effect of the applicable
sales charges paid by investors. The Estimated Yield to Next Extension Date
calculation does not take into account certain delays in distributions of income
and the timing of other receipts and distributions on Units and may, depending
on maturities, overstate or understate the impact of sales charges. All of these
factors may result in a lower figure.
 
     Estimated Yield to Next Extension Date will vary with the purchase price of
the Units (including sales charges), changes in Fund income and expenses and
changes in Portfolio composition (including dispositions and Extensions of
Securities) and the date of purchase of the Units and therefore can be
materially different than any figure quoted. In addition, this figure may not be
directly comparable to yield figures used to measure other investments, and
since it is based on certain assumptions and variables the actual return
received by an investor may be higher or lower.
 
REINVESTMENT
 
     Income distributions on Units may be reinvested by participating in the
Fund's reinvestment plan. Under the plan, the Units acquired for investors will
be either Units already held in investory by the Sponsors or new Units created
by the Sponsors' deposit of additional Securities. Deposits or purchases of
additional Securities will generally be made so as to maintain the then existing
proportionate relationship among the number of shares of each Security in the
Fund. Units acquired by reinvestment will be subject to the applicable Public
Offering Price (less the initial sales charge). The Sponsors reserve the right
to amend, modify or terminate the reinvestment plan at any time without prior
notice. Investors holding Units in 'street name' should contact their broker,
dealer or financial institution if they wish to participate in the reinvestment
plan.
 
FUND EXPENSES
 
     Estimated annual Fund expenses are listed in Part A of the Prospectus; if
actual expenses exceed the estimate, the excess will be borne by the Fund. The
Trustee's annual fee is payable in monthly installments. The Trustee also
benefits when it holds cash for the Fund in non-interest bearing accounts.
Possible additional charges include extraordinary services, costs of
indemnifying the Trustee and the Sponsors, costs of action taken to protect the
Fund and other legal fees and expenses, Fund termination expenses and any
governmental charges. The Trustee has a lien on Fund assets to secure
reimbursement of these amounts and may sell Securities for this purpose if cash
is not available. The Sponsors receive an annual fee currently estimated at
$0.35 per $1,000 face amount of underlying Securities to reimburse them for the
cost of providing Portfolio supervisory services to the Fund. While the fee may
exceed their costs of providing these services to the Fund, the total
supervision fees from all Series of Defined Asset Funds will not exceed their
costs for these services to all of those Series during any calendar year. The
Sponsors may also be reimbursed for their costs of providing bookkeeping and
administrative services to the Fund, currently estimated at $0.10 per 1,000
Units. The Trustee's, Sponsors' and Evaluator's fees may be adjusted for
inflation without Investors' approval.
 
     All of the expenses incurred in establishing the Fund, as well as
advertising and selling expenses, will be paid from the Underwriting Account at
no charge to the Fund. Sales charges on Defined Asset Funds range from under
1.0% to 5.5%. This may be less than you might pay to buy and hold a comparable
managed fund. Defined Asset Funds can be a cost-effective way to purchase and
hold investments. Annual operating expenses are generally lower than for managed
funds. Because Defined Asset Funds have no management fees, limited transaction
costs and no ongoing marketing expenses, operating expenses are generally less
than 0.25% a year. When compounded annually, small differences in expense ratios
can make a big difference in your investment results.
 
TAXES
 
     The following summary describes some of the important income tax
consequences of holding Units, assuming that the investor is not a dealer,
financial institution or insurance company or other investor with special
circumstances. Investors should consult their tax advisers about an investment
in the Fund.
 
                                       6
<PAGE>
TAXATION OF THE FUND
 
     The Fund intends to qualify for and elect the special tax treatment
applicable to 'regulated investment companies' under Sections 851-855 of the
Internal Revenue Code of 1986, as amended (the 'Code'). Qualification and
election as a 'regulated investment company' involve no supervision of
investment policy or management by any government agency. If the Fund qualifies
as a 'regulated investment company' and distributes to investors 90% or more of
its taxable income excluding its net capital gain (i.e., the excess of its net
long-term capital gain over its short-term capital loss), it will not be subject
to federal income tax on the portion of its taxable income (including any net
capital gain) it distributes to investors in a timely manner. In addition, the
Fund will not be subject to the 4% excise tax on certain undistributed income of
'regulated investment companies' to the extent it distributes to investors in a
timely manner at least 98% of its taxable income (including any net capital
gain). It is anticipated that the Fund will not be subject to federal income tax
or the excise tax because the Indenture requires the distribution of the Fund's
taxable income (including any net capital gain) in a timely manner. Although all
or a portion of the Fund's taxable income (including any net capital gain) for a
calendar year may be distributed shortly after the end of the calendar year,
such a distribution will be treated for federal income tax purposes as having
been received by investors during the calendar year.
 
DISTRIBUTIONS
 
     Distributions to investors of the Fund's interest income, gain that is
treated as ordinary income under the market discount rules and net short-term
capital gain in any year will generally be taxable as ordinary income to
investors to the extent of the Fund's taxable income (other than taxable income
attributable to its net capital gain) for that year. Distributions in excess of
the Fund's taxable income will be treated as a return of capital and will reduce
the investor's basis in his Units and, to the extent that such distributions
exceed his basis, will be treated as a gain from the sale of his Units as
discussed below. It is anticipated that substantially all of the distributions
of the Fund's net capital gains will be designated as capital gain dividends and
that the Fund's interest income, ordinary gain and net short-term capital gain
will be taxable as ordinary income to investors. Distributions that are taxable
as ordinary income to investors will constitute dividends for federal income tax
purposes but will not be eligible for the dividends-received deduction for
corporations.
 
     Distributions of the Fund's net capital gain that are designated as capital
gain dividends by the Fund will be taxable to investors as long-term capital
gain, regardless of the time the investor has held his Units. However, if the
Fund were to terminate in less than one year, the Fund would not distribute any
capital gain dividends. The Internal Revenue Service has issued a notice (with
interim guidance) of forthcoming temporary regulations to permit a regulated
investment company such as the Fund to designate its dividends, subject to
certain limitations, as 20% or 28% rate gain distributions, which individual
investors may be entitled to treat as long-term capital gain in the 20% to 28%
groups respectively. The Trustee will provide necessary additional information
with periodic statements to investors, who should consult their tax advisers
regarding these matters.
 
     An investor, other than a dealer in securities, will generally recognize
capital gain or loss when the investor disposes of his Units (by sale,
redemption or otherwise). In the case of a distribution of Securities to an
investor upon redemption of his Units, gain or loss will generally be recognized
in an amount equal to the difference between the investor's tax basis in his
Units and the fair market value of the Securities received in redemption. Net
capital gain may be taxed at a lower rate than ordinary income for certain
non-corporate investors, and non-corporate investors who have held their Units
for more than 18 months may be entitled to a 20% maximum federal tax rate for
gains from the sale of these Units. Any such capital gain or loss is long-term
if the asset is held for more than one year and short-term if held one year or
less. However, any capital loss on the sale or redemption of a Unit that an
investor has held for six months or less will be a long-term capital loss to the
extent of any long-term capital gain dividends previously distributed to the
investor by the Fund, although the proper treatment of this long-term capital
loss remains uncertain pending further consideration by the Internal Revenue
Service. The deduction of capital loss is subject to limitations. Investors
should consult their own tax advisers regarding these matters.
 
     Payments of principal on underlying mortgages or sales of Securities by the
Fund (to meet redemptions or otherwise) may give rise to gain (including market
discount) to the Fund. The amount of gain will be based upon the cost of the
Security to the Fund and will be without regard to the value of the Security
when a particular investor purchases his Units. Since distributions of this gain
do not generally reduce an investor's tax basis in his
 
                                       7
<PAGE>
Units, an investor may have a corresponding capital loss (or a reduced amount of
gain) on a subsequent sale or redemption of his Units.
 
     Investors will be taxed in the manner described above regardless of whether
distributions from the Fund are actually paid to the investor or are
automatically reinvested. The federal tax status of each year's distributions
will be reported to investors and to the Internal Revenue Service. The Fund
intends to report to each investor, no later than January 31, the amount of
distributions to that investor.
 
     The foregoing discussion relates only to the federal income tax status of
the Fund and to the tax treatment of distributions by the Fund to U.S.
investors. Investors who are not U.S. citizens or residents should be aware that
distributions from the Fund (other than capital gain dividends) generally will
be subject to a withholding tax of 30% or a lower treaty rate. Because interest
income of the type received by the Fund would generally not be subject to
withholding if received directly by the foreign investor, an investment in the
Fund is likely to be appropriate for a foreign investor only when that foreign
investor can utilize a foreign tax credit or corresponding benefit in respect of
such withholding taxes. Foreign investors should consult their own tax advisers
to determine whether investment in the Fund is appropriate. Distributions may
also be subject to state and local taxation and investors should consult their
own tax advisers in this regard.
 
RETIREMENT PLANS
 
     This Series of Government Securities Income Fund may be suited for purchase
by Individual Retirement Accounts ('IRAs'), Keogh plans, pension funds and other
qualified retirement plans, certain of which are briefly described below.
Generally, capital gains and income received in each of the foregoing plans are
exempt from Federal taxation. All distributions from such plans are generally
treated as ordinary income but may, in some cases, be eligible for special 5 or
10 year averaging (prior to the year 2000) or tax-deferred rollover treatment.
Investors in IRAs, Keogh plans and other tax-deferred retirement plans should
consult their plan custodian as to the appropriate disposition of distributions.
Investors considering participation in any of these plans should review specific
tax laws related thereto and should consult their attorneys or tax advisors with
respect to the establishment and maintenance of any of these plans. These plans
are offered by brokerage firms, including the Sponsors of this Fund, and other
financial institutions. Fees and charges with respect to such plans may vary.
 
     Retirement Plans for the Self-Employed--Keogh Plans. Units of the Fund may
be purchased by retirement plans established for self-employed individuals,
partnerships or unincorporated companies ('Keogh plans'). The assets of a Keogh
plan must be held in a qualified trust or other arrangement which meets the
requirements of the Code. Keogh plan participants may also establish separate
IRAs (see below) to which they may contribute up to an additional $2,000 per
year ($4,000 in a spousal account).
 
     Individual Retirement Account--IRA. Any individual can make use of a
qualified IRA arrangement for the purchase of Units of the Fund. Any individual
(including one covered by an employer retirement plan) can make a contribution
to an IRA equal to the lesser of $2,000 ($4,000 in a spousal account) or 100% of
earned income; such investment must be made in cash. However, the deductible
amount of a contribution by an individual covered by an employer retirement plan
will be reduced if the individual's adjusted gross income exceeds $25,000 (in
the case of a single individual), $40,000 (in the case of a married individual
filing a joint return) or $200 (in the case of a married individual filing a
separate return). These income threshholds will gradually be increased by 2004
to $50,000 for a single individual and $80,000 for a married individual filing
jointly. Certain transactions which are prohibited under Section 408 of the Code
will cause all or a portion of the amount in an IRA to be deemed to be
distributed and subject to tax at that time. Unless nondeductible contributions
were made in 1987 or a later year, all distributions from an IRA will be treated
as ordinary income but generally are eligible for tax-deferred rollover
treatment. Taxable distributions made before attainment of age 59 1/2, except in
the case of the participant's death or disability or where the amount
distributed is part of a series of substantially equal periodic (at least
annual) payments that are to be made over the life expectancies of the
participant and his or her beneficiary, are generally subject to a surtax in an
amount equal to 10% of the distribution. The 10% surtax will be waived for
withdrawals for certain educational and first-time homebuyer expenses. The
Taxpayer Relief Act of 1997 provides, subject to certain income limitations, for
a special type of IRA under which contributions would be non-deductible but
distributions would be tax-free if the account were held for at least five years
and the account holder was at least 59 1/2 at the time of distribution.
 
                                       8
<PAGE>
     Corporate Pension and Profit-Sharing Plans. A pension or profit-sharing
plan for employees of a corporation may purchase Units of the Fund.
 
RECORDS AND REPORTS
 
     The Trustee keeps a register of the names, addresses and holdings of all
investors. The Trustee also keeps records of the transactions of the Fund,
including a current list of the Securities and a copy of the Indenture, and
supplemental information on the operations of the Fund and the risks associated
with the Securities held by the Fund, which may be inspected by investors at
reasonable times during business hours.
 
     With each distribution, the Trustee includes a statement of the interest
and any other receipts being distributed. Within five days after deposit of
Securities in exchange or substitution for Securities (or contracts) previously
deposited, the Trustee will send a notice to each investor, identifying both the
Securities removed and the replacement Securities deposited. The Trustee sends
each investor of record an annual report summarizing transactions in the Fund's
accounts and amounts distributed during the year and Securities held, the number
of Units outstanding and the Redemption Price at year end, the interest received
by the Fund on the Securities, the cash proceeds received by the Fund from the
disposition of any Security (resulting from redemption or payment at maturity or
sale of any Security), and the fees and expenses paid by the Fund, among other
matters. The Trustee will also furnish annual information returns to each
investor. Investors may obtain copies of Security evaluations from the Trustee
to enable them to comply with federal and state tax reporting requirements. Fund
accounts are audited annually by independent accountants selected by the
Sponsors. Audited financial statements are available from the Trustee on
request.
 
TRUST INDENTURE
 
     The Fund is a 'unit investment trust' created under New York law by a Trust
Indenture among the Sponsors, the Trustee and the Evaluator. This Prospectus
summarizes various provisions of the Indenture, but each statement is qualified
in its entirety by reference to the Indenture.
 
     The Indenture may be amended by the Sponsors and the Trustee without
consent by investors to cure ambiguities or to correct or supplement any
defective or inconsistent provision, to make any amendment required by the SEC
or other governmental agency or to make any other change not materially adverse
to the interest of investors (as determined in good faith by the Sponsors). The
Indenture may also generally be amended upon consent of investors holding 51% of
the Units. No amendment may reduce the interest of any investor in the Fund
without the investor's consent or reduce the percentage of Units required to
consent to any amendment without unanimous consent of investors. Investors will
be notified on the substance of any amendment.
 
     The Trustee may resign upon notice to the Sponsors. It may be removed by
investors holding 51% of the Units at any time or by the Sponsors without the
consent of investors if it becomes incapable of acting or bankrupt, its affairs
are taken over by public authorities, or if under certain conditions the
Sponsors determine in good faith that its replacement is in the best interest of
the investors. The Evaluator may resign or be removed by the Sponsors and the
Trustee without the investors' consent. The resignation or removal of either
becomes effective upon acceptance of appointment by a successor; in this case,
the Sponsors will use their best efforts to appoint a successor promptly;
however, if upon resignation no successor has accepted appointment within 30
days after notification, the resigning Trustee or Evaluator may apply to a court
of competent jurisdiction to appoint a successor.
 
     Any Sponsor may resign so long as one Sponsor with a net worth of
$2,000,000 remains and is agreeable to the resignation. A new Sponsor may be
appointed by the remaining Sponsors and the Trustee to assume the duties of the
resigning Sponsor. If there is only one Sponsor and it fails to perform its
duties or becomes incapable of acting or bankrupt or its affairs are taken over
by public authorities, the Trustee may appoint a successor Sponsor at reasonable
rates of compensation, terminate the Indenture and liquidate the Fund or
continue to act as Trustee without a Sponsor. Merrill Lynch, Pierce, Fenner &
Smith Incorporated has been appointed as Agent for the Sponsors by the other
Sponsors.
 
     The Sponsors, the Trustee and the Evaluator are not liable to investors or
any other party for any act or omission in the conduct of their responsibilities
absent bad faith, willful misfeasance, negligence (gross negligence in the case
of a Sponsor or the Evaluator) or reckless disregard of duty. The Indenture
contains customary provisions limiting the liability of the Trustee.
 
                                       9
<PAGE>
MISCELLANEOUS
 
LEGAL OPINION
 
     The legality of the Units has been passed upon by Davis Polk & Wardwell,
450 Lexington Avenue, New York, New York 10017, as special counsel for the
Sponsors.
 
AUDITORS
 
     The Statement of Condition in Part A of the Prospectus was audited by
Deloitte & Touche LLP, independent accountants, as stated in their opinion. It
is included in reliance upon that opinion given on the authority of that firm as
experts in accounting and auditing.
 
TRUSTEE
 
     The Trustee and its address are stated on the back cover of the Prospectus.
The Trustee is subject to supervision by the Federal Deposit Insurance
Corporation, the Board of Governors of the Federal Reserve System and New York
State banking authorities.
 
SPONSORS
 
     The Sponsors are listed on the back cover of the Prospectus. They may
include Merrill Lynch, Pierce, Fenner & Smith Incorporated, a wholly-owned
subsidiary of Merrill Lynch & Co., Inc.; Smith Barney Inc., an indirect
wholly-owned subsidiary of The Travelers Inc.; Prudential Securities
Incorporated, an indirect wholly-owned subsidiary of the Prudential Insurance
Company of America; Dean Witter Reynolds, Inc., a principal operating subsidiary
of Morgan Stanley, Dean Witter, Discover & Co. and PaineWebber Incorporated, a
wholly-owned subsidiary of PaineWebber Group Inc. Each Sponsor, or one of its
predecessor corporations, has acted as Sponsor of a number of series of unit
investment trusts. Each Sponsor has acted as principal underwriter and managing
underwriter of other investment companies. The Sponsors, in addition to
participating as members of various selling groups or as agents of other
investment companies, execute orders on behalf of investment companies for the
purchase and sale of securities of these companies and sell securities to these
companies in their capacities as brokers or dealers in securities.
 
CODE OF ETHICS
 
     The Agent for the Sponsors has adopted a code of ethics requiring
preclearance and reporting of personal securities transactions by its personnel
who have access to information on Defined Asset Funds portfolio transactions.
The code is intended to prevent any act, practice or course of conduct which
would operate as a fraud or deceit on any Fund and to provide guidance to these
persons regarding standards of conduct consistent with the Agent's
responsibilities to the Defined Asset Funds.
 
YEAR 2000 ISSUES
 
     Many computer systems were designed using only two digits to designate
years. These systems may not be able to distinguish the Year 2000 from the Year
1900 (commonly known as the 'Year 2000 Problem'). Like other investment
companies and financial and business organizations, the Fund could be adversely
affected if the computer systems used by the Agent for the Sponsors or Fund
service providers do not properly address this problem prior to January 1, 2000.
The Agent for the Sponsors has established a dedicated group to analyze these
issues and to implement any systems modifications necessary to prepare for the
Year 2000. Currently, we do not anticipate that the transition to the 21st
century will have any material effect on the Fund. The Agent for the Sponsors
has sought assurances from the Fund's other service providers that they are
taking all necessary steps to ensure that their computer systems will accurately
reflect the Year 2000, and the Agent for the Sponsors will continue to monitor
the situation. At this time, however, no assurance can be given that the Fund's
other service providers have anticipated every step necessary to avoid any
adverse effect on the Fund attributable to the Year 2000 Problem.
 
PUBLIC DISTRIBUTION
 
     In the initial offering period Units will be distributed to the public
through the Underwriting Account and dealers who are members of the National
Association of Securities Dealers, Inc. The Sponsors intend to continue
 
                                       10
<PAGE>
to qualify Units for sale in all states in which qualification is deemed
necessary through the Underwriting Account and by dealers who are members of the
National Association of Securities Dealers, Inc. The Sponsors do not intend to
qualify Units for sale in any foreign countries and this Prospectus does not
constitute an offer to sell Units in any country where Units cannot lawfully be
sold. Sales to dealers and to introducing dealers, if any, will initially be
made at prices which represent a concession from the Public Offering Price, but
the Agent for the Sponsors reserves the right to change the rate of any
concession from time to time. Any dealer or introducing dealer may reallow a
concession up to the concession to dealers.
 
UNDERWRITERS' AND SPONSORS' PROFITS
 
     Upon sale of the Units, the Underwriters will be entitled to receive sales
charges; each Underwriter's interest in the Underwriting Account will depend
upon the number of Units acquired through the issuance of additional Units. The
Sponsors also realize a profit or loss on deposit of the Securities equal to the
difference between the cost of the Securities to the Fund (based on the offer
side evaluation on the initial date of deposit) and the Sponsors' cost of the
Securities. During the initial offering period, the Underwriting Account also
may realize profits or sustain losses as a result of fluctuations after the
initial date of deposit in the Public Offering Price of the Units. In
maintaining a secondary market for Units, the Sponsors will also realize profits
or sustain losses in the amount of any difference between the prices at which
they buy Units and the prices at which they resell these Units (which include
the sales charge) or the prices at which they redeem the Units. Cash, if any,
made available by buyers of Units to the Sponsors prior to a settlement date for
the purchase of Units may be used in the Sponsors' businesses to the extent
permitted by Rule 15c3-3 under the Securities Exchange Act of 1934 and may be of
benefit to the Sponsors.
 
FUND PERFORMANCE
 
     Information on the performance of the Fund for various periods, on the
basis of changes in Unit price plus the amount of income and principal
distributions reinvested, may be included from time to time in advertisements,
sales literature, reports and other information furnished to current or
prospective investors. Total return figures are not averaged, and may not
reflect deduction of the sales charge, which would decrease the return. Average
annualized return figures reflect deduction of the maximum sales charge. No
provision is made for any income taxes payable.
 
     Past performance may not be indicative of future results. The Fund is not
actively managed. Unit price and return fluctuate with the value of the
Securities in the Portfolio, so there may be a gain or loss when Units are sold.
 
     Fund performance may be compared to performance data from publications such
as Donoghue's Money Fund Report, Lehman Brothers Intermediate Treasury Bond
Index, Lipper Analytical Services, Inc., Morningstar Publications, Inc., Money
Magazine, The New York Times, U.S. News and World Report, Barron's, Business
Week, CDA Investment Technology, Inc., Forbes Magazine or Fortune Magazine. As
with other performance data, performance comparisons should not be considered
representative of the Fund's relative performance for any future period.
 
DEFINED ASSET FUNDS
 
     For decades informed investors have purchased unit investment trusts for
dependability and professional selection of investments. Defined Asset Funds'
philosophy is to allow investors to 'buy with knowledge' (because, unlike
managed funds, the portfolio of bonds and the return are relatively fixed) and
'hold with confidence' (because the portfolio is professionally selected and
regularly reviewed). Defined Asset Funds offers an array of simple and
convenient investment choices, suited to fit a wide variety of personal
financial goals--a buy and hold strategy for capital accumulation, such as for
children's education or retirement, or attractive, regular current income
consistent with the preservation of principal. Unit investment trusts are
particularly suited for the many investors who prefer to seek long-term income
by purchasing sound investments and holding them, rather than through active
trading. Few individuals have the knowledge, resources or capital to buy and
hold a diversified portfolio on their own; it would generally take a
considerable sum of money to obtain the breadth and diversity that Defined Asset
Funds offer. One's investment objectives may call for a combination of Defined
Asset Funds.
 
     One of the most important investment decisions you face may be how to
allocate your investments among asset classes. Diversification among different
kinds of investments can balance the risks and rewards of each one. Most
investment experts recommend stocks for long-term capital growth. Long-term
corporate bonds offer relatively high rates of interest income. By purchasing
both defined equity and defined bond funds, investors can
 
                                       11
<PAGE>
receive attractive current income, as well as growth potential, offering some
protection against inflation. From time to time various advertisements, sales
literature, reports and other information furnished to current or prospective
investors may present the average annual compounded rate of return of selected
asset classes over various periods of time, compared to the rate of inflation
over the same periods.
 
SUPPLEMENTAL INFORMATION
 
     Upon writing or calling the Trustee shown on the back cover of this
Prospectus, investors will receive at no cost to the investor supplemental
information about the Fund, which has been filed with the SEC. The supplemental
information includes more detailed risk factor disclosure about the types of
Securities that may be part of the Fund's Portfolio and general information
about the structure and operation of the Fund.
 
                                       12
<PAGE>
                                   APPENDIX A
                     INITIAL OFFERING SALES CHARGE SCHEDULE
 
<TABLE><CAPTION>

                                                                    SALES CHARGE
                                                     (GROSS UNDERWRITING PROFIT)
                                                   ----------------------------------
                                                   AS A PERCENT OF      AS PERCENT OF  DEALER CONCESSION AS   PRIMARY MARKET
                                                   OFFER SIDE PUBLIC     NET AMOUNT    PERCENT OF PUBLIC       CONCESSION TO
                 AMOUNT INVESTED                   OFFERING PRICE          INVESTED     OFFERING PRICE        INTRODUCING DEALERS
- -------------------------------------------------  -------------------  -------------  ---------------------  -------------------
<S>                                                <C>                  <C>            <C>                    <C>
Less than $1,000,000.............................            1.25%            1.266%             0.813%            $    9.00
$1,000,000 to $4,999,999.........................            1.00             1.010              0.650                  7.20
$5,000,000 or more...............................             .75              .756              0.490                  5.40
</TABLE>

 
                     SECONDARY MARKET SALES CHARGE SCHEDULE
 
<TABLE><CAPTION>

                                                                                         SALES CHARGE
                                                                          (GROSS UNDERWRITING PROFIT)
                                                                    --------------------------------------
                                                                    AS A PERCENT OF      AS PERCENT OF      DEALER CONCESSION AS
                                                                    BID SIDE PUBLIC         NET AMOUNT      PERCENT OF PUBLIC
                         NUMBER OF UNITS                            OFFERING PRICE            INVESTED       OFFERING PRICE
- ------------------------------------------------------------------  -------------------  -----------------  --------------------
<S>                                                                 <C>                  <C>                <C>
Less than 1,000,000...............................................            1.50%              1.523%               0.975%
1,000,000 to 4,999,999............................................            1.00               1.010                0.650
5,000,000 or more.................................................             .75                .756                0.490
</TABLE>

 
                                      a-1
<PAGE>
                             Defined
                             Asset FundsSM
 

SPONSORS:                               GOVERNMENT SECURITIES
Merrill Lynch,                          INCOME FUND
Pierce, Fenner & Smith Incorporated     U.S. Treasury Strategy TrustSM--1
Defined Asset Funds                     (A Unit Investment Trust)
P.O. Box 9051                           This Prospectus does not contain all of
Princeton, NJ 08543-9051                the information with respect to the
(609) 282-8500                          investment company set forth in its
Smith Barney Inc.                       registration statement and exhibits
Unit Trust Department                   relating thereto which have been filed
388 Greenwich Street--23rd Floor        with the Securities and Exchange
New York, NY 10013                      Commission, Washington, D.C. under the
(212) 816 4000                          Securities Act of 1933 and the
PaineWebber Incorporated                Investment Company Act of 1940, and to
1200 Harbor Boulevard                   which reference is hereby made. Copies
Weehawken, NJ 07087                     of filed material can be obtained from
(201) 902-3000                          the Public Reference Section of the
Prudential Securities Incorporated      Commission, 450 Fifth Street, N.W.,
One New York Plaza                      Washington, D.C. 20549 at prescribed
New York, NY 10292                      rates. The Commission also maintains a
(212) 778-6164                          Web site that contains information
Dean Witter Reynolds Inc.               statements and other information
Two World Trade Center--59th Floor      regarding registrants such as Defined
New York, NY 10048                      Asset Funds that file electronically
(212) 392-2222                          with the Commission at
EVALUATOR:                              http://www.sec.gov.
Interactive Data Services               ------------------------------
14 Wall Street                          No person is authorized to give any
New York, NY 10005                      information or to make any
TRUSTEE:                                representations with respect to this
The Chase Manhattan Bank                investment company not contained in its
Customer Service Retail Department      registration statement and exhibits
Bowling Green Station                   related thereto; and any information or
P.O. Box 5187                           representation not contained therein
New York, NY 10274-5187                 must not be relied upon as having been
1-800-323-1508                          authorized.
                                        ------------------------------
                                        When Units of this Fund are no longer
                                        available this Prospectus may be used as
                                        a preliminary prospectus for a future
                                        series, and investors should note the
                                        following:
                                        Information contained herein is subject
                                        to amendment. A registration statement
                                        relating to securities of a future
                                        series 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.

 
                                                      14493--7/98
 

<PAGE>
                             DEFINED ASSET FUNDS--
                       GOVERNMENT SECURITIES INCOME FUND
                       CONTENTS OF REGISTRATION STATEMENT
 
     This Post-Effective Amendment to the Registration Statement on Form S-6
comprises the following papers and documents:
 
     The facing sheet of Form S-6.
 
     The cross-reference sheet (incorporated by reference to the Registration
Statement on Form S-6 of Defined Asset Funds Municipal Insured Series, 1933 Act
File No. 33-54565).
 
     The Prospectus including Part B incorporated by reference, Defined Asset
Funds--Government Securities Income Fund, GNMA Series--3, 1933 Act File No.
33-10366.
 
     The Signatures.
 
     The following exhibits:
 
        1.1.1--Form of Standard Terms and Conditions of Trust Effective as of
     October 21, 1993 (incorporated by reference to Exhibit 1.1.1 to the
     Registration Statement of Municipal Investment Trust Fund, Multistate
     Series--48, 1933 Act File No. 33-50247).
 
        4.1  --Consent of the Evaluator.
 
        5.1  --Consent of independent accountants.
 
        9.1  --Information Supplement (incorporated by reference to Exhibit 9.1
               to Post-Effective Amendment No. 1 to the Registration Statement
               of Government Securities Income Fund Freddie Mac Series--12, 1933
               Act File No. 33-56849).
 
                                      R-1
<PAGE>
                             DEFINED ASSET FUNDS--
                       GOVERNMENT SECURITIES INCOME FUND
                        U.S. TREASURY STRATEGY TRUST--1
 
                                   SIGNATURES
 
     PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE REGISTRANT,
DEFINED ASSET FUNDS--GOVERNMENT SECURITIES INCOME FUND, U.S. TREASURY STRATEGY
TRUST--1 (A UNIT INVESTMENT TRUST), CERTIFIES THAT IT MEETS ALL OF THE
REQUIREMENTS FOR EFFECTIVENESS OF THIS REGISTRATION STATEMENT PURSUANT TO RULE
485(B) UNDER THE SECURITIES ACT OF 1933 AND HAS DULY CAUSED THIS REGISTRATION
STATEMENT OR AMENDMENT TO THE REGISTRATION STATEMENT TO BE SIGNED ON ITS BEHALF
BY THE UNDERSIGNED THEREUNTO DULY AUTHORIZED IN THE CITY OF NEW YORK AND STATE
OF NEW YORK ON THE 22ND DAY OF JULY, 1998.
 
             SIGNATURES APPEAR ON PAGES R-3, R-4, R-5, R-6 AND R-7.
 
     A majority of the members of the Board of Directors of Merrill Lynch,
Pierce, Fenner & Smith Incorporated has signed this Registration Statement or
Amendment to the Registration Statement pursuant to Powers of Attorney
authorizing the person signing this Registration Statement or Amendment to the
Registration Statement to do so on behalf of such members.
 
     A majority of the members of the Board of Directors of Smith Barney Inc.
has signed this Registration Statement or Amendment to the Registration
Statement pursuant to Powers of Attorney authorizing the person signing this
Registration Statement or Amendment to the Registration Statement to do so on
behalf of such members.
 
     A majority of the members of the Executive Committee of the Board of
Directors of PaineWebber Incorporated has signed this Registration Statement or
Amendment to the Registration Statement pursuant to Powers of Attorney
authorizing the person signing this Registration Statement or Amendment to the
Registration Statement to do so on behalf of such members.
 
     A majority of the members of the Board of Directors of Prudential
Securities Incorporated has signed this Registration Statement or Amendment to
the Registration Statement pursuant to Powers of Attorney authorizing the person
signing this Registration Statement or Amendment to the Registration Statement
to do so on behalf of such members.
 
     A majority of the members of the Board of Directors of Dean Witter Reynolds
Inc. has signed this Registration Statement or Amendment to the Registration
Statement pursuant to Powers of Attorney authorizing the person signing this
Registration Statement or Amendment to the Registration Statement to do so on
behalf of such members.
 
                                      R-2
<PAGE>
               MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
                                   DEPOSITOR
 

By the following persons, who constitute a majority of      Powers of Attorney
  the Board of Directors of Merrill Lynch, Pierce,            have been filed
  Fenner & Smith Incorporated:                                under
                                                              Form SE and the
                                                              following 1933 Act
                                                              File
                                                              Number: 33-43466
                                                              and 33-51607

 
      HERBERT M. ALLISON, JR.
      BARRY S. FREIDBERG
      EDWARD L. GOLDBERG
      STEPHEN L. HAMMERMAN
      JEROME P. KENNEY
      DAVID H. KOMANSKY
      DANIEL T. NAPOLI
      THOMAS H. PATRICK
      JOHN L. STEFFENS
      ROGER M. VASEY
      ARTHUR H. ZEIKEL
      By DANIEL C. TYLER
       (As authorized signatory for Merrill Lynch, Pierce,
       Fenner & Smith Incorporated and
       Attorney-in-fact for the persons listed above)
 
                                      R-3
<PAGE>
                       PRUDENTIAL SECURITIES INCORPORATED
                                   DEPOSITOR
 

By the following persons, who constitute a majority of      Powers of Attorney
  the Board of Directors of Prudential Securities             have been filed
  Incorporated:                                               under Form SE and
                                                              the following 1933
                                                              Act File Numbers:
                                                              33-41631 and
                                                              333-15919

 
      ROBERT C. GOLDEN
      ALAN D. HOGAN
      A. LAURENCE NORTON, JR.
      LELAND B. PATON
      VINCENT T. PICA II
      MARTIN PFINSGRAFF
      HARDWICK SIMMONS
      LEE B. SPENCER, JR.
      BRIAN M. STORMS
 
      By RICHARD R. HOFFMANN
       (As authorized signatory for Prudential Securities
       Incorporated and Attorney-in-fact for the persons
       listed above)
 
                                      R-4
<PAGE>
                               SMITH BARNEY INC.
                                   DEPOSITOR
 

By the following persons, who constitute a majority of      Powers of Attorney
  the Board of Directors of Smith Barney Inc.:                have been filed
                                                              under the 1933 Act
                                                              File Numbers:
                                                              33-49753, 33-55073
                                                              and 333-10441

 
      JAMES DIMON
      DERYCK C. MAUGHAN
 
      By GINA LEMON
       (As authorized signatory for
       Smith Barney Inc. and
       Attorney-in-fact for the persons listed above)
 
                                      R-5
<PAGE>
                           DEAN WITTER REYNOLDS INC.
                                   DEPOSITOR
 

By the following persons, who constitute  Powers of Attorney have been filed
  a majority of                             under Form SE and the following 1933
  the Board of Directors of Dean Witter     Act File Numbers: 33-17085 and
  Reynolds Inc.:                            333-13039

 
      RICHARD M. DeMARTINI
      ROBERT J. DWYER
      CHRISTINE A. EDWARDS
      CHARLES A. FIUMEFREDDO
      JAMES F. HIGGINS
      MITCHELL M. MERIN
      STEPHEN R. MILLER
      RICHARD F. POWERS III
      PHILIP J. PURCELL
      THOMAS C. SCHNEIDER
      WILLIAM B. SMITH
      By
       MICHAEL D. BROWNE
       (As authorized signatory for
       Dean Witter Reynolds Inc.
       and Attorney-in-fact for the persons listed above)
 
                                      R-6
<PAGE>
                            PAINEWEBBER INCORPORATED
                                   DEPOSITOR
 

By the following persons, who constitute  Powers of Attorney have been filed
  the Board of Directors of PaineWebber     under
  Incorporated:                             the following 1933 Act File
                                            Number: 2-61279

 
      MARGO N. ALEXANDER
      TERRY L. ATKINSON
      BRIAN M. BAREFOOT
      STEVEN P. BAUM
      MICHAEL CULP
      REGINA A. DOLAN
      JOSEPH J. GRANO, JR.
      EDWARD M. KERSCHNER
      JAMES P. MacGILVRAY
      DONALD B. MARRON
      ROBERT H. SILVER
      MARK B. SUTTON
      By
       ROBERT E. HOLLEY
       (As authorized signatory for
       PaineWebber Incorporated
       and Attorney-in-fact for the persons listed above)
 
                                      R-7


<PAGE>
                                                                     EXHIBIT 4.1
 
                                INTERACTIVE DATA
                          FINANCIAL TIMES INFORMATION
                           14 WALL STREET, 11th FLOOR
                            NEW YORK, NEW YORK 10005
                                 (212) 306-6596
                                FAX 212-306-6698
 
                                                   July 22, 1998
 

Merrill Lynch, Pierce, Fenner & Smith
Incorporated
Defined Asset Funds
P.O. Box 9051
Princeton, New Jersey 08543-9051
The Chase Manhattan Bank
4 New York Plaza, 6th Floor
New York, New York 10004

 
RE: DEFINED ASSET FUNDS--GOVERNMENT SECURITIES INCOME FUND,
     U.S. TREASURY STRATEGY TRUST SERIES--1
 
Gentlemen:
 
     We have examined the post-effective Amendment to the Registration Statement
File No. 33-48915 for the above-captioned trust. We hereby acknowledge that
Kenny S&P Evaluation Services, a division of J. J. Kenny Co., Inc. is currently
acting as the evaluator for the trust. We hereby consent to the use in the
Amendment of the reference to Kenny S&P Evaluation Services, a division of J. J.
Kenny Co., Inc. as evaluator.
 
     You are hereby authorized to file copies of this letter with the Securities
and Exchange Commission.
 
                                                   Sincerely,
                                                   JAMES PERRY
                                                   Vice President

<PAGE>
                                                                     Exhibit 5.1
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
The Sponsors and Trustee
of Defined Asset Funds--Government Securities Income Fund, U.S. Treasury
Strategy Trust--1
 
We consent to the use in Post-Effective Amendment No. 4 to Registration
Statement No. 33-48915 of our opinion dated June 14, 1998 appearing in the
Prospectus, which is part of such Registration Statement, and to the reference
to us under the heading 'Auditors' in such Prospectus.
 
DELOITTE & TOUCHE LLP
New York, N.Y.
July 22, 1998

<TABLE> <S> <C>

<ARTICLE> 6
<MULTIPLIER>                       1
       
<S>
<PERIOD-TYPE>                      YEAR
<FISCAL-YEAR-END>                  APR-30-1998
<PERIOD-END>                       APR-30-1998
<INVESTMENTS-AT-COST>              118,050,584
<INVESTMENTS-AT-VALUE>             119,021,847
<RECEIVABLES>                      1,270,131
<ASSETS-OTHER>                     0
<OTHER-ITEMS-ASSETS>               0
<TOTAL-ASSETS>                     120,291,978
<PAYABLE-FOR-SECURITIES>           0
<SENIOR-LONG-TERM-DEBT>            0
<OTHER-ITEMS-LIABILITIES>          (835,150)
<TOTAL-LIABILITIES>                (835,150)
<SENIOR-EQUITY>                    0
<PAID-IN-CAPITAL-COMMON>           118,054,134  
<SHARES-COMMON-STOCK>              120,248,684
<SHARES-COMMON-PRIOR>              106,020,611
<ACCUMULATED-NII-CURRENT>          431,431
<OVERDISTRIBUTION-NII>             0
<ACCUMULATED-NET-GAINS>            0
<OVERDISTRIBUTION-GAINS>           0
<ACCUM-APPREC-OR-DEPREC>           971,263
<NET-ASSETS>                       119,456,828  
<DIVIDEND-INCOME>                  0
<INTEREST-INCOME>                  7,230,871
<OTHER-INCOME>                     0
<EXPENSES-NET>                     (156,012)
<NET-INVESTMENT-INCOME>            7,074,859
<REALIZED-GAINS-CURRENT>           581,339
<APPREC-INCREASE-CURRENT>          754,842
<NET-CHANGE-FROM-OPS>              8,411,040
<EQUALIZATION>                     0
<DISTRIBUTIONS-OF-INCOME>          (6,978,858)
<DISTRIBUTIONS-OF-GAINS>           0
<DISTRIBUTIONS-OTHER>              (279,233)
<NUMBER-OF-SHARES-SOLD>            35,978,331
<NUMBER-OF-SHARES-REDEEMED>        21,750,258
<SHARES-REINVESTED>                0
<NET-CHANGE-IN-ASSETS>             14,218,968
<ACCUMULATED-NII-PRIOR>            371,483
<ACCUMULATED-GAINS-PRIOR>          0
<OVERDISTRIB-NII-PRIOR>            0
<OVERDIST-NET-GAINS-PRIOR>         0
<GROSS-ADVISORY-FEES>              0
<INTEREST-EXPENSE>                 0
<GROSS-EXPENSE>                    0
<AVERAGE-NET-ASSETS>               0
<PER-SHARE-NAV-BEGIN>              0
<PER-SHARE-NII>                    0
<PER-SHARE-GAIN-APPREC>            0
<PER-SHARE-DIVIDEND>               0
<PER-SHARE-DISTRIBUTIONS>          0
<RETURNS-OF-CAPITAL>               0
<PER-SHARE-NAV-END>                0
<EXPENSE-RATIO>                    0
<AVG-DEBT-OUTSTANDING>             0
<AVG-DEBT-PER-SHARE>               0
        

</TABLE>


<PAGE>
                             DAVIS POLK & WARDWELL
                              450 LEXINGTON AVENUE
                           NEW YORK, NEW YORK  10017
                                 (212) 450-4000


                                                                July 22, 1998


Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C.  20549

Dear Sirs:

        We hereby represent that the Post-Effective Amendments to the registered
unit investment trusts described in Exhibit A attached hereto do not contain
disclosures which would render them ineligible to become effective pursuant to
Rule 485(b) under the Securities Act of 1933.

                                                        Very truly yours,

                                                        Davis Polk & Wardwell

Attachment

<PAGE>

                                   EXHIBIT A
<TABLE>
<CAPTION>




                                                                       1933 ACT   1940 ACT
FUND NAME                                                      CIK     FILE NO.   FILE NO.
- ---------                                                      ---     --------   --------
<S>                                                           <C>      <C>        <C>



DEFINED ASSET FUNDS- USTST-1 DAF                              890652   33-48915   811-2810

TOTAL:    1 FUNDS

</TABLE>



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