USAA INVESTMENT TRUST
N-30D, 2000-01-25
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Table of Contents

      USAA Family of Funds                                    1
      Message from the President                              2
      Investment Review                                       4
      Message from the Manager                                5
      Shareholder Voting Results                              8
      Financial Information
         Portfolio of Investments                             9
         Notes to Portfolio of Investments                   10
         Statement of Assets and Liabilities                 11
         Statement of Operations                             12
         Statements of Changes in Net Assets                 13
         Notes to Financial Statements                       14









Important Information

Through  our  ongoing  efforts to reduce  expenses  and  respond to  shareholder
requests,  your annual and semiannual report mailings are streamlined.  One copy
of each report is sent to each address,  rather than to every registered  owner.
For many  shareholders  and their families,  this eliminates  duplicate  copies,
saving paper and postage costs to the Fund.

If you are the  primary  shareholder  on at least  one  account,  prefer  not to
participate in streamlining, and would like to continue receiving one report per
registered account owner, you may request this in writing to:

    USAA Investment Management Company
    Attn: Report Mail
    9800 Fredericksburg Road
    San Antonio, TX 78284-8916

or phone a mutual fund representative at 1-800-531-8448 during business hours.


This  report is for the  information  of the  shareholders  and  others who have
received a copy of the  currently  effective  prospectus of the USAA GNMA Trust,
managed by USAA Investment  Management  Company (IMCO).  It may be used as sales
literature only when preceded or accompanied by a current prospectus which gives
further details about the Fund.

USAA  with  the  eagle is  registered  in the U.S.  Patent &  Trademark  Office.
(Copyright)2000, USAA. All rights reserved.










                        USAA Family of Funds Summary

         Fund                                             Minimum
       Type/Name                     Volatility          Investment
       ---------                     ----------          ----------
 CAPITAL APPRECIATION
===============================================================================
 Aggressive Growth                 Very high               $3,000
 Emerging Markets                  Very high               $3,000
 First Start Growth                Moderate to high        $3,000
 Gold                              Very high               $3,000
 Growth                            Moderate to high        $3,000
 Growth & Income                   Moderate                $3,000
 International                     Moderate to high        $3,000
 S&P 500 (Registered Trademark)
  Index                            Moderate                $3,000
 Science & Technology              Very high               $3,000
 Small Cap Stock                   Very high               $3,000
 World Growth                      Moderate to high        $3,000

 ASSET ALLOCATION
===============================================================================
 Balanced Strategy                 Moderate                $3,000
 Cornerstone Strategy              Moderate                $3,000
 Growth and Tax
  Strategy                         Moderate                $3,000
 Growth Strategy                   Moderate to high        $3,000
 Income Strategy                   Low to moderate         $3,000

 INCOME - TAXABLE
===============================================================================
 GNMA                              Low to moderate         $3,000
 High-Yield
  Opportunities                    High                    $3,000
 Income                            Moderate                $3,000
 Income Stock                      Moderate                $3,000
 Intermediate-Term
  Bond                             Low to moderate         $3,000
 Short-Term Bond                   Low                     $3,000

 INCOME - TAX EXEMPT
===============================================================================
 Long-Term                         Moderate                $3,000
 Intermediate-Term                 Low to moderate         $3,000
 Short-Term                        Low                     $3,000
 State Bond Income                 Moderate                $3,000

 MONEY MARKET
===============================================================================
 Money Market                      Very low                $3,000
 Tax Exempt
  Money Market                     Very low                $3,000
 Treasury Money
  Market Trust                     Very low                $3,000
 State Money Market                Very low                $3,000
- -------------------------------------------------------------------------------

Foreign  investing is subject to  additional  risks,  which are discussed in the
funds'  prospectuses.

S&P 500(Registered  Trademark) is a trademark of The McGraw-Hill Companies, Inc.
and has been licensed for use. The Product is not sponsored, sold or promoted by
Standard & Poor's,  and Standard & Poor's makes no representation  regarding the
advisability of investing in the Product.

Some income may be subject to state or local  taxes or the  federal  alternative
minimum tax.

An investment in a money market fund is not insured or guaranteed by the FDIC or
any other  government  agency.  Although the fund seeks to preserve the value of
your  investment  at $1 per share,  it is possible to lose money by investing in
the fund.

The Science & Technology Fund may be more volatile than a fund that  diversifies
across many  industries.

The  InveStart(Registered  Trademark) program is available for investors without
the $3,000 initial  investment  required to open an IMCO mutual fund account.  A
mutual fund  account can be opened  with no initial  investment  if you elect to
have  monthly  automatic  investments  of at  least  $50  from a  bank  account.
InveStart is not  available on tax-exempt  funds or the S&P 500 Index Fund.  The
minimum  initial  investment  for IRAs is $250,  except for the  $2,000  minimum
required  for the S&P 500 Index  Fund.  IRAs are not  available  for  tax-exempt
funds.  The Growth and Tax Strategy Fund is not  available as an investment  for
your IRA because the majority of its income is tax exempt.

California,  Florida, New York, Texas, and Virginia funds available to residents
only.

Nondeposit  investment products are not insured by the FDIC, are not deposits or
other  obligations  of, or guaranteed by, USAA Federal Savings Bank, are subject
to investment risks, and may lose value.

For more complete  information about the mutual funds managed and distributed by
USAA Investment  Management  Company,  including charges and operating expenses,
please  call  1-800-531-8181  for a  prospectus.  Read it  carefully  before you
invest.









Message from the President



[PHOTOGRAPH OF PRESIDENT AND VICE CHAIRMAN OF THE BOARD, MICHAEL J.C. ROTH, CFA,
 APPEARS HERE]


As I write this  message,  I am also in the process of preparing to lead a panel
on personal  finance at the Greater San  Antonio  Chamber of  Commerce's  annual
conference  on economic  development.  As we enter 2000,  I have asked my fellow
panelists  to look back to what they  consider to be the key  lessons  they have
learned in careers that all span at least 25 years in investments.

The incident  and the person I have chosen is the visit of a  well-known  equity
strategist from one of the major investment bankers to San Antonio in the spring
of 1982.  I should  remind you what the spring of 1982 was like.  The market had
not yet shaken off the effects of repeated,  arbitrary increases in the price of
oil; the roaring  inflation which followed;  and the highest U.S. interest rates
since  the  Civil  War.  Stocks  and  bonds  had not yet  come off  their  worst
performance  since World War II. Against this backdrop,  that well-known  equity
strategist delivered a magnificent after-dinner  presentation.  He plucked facts
and  figures  from a wide  variety  of sources  and wove them into a  compelling
argument. His conclusion was clear: "Stay out of this market!" He was brilliant.

He was dead wrong. That summer saw the beginning of the greatest bull market for
both stocks and bonds in U.S. history.

This  incident has greatly  influenced  my thinking and my career.  It taught me
these things:

    - It is best to base investment strategy on something other than a
      forecast of the market.

    - If you insist on forecasting the market, it doesn't help to make
      the little calls.  You absolutely must be right at times like
      spring of 1982.

    - If you use an asset allocation approach to investing, your chances
      of being in at a major turning  point are 100%.

That is why I believe in the asset allocation approach of our strategy funds.


Sincerely,



Michael J.C. Roth, CFA
President and
Vice Chairman of the Board


Past performance is no guarantee of future results.

For more complete  information about the mutual funds managed and distributed by
USAA Investment  Management  Company,  including charges and operating expenses,
please call for a prospectus. Read it carefully before investing.









Investment Review



USAA GNMA TRUST

OBJECTIVE:  High  level  of  current  income  consistent  with  preservation  of
principal.

TYPES OF INVESTMENTS: Invests principally in securities backed by the full faith
and credit of the U.S. government; mostly GNMA pass-through certificates,  which
represent ownership in a pool of mortgage loans or a single mortgage loan.


- --------------------------------------------------------------------------------
                                           11/30/99              5/31/99
================================================================================
  Net Assets                            $463.8 Million       $500.5 Million
  Net Asset Value Per Share                  $9.51               $10.00
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
Average Annual Total Returns and 30-Day SEC Yield(*) as of 11/30/99
================================================================================
        5/31/99                              Since Inception     30-Day
     to 11/30/99(+)   1 Year     5 Years        on 2/1/91       SEC Yield
        -1.68%        -2.71%      6.86%           6.75%           6.72%
- --------------------------------------------------------------------------------

(*) Calculated as prescribed by the  Securities  and Exchange  Commission.

(+) Total  returns  for periods of less than one year are not  annualized.  This
    six-month return is cumulative.

Total  return   equals   income  yield  plus  share  price  change  and  assumes
reinvestment of all dividends and capital gains distributions. No adjustment has
been made for taxes payable by shareholders on their reinvested income dividends
and capital gains  distributions.  The  performance  data quoted  represent past
performance and are not an indication of future results.  Investment  return and
principal value of an investment will fluctuate,  and an investor's shares, when
redeemed, may be worth more or less than their original cost.


                     CUMULATIVE PERFORMANCE COMPARISON

A chart in the form of a line graph appears here, illustrating the comparison of
a $10,000  hypothetical  investment in the USAA GNMA Trust,  the Lehman Brothers
Inc.  GNMA 30-Year  Index,  and the Lipper GNMA Funds  Average for the period of
2/01/91 through 11/30/99. The data points from the graph are as follows:

               USAA GNMA            Lehman             Lipper
                 Trust              Index              Average
              -------------         -------            -------

02/01/91       $10,000              $10,000           $10,000
05/31/91        10,207               10,335            10,279
11/30/91        10,932               11,173            11,016
05/31/92        11,382               11,651            11,469
11/30/92        11,838               12,128            11,911
05/31/93        12,594               12,765            12,531
11/30/93        12,731               12,969            12,772
05/31/94        12,677               12,721            12,464
11/30/94        12,778               12,750            12,419
05/31/95        14,013               14,193            13,756
11/30/95        14,818               14,898            14,421
05/31/96        14,524               14,953            14,351
11/30/96        15,575               16,007            15,318
05/31/97        15,865               16,375            15,558
11/30/97        16,759               17,292            16,422
05/31/98        17,554               17,958            17,052
11/30/98        18,296               18,584            17,606
05/31/99        18,105               18,837            17,710
11/30/99        17,801               19,052            17,853

Data since inception on 2/01/91 through 11/30/99


The graph illustrates the comparison of a $10,000 hypothetical investment in the
USAA GNMA Trust to the broad-based unmanaged index of the Lehman Brothers,  Inc.
GNMA  30-Year  Index and an  unmanaged  index of funds  similar  to the Trust as
represented by the Lipper GNMA Funds Average.  Lipper Analytical Services,  Inc.
is an independent organization that monitors the performance of mutual funds.









Message from the Manager

[PHOTOGRAPH OF PORTFOLIO MANAGER: DONNA J. BAGGERLY, CFA, APPEARS HERE]


INTEREST RATE MARKET

Interest  rates on November 30, 1999,  were higher than at the beginning of this
reporting period, May 31, 1999.


              GNMA PASS-THROUGH AND U.S. TREASURY NOTE YIELDS

A graph is shown comparing the GNMA 6.5% 30-Year Pass-through Certificate to the
10-Year U.S.  Treasury  Note for the period  05/31/99 to 11/30/99.  The vertical
axis shows the yield and the  horizontal  axis shows the time  period.  The data
points from the graph are as follows:


              GNMA 6.5% 30-Year                     10-Year
           Pass-through Certificate            U.S. Treasury Note
           ------------------------            ------------------
05/31/99             6.93%                            5.62%
06/30/99             7.06%                            5.78%
07/30/99             7.34%                            5.90%
08/31/99             7.46%                            5.97%
09/30/99             7.22%                            5.88%
10/29/99             7.25%                            6.02%
11/30/99             7.35%                            6.19%


Please note that the top line is the yield of the 6.5% 30-year GNMA pass-through
certificate.  The bottom line in the graph  represents  the yield of the 10-year
U.S.  Treasury note, which is the industry  standard against which most mortgage
securities  are measured.

Following  the highly  volatile  period from August to November  1998,  the bond
market  stabilized  through  January 1999.  Since then interest rates have moved
upward,  depressing  bond prices  again.

Economic strength continued through November 1999,  renewing inflation fears and
the  specter of higher  interest  rates.  This fear  continues  even  though the
Federal  Reserve  (the Fed)  raised  interest  rates  0.25%  three  times in the
six-month  period:  in June,  August,  and  November.  The yield on the  10-year
Treasury  note has moved from 5.62% on May 28,  1999,  to 6.19% for November 30,
1999, the end of this reporting period. With the yield on the Treasury note over
6%, this rise in interest rates may be about over.

USAA GNMA TRUST PERFORMANCE

While past performance is no guarantee of future results,  from May 31, 1999, to
November 30, 1999, your Fund paid an annualized  dividend  distribution yield of
6.25% versus an average annualized dividend  distribution yield of 5.70% for the
Lipper GNMA Funds Average.  During the six-month period, the Trust's share price
fell $0.49 to $9.51.  Over this period,  your Fund had a total return of -1.79%,
below the Lipper  GNMA  Funds  Average  total  return of 0.60% for the same time
period.

THE USAA GNMA TRUST PORTFOLIO

With the 10-year  Treasury note rate up over 0.40% since May 31, 1999,  and over
1.50% since the beginning of the year, investing for low prepayment risk has had
the side effect of increasing  the  volatility of mortgage  securities and funds
that invest in them. As expected in a period of rising interest rates,  the USAA
GNMA Trust  experienced  negative  performance for the year due to a significant
price  decline.  With the Fed raising  rates three times in 1999 and its concern
with inflation and the current tight labor market,  there is a possibility  that
the Fed may raise  rates  again in 2000.  A number of steps  have been  taken to
decrease the  volatility  of the Fund if interest  rates  continue to rise.  The
portfolio's holdings in 6% and 6.5% fixed-rate single-family mortgages were sold
and  the  proceeds  were  reinvested  in 7% and  7.5%  fixed-rate  single-family
mortgages.  Virtually  all of the project  loans were sold,  and  proceeds  were
invested in 7.5% and 8% fixed-rate single-family mortgages. We still continue to
hold the construction loan investments.

The following graph shows the fixed-rate  single-family  mortgage composition by
coupon.


      FIXED-RATE SINGLE-FAMILY MORTGAGE POOL COMPOSITION BY COUPON RATE

A bar graph is shown here  illustrating  the Fixed-Rate  Single-Family  Mortgage
Pool  Composition  by Coupon Rate as of 11/30/99.  The  vertical  axis shows the
coupon rate, and the horizontal axis shows the category percentage.

The values are:

Coupon Rate      5.5    6.75    7.0    7.5    8.0    8.5    9.0

Category %       6.2    1.3    12.9   10.6   16.6    1.0    0.5


The graph also shows the average coupon rate to be 6.5%.


Twelve-month dividend yield is computed by dividing income dividends paid during
the 12 months by the latest month-end net asset value adjusted for capital gains
distributions.

Refer to the bottom of page 4 for the Lipper Average definition.

The economy is still growing with no sign of rising inflation.  Many - including
the Fed - are  wondering  how long low  inflation can continue with such a tight
labor market. Therefore, as we enter the year 2000 and more economic information
becomes available, your Fund may continue to be repositioned for rising rates if
it appears warranted. However, as in the past, the USAA GNMA Trust will continue
to be managed with the  objective  of  returning a high level of current  income
consistent with preservation of principal.


- --------------------------------------------------------------------------------
NEW PORTFOLIO MANAGER

On November 1, 1999, Donna Baggerly  assumed  management of the USAA GNMA Trust.
Donna was a senior analyst at USAA Investment  Management Company for four years
and has a total of 12 years of investment management experience. Her predecessor
in  managing  your Fund,  Ken  Willmann,  moved into senior  management  of USAA
Investment Management Company.
- --------------------------------------------------------------------------------


                           TYPES OF MORTGAGES
                                11/30/99

A pie chart is shown here  depicting  the Types of  Mortgages as of November 30,
1999 of the USAA GNMA Trust to be:

Fixed-Rate Single-Family - 48.6%; and Construction Loans - 48.9%.


Percentages  are of the net  assets  in the  portfolio  and may or may not equal
100%.

See page 9 for a complete listing of the portfolio of investments.








Shareholder Voting Results



On October 15, 1999, a special meeting of  shareholders  was held to vote on the
following  proposals.  All  proposals  were  approved by the  shareholders.  All
shareholders  of  record on  August  19,  1999,  were  entitled  to vote on each
proposal.  The number of votes shown below are for the entire series of the USAA
Investment Trust (the Trust) for proposals 1 and 2.

1 Proposal to elect Trustees as follows:

     TRUSTEES                      VOTES FOR             VOTES WITHHELD
     Robert G. Davis              181,888,787              2,690,901
     Michael J.C. Roth            181,881,641              2,698,047
     David G. Peebles             181,888,787              2,690,901
     Robert L. Mason              181,888,787              2,690,901
     Michael F. Reimherr          181,883,427              2,696,261
     Richard A. Zucker            181,875,813              2,696,966
     Barbara B. Dreeben           181,883,427              2,696,261

John W. Saunders,  Jr. and Howard L. Freeman,  Jr. did not stand for re-election
to the Board. Their term of office will terminate on December 31, 1999.

2  Proposal  to ratify the  selection  by the Board of  Trustees  of KPMG LLP as
auditors for the Trust for the fiscal year ending May 31, 2000.



                            NUMBER OF SHARES VOTING
- --------------------------------------------------------------------------------
            FOR                     AGAINST                  ABSTAIN
         179,181,697               2,930,888                2,467,103









USAA GNMA TRUST
PORTFOLIO OF INVESTMENTS
(IN THOUSANDS)

November 30, 1999
(Unaudited)



  Principal                                                              Market
   Amount                     Security                                    Value
- --------------------------------------------------------------------------------

                   U.S. GOVERNMENT & AGENCY ISSUES (101.8%)

            Government National Mortgage Assn. I, Single Family (42.0%)
  $ 6,427   6.75%, 5/15/2028                                            $  6,187
   61,115   7.00%, 4/15/2027 - 6/15/2029 (b)                              59,704
   49,283   7.50%, 2/15/2028 - 10/15/2029 (b)                             49,188
   73,698   8.00%, 1/15/2022 - 12/15/2029 (a),(b)                         74,946
    2,350   8.50%, 6/15/2021 - 7/15/2022                                   2,442
    2,086   9.00%, 7/15/2021                                               2,200
- --------------------------------------------------------------------------------
                                                                         194,667
- --------------------------------------------------------------------------------

            Government National Mortgage Assn. II, Single Family (6.6%)
   31,984   5.50%, 12/20/2028 - 2/20/2029 (b)                             28,580
    1,920   8.00%, 12/20/2022                                              1,954
- --------------------------------------------------------------------------------
                                                                          30,534
- --------------------------------------------------------------------------------

            Government National Mortgage Assn. I, Construction Loan (48.9%)
   22,396   6.25%, 10/15/2001 (a)                                         19,817
    5,880   6.35%, 3/15/2001 (a)                                           5,195
    9,231   6.38%, 7/15/2001 (a)                                           8,142
    7,598   6.40%, 6/15/2000 - 10/15/2000 (a)                              6,842
   30,422   6.50%, 3/15/2001 - 5/15/2001 (a)                              27,110
   49,300   6.63%, 4/15/2002 (a)                                          44,462
    9,513   6.70%, 9/15/2000 (a)                                           8,806
    8,502   6.80%, 5/15/2000 (a)                                           7,934
    3,575   6.85%, 4/15/2000 (a)                                           3,335
   11,838   6.88%, 7/15/2000 (a)                                          11,096
   16,635   7.00%, 8/15/2000 (a)                                          15,722
    7,028   7.05%, 4/15/2000 (a)                                           6,615
   64,088   7.50%, 7/15/2002 (a)                                          61,825
- --------------------------------------------------------------------------------
                                                                         226,901
- --------------------------------------------------------------------------------

            U.S. Treasury Note (4.3%)
   20,000   6.38%, 1/15/2000                                              20,019
- --------------------------------------------------------------------------------
            Total U.S. government & agency issues (cost: $493,650)       472,121
- --------------------------------------------------------------------------------

                       REPURCHASE AGREEMENTS (16.7%)

   77,475   Deutsche Bank Securities Corp., 5.58%, acquired on
              11/30/99 and due 12/01/99 at $77,487 (collateralized
              by a $74,050 U.S. Treasury Note, 7.25%, due 5/15/16;
              market value of $79,063) (cost: $77,475) (b)                77,475
- --------------------------------------------------------------------------------
            Total investments (cost: $571,125)                          $549,596
================================================================================









USAA GNMA TRUST
NOTES TO PORTFOLIO OF INVESTMENTS


November 30, 1999
(Unaudited)


GENERAL  NOTES
Market values of securities are determined by procedures and practices discussed
in note 1 to the financial statements.

The cost of securities for federal income tax purposes is approximately the same
as that reported in the financial statements.

The percentages shown represent the percentage of the investments to net assets.


SPECIFIC NOTES
(a) At November 30, 1999, the cost of securities purchased on a delayed-delivery
basis was $169.5  million.  The majority of these are GNMA  construction  loans,
which are  drawn  against  monthly  during  the  construction  period.  Once the
construction is completed, the security converts to a project loan.

(b) At November 30, 1999,  portions of these securities were segregated to cover
delayed-delivery purchases.



See accompanying notes to financial statements.







<TABLE>

USAA GNMA TRUST
STATEMENT OF ASSETS AND LIABILITIES
(IN THOUSANDS)

November 30, 1999
(Unaudited)



<S>                                                                                 <C>
ASSETS
   Investments in securities, at market value (identified cost of $493,650)         $472,121
   Repurchase agreements                                                              77,475
   Cash                                                                                   55
   Receivables:
      Capital shares sold                                                                 49
      Interest                                                                         3,586
      Securities sold                                                                 81,228
                                                                                    --------
         Total assets                                                                634,514
                                                                                    --------

LIABILITIES
   Securities purchased                                                              169,523
   Capital shares redeemed                                                               366
   USAA Investment Management Company                                                     48
   USAA Transfer Agency Company                                                           50
   Accounts payable and accrued expenses                                                  23
   Dividends on capital shares                                                           698
                                                                                    --------
         Total liabilities                                                           170,708
                                                                                    --------
            Net assets applicable to capital shares outstanding                     $463,806
                                                                                    ========

REPRESENTED BY:
   Paid-in capital                                                                  $503,027
   Accumulated net realized loss on investments                                      (17,692)
   Net unrealized depreciation of investments                                        (21,529)
                                                                                    --------
            Net assets applicable to capital shares outstanding                     $463,806
                                                                                    ========
   Capital shares outstanding, unlimited number of shares authorized,
      no par value                                                                    48,818
                                                                                    ========
   Net asset value, redemption price, and offering price per share                  $   9.51
                                                                                    ========



See accompanying notes to financial statements.
</TABLE>









USAA GNMA TRUST
STATEMENT OF OPERATIONS
(IN THOUSANDS)

Six-month period ended November 30, 1999
(Unaudited)



Net investment income:
   Interest income                                           $ 16,616
                                                             --------
   Expenses:
      Management fees                                             298
      Transfer agent's fees                                       298
      Custodian's fees                                             53
      Postage                                                      28
      Shareholder reporting fees                                   15
      Trustees' fees                                                2
      Registration fees                                            13
      Professional fees                                            13
      Other                                                         8
                                                             --------
         Total expenses                                           728
                                                             --------
            Net investment income                              15,888
                                                             --------
Net realized and unrealized loss on investments:
   Net realized loss                                           (8,415)
   Change in net unrealized appreciation/depreciation         (16,576)
                                                             --------
            Net realized and unrealized loss                  (24,991)
                                                             --------
Decrease in net assets resulting from operations             $ (9,103)
                                                             ========



See accompanying notes to financial statements.








<TABLE>

USAA GNMA TRUST
STATEMENTS OF CHANGES IN NET ASSETS
(IN THOUSANDS)

Six-month period ended November 30, 1999,
and year ended May 31, 1999
(Unaudited)


<CAPTION>

                                                                11/30/99         5/31/99
                                                               ---------------------------
<S>                                                             <C>              <C>
From operations:
   Net investment income                                        $ 15,888         $ 27,716
   Net realized gain (loss) on investments                        (8,415)           2,274
   Change in net unrealized depreciation
      of investments                                             (16,576)         (18,135)
                                                                --------------------------
      Increase (decrease) in net assets
         resulting from operations                                (9,103)          11,855
                                                                --------------------------
Distributions to shareholders from:
   Net investment income                                         (15,888)         (27,716)
                                                                --------------------------
From capital share transactions:
   Proceeds from shares sold                                      48,493          212,281
   Shares issued for dividends reinvested                         11,747           20,534
   Cost of shares redeemed                                       (71,907)         (94,018)
                                                                --------------------------
      Increase (decrease) in net assets from capital
         share transactions                                      (11,667)         138,797
                                                                --------------------------
Net increase (decrease) in net assets                            (36,658)         122,936
Net assets:
   Beginning of period                                           500,464          377,528
                                                                --------------------------
   End of period                                                $463,806         $500,464
                                                                ==========================
Change in shares outstanding:
   Shares sold                                                     5,020           20,571
   Shares issued for dividends reinvested                          1,223            1,992
   Shares redeemed                                                (7,453)          (9,126)
                                                                --------------------------
      Increase (decrease) in shares outstanding                   (1,210)          13,437
                                                                ==========================



See accompanying notes to financial statements.
</TABLE>










USAA GNMA TRUST
NOTES TO FINANCIAL STATEMENTS


November 30, 1999
(Unaudited)



(1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

USAA INVESTMENT TRUST (the Trust),  registered under the Investment  Company Act
of 1940, as amended, is a diversified,  open-end  management  investment company
organized as a Massachusetts business trust consisting of eleven separate funds.
The information  presented in this  semiannual  report pertains only to the USAA
GNMA Trust (the  Fund).  The Fund's  investment  objective  is to provide a high
level  of  current  income  consistent  with  preservation  of  principal.  USAA
Investment  Management  Company (the Manager) seeks to achieve this objective by
investing the Fund's assets in securities backed by the full faith and credit of
the U.S. government.

A.  Security  valuation - The value of each  security is  determined  (as of the
close of  trading  on the New  York  Stock  Exchange  on each  business  day the
Exchange is open) as set forth below:

1.  Government  securities  are  valued each  business  day by a pricing service
(the Service)  approved by the Trust's  Board of Trustees.  The Service uses the
mean  between  quoted  bid and  asked  prices  or the last  sale  price to price
securities when, in the Service's judgement,  these prices are readily available
and are  representative of the securities'  market values.  For many securities,
such  prices are not  readily  available.  The Service  generally  prices  these
securities  based on methods which include  consideration of yields or prices of
securities of comparable quality,  coupon,  maturity and type; indications as to
values from dealers in securities; and general market conditions.

2.  Securities  purchased  with  maturities  of 60 days or less  are  stated  at
amortized  cost,  which  approximates  market value.  Repurchase  agreements are
valued at cost.

3.  Securities  that cannot be valued by the methods  set forth  above,  and all
other assets,  are valued in good faith at fair value,  using methods determined
by the Manager under the general supervision of the Board of Trustees.

B.  Federal taxes - The Fund's policy is to comply with the  requirements of the
Internal  Revenue Code  applicable  to  regulated  investment  companies  and to
distribute  substantially all of its income to its shareholders.  Therefore,  no
federal income or excise tax provision is required.

C.  Investments in securities - Security  transactions  are accounted for on the
date the securities are purchased or sold (trade date).  Gain or loss from sales
of investment  securities  is computed on the  identified  cost basis.  Interest
income is recorded on the accrual  basis.  Discounts  and premiums on securities
are amortized over the life of the respective securities.

D.  Use of estimates - The preparation  of  financial statements  in  conformity
with  generally  accepted  accounting  principles  requires  management  to make
estimates and assumptions  that may affect the reported amounts in the financial
statements.

(2) LINES OF CREDIT

The Fund participates with other USAA funds in three joint short-term  revolving
loan  agreements  totaling  $850  million,  two with  USAA  Capital  Corporation
(CAPCO),  an affiliate of the Manager ($250  million  committed and $500 million
uncommitted), and one with Bank of America ($100 million committed). The purpose
of the  agreements  is to meet  temporary  or  emergency  cash needs,  including
redemption  requests that might  otherwise  require the untimely  disposition of
securities.  Subject to availability  under both agreements with CAPCO, the Fund
may borrow from CAPCO an amount up to 5% of the Fund's  total  assets at CAPCO's
borrowing rate with no markup.  Subject to availability under its agreement with
Bank of America,  the Fund may borrow from Bank of America, at Bank of America's
borrowing  rate  plus a markup,  an  amount  which,  when  added to  outstanding
borrowings under the CAPCO  agreements,  does not exceed 25% of the Fund's total
assets.  The Fund had no borrowings under either of these agreements  during the
six-month period ended November 30, 1999.

(3) DISTRIBUTIONS

Distributions of realized gains from security transactions not offset by capital
losses are made in the succeeding fiscal year or as otherwise  required to avoid
the  payment  of  federal  taxes.  Net  investment  income is  accrued  daily as
dividends and  distributed to  shareholders  monthly.  At November 30, 1999, the
Fund  had  capital  loss   carryovers   for  federal   income  tax  purposes  of
approximately  $17.7 million which,  if not offset by subsequent  capital gains,
will  expire  between  2003 - 2008.  It is unlikely  that the  Trust's  Board of
Trustees will authorize a  distribution  of capital gains realized in the future
until the capital loss carryovers have been utilized or expire.

(4) INVESTMENT TRANSACTIONS

Cost of purchases and proceeds from  sales/maturities  of securities,  excluding
short-term  securities,  for the six-month  period ended November 30, 1999, were
$300.1 million and $301.1 million, respectively.

Gross  unrealized  appreciation  and depreciation of investments at November 30,
1999, were $.1 million and $21.6 million, respectively.

(5) TRANSACTIONS WITH MANAGER

A.  Management fees - USAA Investment  Management Company carries out the Fund's
investment policies and manages the Fund's portfolio. The Fund's management fees
are computed at .125% of its annual average net assets.

B.  Transfer agent's fees - USAA Transfer Agency Company, d/b/a USAA Shareholder
Account Services, an affiliate of the Manager,  provides transfer agent services
to the Fund based on an annual  charge of $28.50 per  shareholder  account  plus
out-of-pocket expenses.

C.  Underwriting  services - The Manager  provides  exclusive  underwriting  and
distribution  of the Fund's  shares on a  continuing,  best-efforts  basis.  The
Manager receives no commissions or fees for this service.

(6) TRANSACTIONS WITH AFFILIATES

Certain trustees and officers of the Fund are also directors,  officers,  and/or
employees  of the  Manager.  None of the  affiliated  trustees or Fund  officers
received any compensation from the Fund.


(7) REPURCHASE AGREEMENTS

The  Fund  may  enter  into  repurchase  agreements  with  commercial  banks  or
recognized  security  dealers.  These  agreements  are  secured  exclusively  by
obligations  backed  by the  full  faith  and  credit  of the  U.S.  government.
Obligations  pledged as collateral  are required to maintain a value equal to or
in excess of the resale price of the  repurchase  agreement  and are held by the
Fund's custodian until maturity of the repurchase agreement.  The Fund's Manager
monitors  the  creditworthiness  of  sellers  with which the Fund may enter into
repurchase agreements.

(8) YEAR 2000 (UNAUDITED)

Like other mutual  funds,  the Fund could be adversely  affected if the computer
systems used by the Manager and the Fund's other service  providers are not able
to perform  their  intended  functions  effectively  after  1999  because of the
inability of computer  software to distinguish the year 2000 from the year 1900.
The Manager has taken steps to address  this  potential  year 2000  problem with
respect  to the  computer  systems  that  they  use and to  obtain  satisfactory
assurances  that the comparable  steps are being taken by the Fund's other major
service providers.  At this time, however,  there can be no assurance that these
steps  will be  sufficient  to avoid  any  adverse  impact to the Fund from this
problem.

(9) FINANCIAL HIGHLIGHTS

Per share operating  performance for a share outstanding  throughout each period
is as follows:

<TABLE>
<CAPTION>

                               Six-month
                              Period Ended
                               November 30,                      Year Ended May 31,
                              --------------------------------------------------------------------------
                                  1999         1999        1998         1997         1996         1995
                              --------------------------------------------------------------------------
<S>                            <C>          <C>          <C>          <C>          <C>          <C>
Net asset value at
   beginning of period         $  10.00     $  10.32     $   9.95     $   9.76     $  10.09     $   9.82
Net investment income               .32          .65          .66          .69          .70          .72
Net realized and
   unrealized gain (loss)          (.49)        (.32)         .37          .19         (.33)         .27
Distributions from net
   investment income               (.32)        (.65)        (.66)        (.69)        (.70)        (.72)
                              --------------------------------------------------------------------------
Net asset value at
   end of period               $   9.51     $  10.00     $  10.32     $   9.95     $   9.76     $  10.09
                              ==========================================================================
Total return (%) *                (1.68)        3.13        10.65         9.23         3.65        10.54
Net assets at end
   of period (000)             $463,806     $500,464     $377,528     $308,798     $301,589     $265,571
Ratio of expenses to
   average net
   assets (%)                       .31(a)       .31          .30          .30          .32          .32
Ratio of net investment
   income to average net
   assets (%)                      6.66(a)      6.24         6.48         6.93         6.90         7.34
Portfolio turnover (%)            56.36        64.93        60.85        77.82       127.77        93.78
</TABLE>



  * Assumes reinvestment of all dividend income distributions during the period.
(a) Annualized.  The  ratio  is not  necessarily  indicative  of 12  months  of
operations.



TRUSTEES
Robert G. Davis, Chairman of the Board
Michael J.C. Roth, President and Vice Chairman of the Board
John W. Saunders, Jr., Vice President
Barbara B. Dreeben
Howard L. Freeman, Jr.
Robert L. Mason
Richard A. Zucker

INVESTMENT ADVISER, UNDERWRITER, AND DISTRIBUTOR
USAA Investment Management Company
9800 Fredericksburg Road
San Antonio, Texas 78288

TRANSFER AGENT
USAA Shareholder Account Services
9800 Fredericksburg Road
San Antonio, Texas 78288

CUSTODIAN
State Street Bank and Trust Company
P.O. Box 1713
Boston, Massachusetts 02105

LEGAL COUNSEL
Goodwin, Procter & Hoar LLP
Exchange Place
Boston, Massachusetts 02109

INDEPENDENT AUDITORS
KPMG LLP
112 East Pecan, Suite 2400
San Antonio, Texas 78205

Telephone Assistance Hours
Call toll free - Central Time
Monday - Friday 7:00 a.m. to 9:00 p.m.
Saturdays 8:30 a.m. to 5:00 p.m.
Sundays 11:30 a.m. to 8:00 p.m.

Internet Access
usaa.com(Service Mark)

For Additional Information on Mutual Funds
1-800-531-8181, (in San Antonio) 456-7211
For account servicing, exchanges, or redemptions
1-800-531-8448, (in San Antonio) 456-7202

Recorded Mutual Fund Price Quotes
24-hour service (from any phone)
1-800-531-8066, (in San Antonio) 498-8066

Mutual Fund USAA TouchLine(Registered Trademark)
(from touch-tone phones only)
For account balance, last transaction, fund prices,
or to exchange or redeem fund shares
1-800-531-8777, (in San Antonio) 498-8777




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