USAA INVESTMENT TRUST
N-30D, 1999-07-22
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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
      Financial Information:
         Independent Auditors' Report                               10
         Portfolio of Investments                                   11
         Notes to Portfolio of Investments                          13
         Statement of Assets and Liabilities                        14
         Statement of Operations                                    15
         Statements of Changes in Net Assets                        16
         Notes to Financial Statements                              17










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)1999, 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
 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
 Income                            Moderate                $3,000
 Income Stock                      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, such as currency fluctuations,
market illiquidity, and political instability.

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.

Non-deposit 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]


When I was a second  lieutenant  in pilot  training at Williams  AFB, I read the
book THIS KIND OF WAR by T. R.  Fehrenbach.  More than 30 years  later I met Ted
Fehrenbach  here in San  Antonio  where he resides  and had a chance to tell him
that I think he is a brilliant man. I recall reading that LBJ declared THIS KIND
OF WAR required reading for people in his  administration.  Ted writes a regular
Sunday column for the San Antonio  Express News, and he continues to delight me.
Last year he wrote a piece around Columbus Day, which included this observation:

   "Spain was clearly disappointed with her admiral. While he
    had spent  much money  charting  islands  with  mosquitoes
    and a  miserable climate  (from the Euro  standpoint)...the
    Portuguese had reached the real India and returned with
    fabulous profits. Of course,  Columbus had opened up to
    Spain a vast empire,  filled with  treasures of every kind,
    but then few investors take the long view."

As I read this  passage,  I thought  that Ted's  understanding  of markets is as
sharp as his grasp of history.  At the beginning of 1999, there indeed seemed to
be few  investors  with the long view.  There  were many  people  declaring  the
absolute  superiority of the S&P 500 and growth stocks,  especially tech stocks,
while  proclaiming  that strategies such as value investing and asset allocation
were no longer relevant.

The S&P 500 and its index funds have had a wondrous four years,  but here we are
five-and-a-half  months into 1999, and what a difference  we're seeing:  The Dow
Jones  Industrial  Average  is up more than  twice as much as the S&P 500 so far
this year.

The S&P 500 Index is heavily influenced by companies like America Online,  Cisco
Systems, Intel, IBM, Lucent, MCI, and Microsoft.  The Dow also includes IBM, but
its impetus is coming from companies such as J.P.  Morgan,  Alcoa,  Caterpillar,
Disney,  General Motors,  and Union Carbide.  The upshot of this is that you can
afford to take the long  view.  Value  investing  or asset  allocation  are just
different from a growth  philosophy.  My view,  throughout the last 27 years, is
that these methods go through cycles of in-favor and  out-of-favor.  But they do
cycle.  And just  about the time you begin to read that one of them is no longer
viable,  you can bet the market will change.  A good  discipline  practiced well
will give you a very good chance of prospering in the long run.

Sincerely,



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



The S&P 500  Index is an  unmanaged  index  representing  the  weighted  average
performance of a group of 500 widely held,  publicly  traded  stocks.  It is not
possible to invest in the S&P 500 Index.

The Dow Jones  Industrial  Average  (DJIA)  is a  price-weighted  average  of 30
actively  traded blue chip stocks.

Past  performance  is no guarantee of future results.









Investment Review


USAA GNMA TRUST

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

TYPES OF INVESTMENTS:  Invests  primarily 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.



- --------------------------------------------------------------------------------
                                           5/31/99               5/31/98
================================================================================
  Net Assets                            $500.5 Million       $377.5 Million
  Net Asset Value Per Share                 $10.00               $10.32
- --------------------------------------------------------------------------------


- --------------------------------------------------------------------------------
AVERAGE ANNUAL TOTAL RETURNS AND 30-DAY SEC YIELD* AS OF 5/31/99
================================================================================
  1 Year       5 Years       Since Inception on 2/1/91       30-Day SEC Yield
   3.15%        7.39%                  7.38%                       6.28%
- --------------------------------------------------------------------------------

* Calculated as prescribed by the Securities and Exchange Commission.

Total  return   equals   income  yield  plus  share  price  change  and  assumes
reinvestment of all dividends and capital gain distributions.  No adjustment has
been made for taxes payable by shareholders on their reinvested income dividends
and capital gain  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 5/31/99. 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               10,336            10,280
11/30/91        10,932               11,178            11,018
05/31/92        11,382               11,659            11,478
11/30/92        11,838               12,139            11,912
05/31/93        12,594               12,773            12,531
11/30/93        12,731               12,974            12,766
05/31/94        12,677               12,726            12,463
11/30/94        12,778               12,758            12,425
05/31/95        14,013               14,205            13,758
11/30/95        14,818               14,917            14,423
05/31/96        14,524               14,972            14,360
11/30/96        15,575               16,040            15,328
05/31/97        15,865               16,409            15,573
11/30/97        16,759               17,328            16,438
05/31/98        17,554               17,995            17,070
11/30/98        18,296               18,622            17,620
05/31/99        18,105               18,876            17,715

Data since inception on 2/01/91 through 5/31/99


The graph  illustrates  how a $10,000  hypothetical  investment in the USAA GNMA
Trust closely tracks 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.










Message from the Manager


[PHOTOGRAPH OF PORTFOLIO MANAGER:  KENNETH E. WILLMANN, CFA, APPEARS HERE]


INTEREST RATE MARKET
Interest rates on May 31, 1999, were a bit higher than a year earlier.  But that
simple statement doesn't begin to describe the events of the last twelve months.
The graph below shows what happened.



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  05/31/98 to 05/31/99.  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
           ------------------------            ------------------
05/31/98             6.63%                            5.55%
08/31/98             6.42%                            4.98%
11/30/98             6.38%                            4.71%
02/28/99             6.66%                            5.29%
05/31/99             6.95%                            5.62%


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.

Against a backdrop  of economic  depression  in most of Asia,  Russia  collapsed
economically in early summer of 1998. Latin America,  particularly Brazil, began
to show signs of  weakness.  Investors  worldwide  became  fearful of  spreading
economic  collapse and purchased  U.S.  Treasury bonds as the ultimate in safety
and liquidity.  This forced prices up and yields down. The U.S. stock market was
also affected,  and on August 31, 1998, the Dow Jones Industrial Average(1) fell
over 500 points.  At the end of September,  Russia  defaulted on its debt, which
led to the failure of several hedge funds.  These are private  investment  funds
that invest in exotic  securities  with high  degrees of  leverage.  This led to
worries about the health of U.S. bank and brokerage  houses. On October 5, 1998,
the 10-year  Treasury  note reached a yield of 4.16%,  a level that had not been
seen in decades.

Much of the world's economy began to stabilize in the autumn and winter of 1998.
While  recovery is very hard to find, it appears that the weakest  economies are
no longer in free fall.  Stock  markets  around the world began to recover.  The
worldwide panic was over.

The U.S.  economy and the economy of most of Western Europe never  faltered.  In
fact,  the continued  robustness of the U.S.  economy is beginning to worry many
people. There are signs of a resurgence in inflation.  Will the expansion end in
sudden  collapse  since much of the strength is being financed by extremely high
and growing consumer debt? These concerns are apparent in the course of interest
rates in the last seven months. They have risen  substantially,  just what would
be expected in these circumstances.

While the yield on the Treasury note was very volatile in this period, the yield
on the mortgage  security was  significantly  less so. Remember that bond prices
move in opposite  directions to yields,  so prices on the two securities  showed
similar relative  volatility.  Most mortgage  securities  receive  principal and
interest monthly,  while the Treasury  securities receive interest  semiannually
and  principal at maturity.  The  smaller,  more-frequent  payments of mortgages
leads to lower volatility.  While GNMA securities offer the same ultimate credit
quality as Treasury  securities,  the fact that mortgages can usually be prepaid
at any time leads to  uncertainty  in the timing and size of monthly cash flows.
This  uncertainty  is  referred to as  prepayment  risk and leads to both higher
yields and lower volatility.


(1)  The Dow Jones Industrial  Average (DJIA) is a price-weighted  average of 30
     actively trade blue chip stocks.


THE GNMA TRUST PORTFOLIO
The prime  differentiator of mortgage  securities is structure.  Prepayment risk
inherent  in  different  types of  mortgages  is  perhaps  the major  structural
difference.  GNMA construction loans and project loans are commercial  mortgages
which  typically  cannot be  prepaid  for a period of ten years  from  issuance.
Fixed-rate single-family home mortgages can be prepaid at any time. This has led
me to spread prepayment risk as seen in the graph on the opposite page.



TYPES OF MORTGAGES
- ------------------
A pie chart is shown here  depicting  the Types of  Mortgages as of May 31, 1999
of the USAA GNMA Trust to be:

Contruction Loans - 44.3%*; Fixed Rate Single Family - 41.1%*; and Project Loans
- - 14.1%*.

*  Percentages  are of the Net Assets in the  Portfolio and may or may not equal
   100%.



Another way to reduce prepayment risk is to own  lower-interest-rate  mortgages.
This sounds like a way to lower  income,  but remember  that  monthly  principal
payments are received at face value.  If you  purchase a  pass-through  security
below face value,  you realize a gain with each  paydown of  principal.  Monthly
paydowns, and even prepayments,  can actually enhance the Fund's return. Here is
the breakdown by coupon for fixed-rate home mortgage securities on May 31, 1999.



FIXED-RATE SF MORTGAGE POOL COMPOSITION BY COUPON RATE
- ------------------------------------------------------
A bar  graph  is  shown  here  illustrating  the  Fixed-Rate  SF  Mortgage  Pool
Composition  by Coupon Rate as of 05/31/99.  The vertical  axis shows the coupon
rate, and the horizontal axis shows the category percentage.

The values are:

Coupon Rate      5.5   6.0   6.5   6.75   7.0   7.5   8.0   8.5   9.0

Category %      14.7  25.4  26.1   3.3   16.1   5.6   6.3   1.4   1.3


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


See page 11 for a complete listing of the Porfolio of Investments.




GNMA TRUST PERFORMANCE

While past performance is no guarantee of future results,  from May 31, 1998, to
May 31, 1999, your Fund paid a dividend distribution yield(2) of 6.45% versus an
average  dividend  distribution  yield  of  5.83%  for  the  Lipper  GNMA  Funds
Average.(3)  During  the  twelve-month  period,  the  Trust's  share  price fell
$.32--to $10.00.  Over this period,  your Fund provided a total return of 3.15%,
below the Lipper  GNMA  Funds  Average  total  return of 3.62% for the same time
period.

Your Fund  received an Overall  Star Rating of 4 stars in the taxable  bond fund
category  from  Morningstar  Rating(TradeMark)  for  the  period  ended  May 31,
1999.(4)

The  strategy  of  investing  for low  prepayment  risk has the side  effect  of
increasing the volatility of mortgage  securities and funds that invest in them.
The GNMA Trust reacted as expected in the period of rising interest rates in the
second half of the fiscal year.  While the income was above  average,  the price
decline was significant.

In the short run, bond prices can be volatile. In the long run, bonds all mature
at par. We believe a high level of income,  over time, will overcome  short-term
price  volatility.  This is the strategy we have generally  followed for several
years and intend to follow in the future.


(2) 12-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.
(3) Refer  to the  bottom  of page 4 for the  Lipper  Average  definition.
(4) Past performance is no guarantee of future results.
    Morningstar proprietary ratings reflect historical risk-adjusted performance
    as of  May 31, 1999.  The  ratings   are  subject to  change  every   month.
    Morningstar  ratings  are  calculated  from  the  fund's 3-, 5-, and 10-year
    average  annual  returns in  excess of 90-day  Treasury  bill  returns  with
    appropriate   fee  adjustments,   and  a  risk  factor  that  reflects  fund
    performance below 90-day T-bill returns.  The Morningstar  overall rating is
    a weighted average of a fund's 3-, 5-, and  10-year ratings  as  applicable.
    The  USAA  GNMA Fund  received  4  stars  for  the 3-  and  5-year  periods,
    respectively.  The  top  10% of the  funds in a broad asset class receive  5
    stars, the next 22.5% receive 4 stars,  the next 35%  receive  3 stars,  the
    next  22.5% receive 2 stars, and the bottom  10%  receive 1 star.  The  fund
    was rated  among  1,536 and 1,085 funds in the  taxable bond  fund  category
    for the 3- and 5-year periods, respectively.










Distributions to Shareholders


The  following  per share  information  describes  the federal tax  treatment of
distributions  made during the fiscal year ended May 31, 1999. These figures are
provided for  information  purposes only and should not be used for reporting to
federal or state revenue  agencies.  Distributions for the calendar year will be
reported to you on Form 1099-DIV in January 2000.


                     Ordinary income*              $  .65
                                                   ======


* Includes  distribution of short-term  capital gains, if any, which are taxable
  as ordinary income.









Independent Auditors' Report


KPMG

The Shareholders and Board of Trustees

USAA INVESTMENT TRUST:

We have audited the accompanying statement of assets and liabilities,  including
the  portfolio  of  investments  of the USAA  GNMA  Trust,  a series of the USAA
Investment  Trust,  as of May 31, 1999, and the related  statement of operations
for the year then ended, the statements of changes in net assets for each of the
years in the two-year period then ended, and financial highlights,  presented in
note 9 to the  financial  statements,  for each of the  years  in the  five-year
period then ended. These financial  statements and financial  highlights are the
responsibility of the Company's management.  Our responsibility is to express an
opinion on these  financial  statements  and financial  highlights  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  and  financial
highlights are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements.  Our procedures included  confirmation of securities owned as of May
31, 1999,  by  correspondence  with the  custodian  and  brokers.  An audit also
includes assessing the accounting principles used and significant estimates made
by  management,   as  well  as  evaluating  the  overall   financial   statement
presentation.  We believe  that our audits  provide a  reasonable  basis for our
opinion.

In our opinion,  the financial  statements and financial  highlights referred to
above present fairly, in all material  respects,  the financial  position of the
USAA GNMA Trust as of May 31, 1999,  the results of its  operations for the year
then ended,  the changes in its net assets for each of the years in the two-year
period then ended,  and the  financial  highlights  for each of the years in the
five-year  period then ended, in conformity with generally  accepted  accounting
principles.


                                          KPMG LLP

San Antonio, Texas
July 2, 1999









USAA GNMA TRUST
PORTFOLIO OF INVESTMENTS
(IN THOUSANDS)

May 31, 1999



   Principal                                                             Market
    Amount                              Security                          Value
- --------------------------------------------------------------------------------
                     U.S. GOVERNMENT & AGENCY ISSUES (99.5%)

              Government National Mortgage Assn. I, Single Family (28.3%)
    $55,005   6.00%, 2/15/2029                                          $ 52,211
     54,931   6.50%, 4/15/2029                                            53,658
      6,834   6.75%, 5/15/2028                                             6,765
     13,131   7.00%, 4/15/2027 (b)                                        13,174
     10,082   8.00%, 1/15/2022 - 6/15/2023 (b)                            10,506
      2,683   8.50%, 6/15/2021 - 7/15/2022                                 2,849
      2,447   9.00%, 7/15/2021                                             2,624
- --------------------------------------------------------------------------------
                                                                         141,787
- --------------------------------------------------------------------------------

              Government National Mortgage Assn. II, Single Family (12.8%)
     32,825   5.50%, 12/20/2028 - 2/20/2029                               30,347
     19,867   7.00%, 5/20/2024 - 11/20/2025 (b)                           19,865
     11,247   7.50%, 10/20/2023 (b)                                       11,477
      2,287   8.00%, 12/20/2022                                            2,372
- --------------------------------------------------------------------------------
                                                                          64,061
- --------------------------------------------------------------------------------

              Government National Mortgage Assn. I, Construction Loan (44.3%)
     22,396   6.25%, 10/15/2001 (a)                                       21,090
      5,880   6.35%, 3/15/2001 (a)                                         5,542
      9,231   6.38%, 7/15/2001 (a)                                         8,719
      7,598   6.40%, 6/15/2000 - 10/15/2000 (a)                            7,262
     30,422   6.50%, 3/15/2001 - 5/15/2001 (a)                            28,932
     49,300   6.63%, 4/15/2002 (a)                                        47,243
      9,513   6.70%, 9/15/2000 (a)                                         9,223
      8,570   6.80%, 5/15/2000 (a)                                         8,452
      3,575   6.85%, 4/15/2000 (a)                                         3,526
     11,838   6.88%, 7/15/2000 (a)                                        11,782
     16,635   7.00%, 8/15/2000 (a)                                        16,692
     15,127   7.03%, 8/15/2000 (a)                                        15,205
      7,028   7.05%, 4/15/2000 (a)                                         6,889
     11,499   7.10%, 10/15/2000 (a)                                       11,625
     10,501   7.25%, 6/15/2000 (a)                                        10,716
      8,717   7.32%, 11/15/1999 (a)                                        8,939
- --------------------------------------------------------------------------------
                                                                         221,837
- --------------------------------------------------------------------------------

              Government National Mortgage Assn. I, Project Loan (14.1%)
      4,184   6.30%, 11/15/2033                                            4,018
     11,184   6.35%, 12/15/2031 (b)                                       10,774
     12,213   6.70%, 4/15/2039 (b)                                        12,081
      7,182   7.00%, 2/15/2039                                             7,218
     24,406   7.33%, 10/15/2030 (b)                                       25,029
     10,894   7.50%, 12/15/2030 (b)                                       11,319
- --------------------------------------------------------------------------------
                                                                          70,439
- --------------------------------------------------------------------------------
              Total U.S. government & agency issues (cost: $503,077)     498,124
- --------------------------------------------------------------------------------
                          REPURCHASE AGREEMENTS (18.9%)

     94,642   Bankers Trust Securities Corp., 4.78%, acquired on
              05/28/99 and due 06/01/99 at $94,692 (collateralized
              by a $18,307 U.S. Treasury Note, 8.875%, due 2/15/19;
              market value of $24,389 and a $50,000 U.S. Treasury Note,
              13.875%,  due 05/15/11;  market value of $72,409)
              (cost: $94,642) (b)                                         94,642
- --------------------------------------------------------------------------------
              Total investments (cost: $597,719)                        $592,766
================================================================================










USAA GNMA TRUST
NOTES TO PORTFOLIO OF INVESTMENTS


May 31, 1999



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 May 31, 1999,  the cost of  securities  purchased  on a delayed  delivery
basis was $99.6 million.  These securities 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 May 31, 1999,  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)

May 31, 1999


<S>                                                                                     <C>
ASSETS
   Investments in securities, at market value (identified cost of $503,077)             $498,124
   Repurchase agreements                                                                  94,642
   Cash                                                                                      346
   Receivables:
      Capital shares sold                                                                    267
      Interest                                                                             2,606
      Securities sold                                                                      4,927
                                                                                        --------
         Total assets                                                                    600,912
                                                                                        --------

LIABILITIES
   Securities purchased                                                                   99,573
   Capital shares redeemed                                                                   147
   USAA Investment Management Company                                                         53
   USAA Transfer Agency Company                                                               44
   Accounts payable and accrued expenses                                                      61
   Dividends on capital shares                                                               570
                                                                                        --------
         Total liabilities                                                               100,448
                                                                                        --------
            Net assets applicable to capital shares outstanding                         $500,464
                                                                                        ========

REPRESENTED BY:
   Paid-in capital                                                                      $514,694
   Accumulated net realized loss on investments                                           (9,277)
   Net unrealized depreciation of investments                                             (4,953)
                                                                                        --------
            Net assets applicable to capital shares outstanding                         $500,464
                                                                                        ========
   Capital shares outstanding, unlimited number of shares authorized,
      no par value                                                                        50,028
                                                                                        ========
   Net asset value, redemption price, and offering price per share                      $  10.00
                                                                                        ========


See accompanying notes to financial statements.
</TABLE>









USAA GNMA TRUST
STATEMENT OF OPERATIONS
(IN THOUSANDS)

Year ended May 31, 1999



Net investment income:
   Interest income                                                  $ 29,085
                                                                    --------
   Expenses:
      Management fees                                                    555
      Transfer agent's fees                                              493
      Custodian's fees                                                   106
      Postage                                                             43
      Shareholder reporting fees                                           7
      Trustees' fees                                                       4
      Registration fees                                                  115
      Professional fees                                                   31
      Other                                                               15
                                                                    --------
         Total expenses                                                1,369
                                                                    --------
            Net investment income                                     27,716
                                                                    --------
Net realized and unrealized gain (loss) on investments:
   Net realized gain                                                   2,274
   Change in net unrealized appreciation/depreciation                (18,135)
                                                                    --------
            Net realized and unrealized loss                         (15,861)
                                                                    --------
Increase in net assets resulting from operations                    $ 11,855
                                                                    ========


See accompanying notes to financial statements.










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

Years ended May 31,



                                                              1999        1998
                                                           ---------------------
From operations:
   Net investment income                                   $ 27,716    $ 22,165
   Net realized gain on investments                           2,274       2,227
   Change in net unrealized appreciation/depreciation
      of investments                                        (18,135)      9,784
                                                           --------------------
      Increase in net assets resulting from operations       11,855      34,176
                                                           --------------------
Distributions to shareholders from:
   Net investment income                                    (27,716)    (22,165)
                                                           --------------------
From capital share transactions:
   Proceeds from shares sold                                212,281     105,972
   Shares issued for dividends reinvested                    20,534      15,706
   Cost of shares redeemed                                  (94,018)    (64,959)
                                                           --------------------
      Increase in net assets from capital share
        transactions                                        138,797      56,719
                                                           --------------------
Net increase in net assets                                  122,936      68,730
Net assets:
   Beginning of period                                      377,528     308,798
                                                           --------------------
   End of period                                           $500,464    $377,528
                                                           ====================
Change in shares outstanding:
   Shares sold                                               20,571      10,386
   Shares issued for dividends reinvested                     1,992       1,540
   Shares redeemed                                           (9,126)     (6,369)
                                                           --------------------
      Increase in shares outstanding                         13,437       5,557
                                                           ====================


See accompanying notes to financial statements.










USAA GNMA TRUST
NOTES TO FINANCIAL STATEMENTS

May 31, 1999


(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 annual 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  which 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
year ended May 31, 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 May 31, 1999, the Fund had
capital loss  carryovers for federal income tax purposes of  approximately  $9.3
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 period ended May 31, 1999,  were $444.7 million
and $366.6 million, respectively.

Gross  unrealized  appreciation and depreciation of investments at May 31, 1999,
was $4.0 million and $9.0 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 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 is taking  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:


                                             Year Ended May 31,
                           ----------------------------------------------------
                              1999       1998       1997       1996      1995
                           ----------------------------------------------------
Net asset value at
   beginning of period     $  10.32   $   9.95   $   9.76   $  10.09   $   9.82
Net investment income           .65        .66        .69        .70        .72
Net realized and
   unrealized gain (loss)      (.32)       .37        .19       (.33)       .27
Distributions from net
   investment income           (.65)      (.66)      (.69)      (.70)      (.72)
                           -----------------------------------------------------
Net asset value at
   end of period           $  10.00   $  10.32   $   9.95   $   9.76   $  10.09
                           ====================================================
Total return (%)*              3.15      10.65       9.23       3.65      10.54
Net assets at
   end of period (000)     $500,464   $377,528   $308,798   $301,589   $265,571
Ratio of expenses to
   average net assets (%)       .31        .30        .30        .32        .32
Ratio of net investment
   income to average net
   assets (%)                  6.24       6.48       6.93       6.90       7.34
Portfolio turnover (%)        64.93      60.85      77.82     127.77      93.78

* Assumes reinvestment of all dividend income distributions during the period.










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
Call toll free - Central Time
Monday - Friday 7:30 a.m. to 8:00 p.m.
Saturdays 8:30 a.m. to 5:00 p.m.

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 Touchtone phones only)
For account balance, last transaction or fund prices
1-800-531-8777, (in San Antonio) 498-8777






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