USAA INVESTMENT TRUST
N-30D, 1999-01-27
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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:
         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)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(1)               Very high               $3,000
 First Start Growth                Moderate to high        $3,000
 Gold(1)                           Very high               $3,000
 Growth                            Moderate to high        $3,000
 Growth & Income                   Moderate                $3,000
 International(1)                  Moderate to high        $3,000
 S&P 500 (Registered Trademark)
  Index(2)                         Moderate                $3,000
 Science & Technology(5)           Very high               $3,000
 World Growth(1)                   Moderate to high        $3,000
       
 ASSET ALLOCATION            
===============================================================================
 Balanced Strategy(1)              Moderate                $3,000
 Cornerstone Strategy(1)           Moderate                $3,000
 Growth and Tax
  Strategy(3)                      Moderate                $3,000
 Growth Strategy(1)                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(3)                      Moderate                $3,000
 Intermediate-Term(3)              Low to moderate         $3,000
 Short-Term(3)                     Low                     $3,000
 State Bond Income(3)**            Moderate                $3,000
       
 MONEY MARKET        
===============================================================================
 Money Market(4)                   Very low                $3,000
 Tax Exempt
  Money Market(3),(4)              Very low                $3,000
 Treasury Money
  Market Trust(4)                  Very low                $3,000
 State Money Market(3),(4)**       Very low                $3,000

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

(2)  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.

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

(4)  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.

(5)  This 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,  and are
subject to investment risks, and may lose value.

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








Message from the President

[Photograph of the President and Vice Chairman of the Board, Michael J. C. Roth,
CFA, appears here.]

Since my last message to  Investment  Trust  shareholders,  the stock market has
reminded us that intense emotions are part of the investment process. In August,
the  unraveling  of markets  around the world was  downright  scary.  Huge daily
drops,  the rampage into treasury bonds while other income markets dried up, and
the antics of huge hedge funds made for confusion  and fear.  At such times,  it
becomes very hard for people to remember the long-term  plans they have made for
their portfolios.

A scant three months later,  stock markets have recouped losses and bond markets
have settled down. August looks like a momentary aberration. With the retreat of
fear,  we are now seeing  something  the  financial  press has tagged  "Internet
stocks."  These are various  companies,  going public for the first time,  whose
business is closely  tied to Internet  commerce.  Some have soared to prices ten
times their  initial  offering,  even though they have little or no earnings and
traditional  analysts  can detect  little to support such lofty  prices.  In the
1600s, investors got the idea that tulip bulbs, which Dutch traders brought home
on their  voyages,  were  highly  valuable  and bid their  prices to  incredible
levels.  Those prices  collapsed and the word "tulip" took on a special  meaning
for  investment  professionals.  The tulip  craze  became a classic  example  of
irrational investor behavior. When I watch the Internet IPOs, I think "Tulip."

This tells me that emotions can run both ways, from panic to euphoria,  and make
people forget their long-term  investment  plans. But, you need those plans most
of all when the emotions are  rampant.  Trading in calm markets  prepares you to
avoid trading during raging markets.

Sincerely,

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





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

Although none of the investments mentioned are guaranteed or insured, government
bonds are  backed by the full faith and  credit of the U.S.  Government.  Common
stocks are  considered  to have the most risk,  followed by corporate  bonds and
government bonds. All of these vehicles are subject to tax. If held to maturity,
bonds  offer a fixed  rate of  return  and fixed  principal  value.  Return  and
principal value of an investment in stocks will fluctuate.

Past performance is no guarantee of future results.




Investment Review

USAA GNMA TRUST

OBJECTIVE: Provide investors with a high level of current income consistent with
preservation  of principal by investing in  securities  backed by the full faith
and credit of the U.S. Government.

TYPES OF  INVESTMENTS:  At least 65% of the Fund's  total assets are invested in
Government National Mortgage Association (GNMA) pass-through  certificates.  The
remaining  assets of the Fund are  invested in other  obligations  backed by the
full faith and credit of the U.S. Government.

- --------------------------------------------------------------------------------
                                           11/30/98             5/31/98
- --------------------------------------------------------------------------------
  Net Assets                            $448.0 Million       $377.5 Million
  Net Asset Value Per Share                 $10.42               $10.32
- --------------------------------------------------------------------------------
AVERAGE ANNUAL TOTAL RETURNS AND 30-DAY SEC YIELD* AS OF 11/30/98
- --------------------------------------------------------------------------------
         5/31/98                             Since Inception     30-Day
        11/30/98(+)   1 Year     5 Years        on 2/1/91       SEC Yield
          4.22%        9.17%      7.52%           8.02%           6.34%
- --------------------------------------------------------------------------------


* 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 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 11/30/98. 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            10,282
11/30/91        10,932               11,173            11,022
05/31/92        11,382               11,651            11,483
11/30/92        11,838               12,128            11,917
05/31/93        12,594               12,765            12,539
11/30/93        12,731               12,969            12,775
05/31/94        12,677               12,721            12,467
11/30/94        12,778               12,750            12,427
05/31/95        14,013               14,193            13,747
11/30/95        14,818               14,898            14,407
05/31/96        14,524               14,953            14,344
11/30/96        15,575               16,007            15,310
05/31/97        15,865               16,375            15,555
11/30/97        16,759               17,292            16,417
05/31/98        17,554               17,905            17,048
11/30/98        18,296               18,378            17,596

Data since inception on 2/01/91 through 11/30/98




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 the Portfolio Manager, Kenneth E. Willmann, CFA, appears here.]

GNMA TRUST PERFORMANCE

While past performance is no guarantee of future results,  from May 31, 1998, to
November 30, 1998, your Fund paid an annualized dividend  distribution  yield(1)
of 6.34%  versus the Lipper GNMA Funds  Average(2)  of 5.90% for the 51 funds in
the category.  During the six-month period, the Trust's share price rose $.10 to
$10.42. Over this period, your Fund provided a total return of 4.22%, well above
the Lipper GNMA Funds Average total return of 3.24% for the same time period.

The Fund received a 5-star overall rating out of 1,496 funds in the taxable bond
fund category from Morningstar as of November 30, 1998. It also received 4 and 5
stars  among  1,496 and 964  taxable  bond funds for the 3- and 5-year  periods,
respectively.(3)


(1) Dividend yield is computed  by  dividing  income  dividends  paid during the
previous 6 months by the latest  month-end net asset value  adjusted for capital
gain distributions and annualizing the result.
(2) Refer to page 4 for the Lipper Average definition.
Past  performance  is no guarantee of future results.
(3) Morningstar proprietary ratings reflect historical risk-adjusted performance
through  November  30,  1998.  The ratings are  subject to change  monthly.  The
ratings are calculated  from the Fund's 3-, 5-, and 10-year average annual total
returns,  as  applicable,  in  excess  of  90-day  Treasury  bill  returns  with
appropriate fee  adjustments,  and a risk factor that reflects fund  performance
below  90-day  Treasury  bill  returns.  There is a 3-year  minimum  performance
requirement  before a fund is rated.  Overall rating is a weighted  average of a
fund's 3-, 5-, and 10-year  ratings,  as applicable.  The top ten percent of the
funds in a rating  category  receive five stars and the next 22.5%  receive four
stars.


INTEREST RATE MARKET

Interest rates were generally  lower on November 30, 1998, than they were at the
beginning of the six-month period. The absolute low points occurred in the first
week of October, with rates rising somewhat in October and November.

This pattern may be seen in the graph below.


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 5/31/98 to 11/30/98. 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            6.41%                         4.98%
11/30/98            6.36%                         4.71%


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.

Besides the fact that both lines show a similar pattern, the most striking thing
is how much more volatile the Treasury Note is than the mortgage securities.  On
October 5, 1998, the 10-year  Treasury Note yield declined to 4.16%.  Yes, 4.16%
is correct! Treasury Notes hit yield levels not seen in over 30 years!

CHANGING RELATIONSHIPS

Mortgage  securities followed the trend but in a more gentle manner. What causes
the  relationship to change?  Why does the yield of Treasury Notes drop and rise
so much more than  mortgages?  Let's begin by  discussing  what is going on with
U.S. Treasury Notes.

While the U.S. economy is currently in good shape, many of the world's economies
are not. You have probably  heard of the economic  collapses in Asia and Russia.
It appears that Latin America may be poised to follow.  These collapses have led
to business  failures,  declining  employment and wages,  credit  crunches,  and
deflation of prices. In short, many of the world's economies look a lot like the
early 1930s in the U.S.

The economies of almost all countries in the world are increasingly  intertwined
by technology  and the expansion of world trade.  Many people  believe that it's
only a matter of time,  and perhaps not much time,  before the U.S.  and Western
Europe are dragged into this  scenario.  The Federal  Reserve Board in the U.S.,
which has been the leader in the fight against inflation for years, has recently
turned its  attention to worries  about  recession.  On September  29, 1998,  it
lowered  short-term  interest  rates .25% to 5.25%,  the first  change in over a
year.  It lowered  rates .25% again on October 15, 1998,  and then repeated that
action on November  17,  1998.  The  lowering  of  interest  rates is thought to
stimulate  the economy.  Many  investors  around the world,  particularly  those
outside  of  this  country,  view  U.S.  Treasury  securities  as  a  very  safe
investment.  Therefore,  demand  was  very  high for  Treasury  bonds as a haven
against future economic turmoil and deflation brought on by severe recession. As
a result,  prices of these bonds  soared,  which in turn,  caused yields to fall
very rapidly. After the initial panic buying, some semblance of stability seeped
into the market place.

While  GNMA  securities  offer the same  ultimate  credit  quality  as  Treasury
securities,  the fact that  mortgages  can  usually be prepaid any time leads to
uncertainty  in the timing and size of monthly cash flows.  This  uncertainty is
referred  to as  "prepayment  risk" and leads  both to higher  yields  and lower
volatility.

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.  This  has led me to  spread  prepayment  risk as seen in the  graph
below.


TYPES OF MORTGAGES
- ------------------

A pie chart is shown here  depicting  the Types of  Mortgages as of November 30,
1998 of the USAA GNMA Trust to be:

Contruction Loans - 51.0%*; Fixed Rate SF - 45.8%*; and Project Loans - 14.6%*.

*  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.
While this sounds like a way to lower income,  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.  The
breakdown by coupon for  fixed-rate  home  mortgage  securities  on November 30,
1998, is seen below.



FIXED-RATE SF MORTGAGE POOL COMPOSITION BY COUPON RATE
- ------------------------------------------------------
A graph is shown here  illustrating  the Fixed-Rate SF Mortgage Pool Composition
by Coupon Rate as of 11/30/98.  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 %      3.0  24.3  32.3   3.5   18.9   6.9   7.7   1.8   1.6


The graph also shows the average coupon rate to be 6.7%.



See page 9 for a complete listing of the Portfolio of Investments.





USAA GNMA TRUST
PORTFOLIO OF INVESTMENTS
(IN THOUSANDS)

November 30, 1998
(Unaudited)

   Principal                                                           Market
     Amount                   Security                                 Value
- --------------------------------------------------------------------------------
                     U.S. GOVERNMENT & AGENCY ISSUES (111.4%)

               Government National Mortgage Assn. I, Single Family (9.4%)
   $   6,968   6.75%, 5/15/2028                                         $  7,067
      15,013   7.00%, 4/15/2027                                           15,387
      12,120   8.00%, 1/15/2022 - 6/15/2023                               12,645
       3,447   8.50%, 6/15/2021 - 7/15/2022                                3,687
       3,052   9.00%, 7/15/2021                                            3,274
- --------------------------------------------------------------------------------
                                                                          42,060
- --------------------------------------------------------------------------------
               Government National Mortgage Assn. II, Single Family (36.4%)
       6,400   5.50%, 12/20/2028 (a)                                       6,170
      50,593   6.00%, 9/20/2028 (b)                                       49,958
      65,789   6.50%, 8/20/2025 - 10/20/2028 (b)                          66,215
      23,018   7.00%, 5/20/2024 - 11/20/2025 (b)                          23,459
      13,819   7.50%, 10/20/2023 (b)                                      14,222
       3,021   8.00%, 12/20/2022                                           3,139
- --------------------------------------------------------------------------------
                                                                         163,163
- --------------------------------------------------------------------------------
               Government National Mortgage Assn. I, Construction Loan (51.0%)
      22,396   6.25%, 10/15/2001 (a)                                      22,200
       7,598   6.40%, 6/15/2000 - 10/15/2000 (a)                           7,524
      21,915   6.50%, 6/15/2000 (a)                                       21,956
      49,300   6.63%, 4/15/2002 (a)                                       49,847
      21,784   6.70%, 2/15/2000 - 9/15/2000 (a)                           22,006
       8,570   6.80%, 5/15/2000 (a)                                        8,768
       3,575   6.85%, 4/15/2000 (a)                                        3,670
      11,838   6.88%, 7/15/2000 (a)                                       12,180
      24,124   7.00%, 8/15/1999 - 8/15/2000 (a)                           24,987
      15,127   7.03%, 8/15/2000 (a)                                       15,720
       7,028   7.05%, 4/15/2000 (a)                                        7,316
      11,499   7.10%, 10/15/2000 (a)                                      12,013
      10,501   7.25%, 6/15/2000 (a)                                       11,082
       8,717   7.32%, 11/15/1999 (a)                                       9,229
- --------------------------------------------------------------------------------
                                                                         228,498
- --------------------------------------------------------------------------------
               Government National Mortgage Assn. I, Project Loan (14.6%)
       4,200   6.30%, 11/15/2033                                           4,179
      11,225   6.35%, 12/15/2031                                          11,077
       7,847   6.63%, 10/15/2033                                           7,930
       5,069   6.75%, 11/15/2028                                           5,153
      24,498   7.33%, 10/15/2030 (b)                                      25,384
      10,933   7.50%, 12/15/2030                                          11,472
- --------------------------------------------------------------------------------
                                                                          65,195
- --------------------------------------------------------------------------------
               Total U.S. government & agency issues (cost: $486,999)    498,916
- --------------------------------------------------------------------------------
                        REPURCHASE AGREEMENTS (17.1%)

      76,892   First Chicago Corp., 5.20%, acquired 11/30/98 and due 
                 12/01/98 at $76,903 (collateralized by a $50,000 U.S.
                 Treasury Note, 7.875%, due 11/15/04; market value of 
                 $58,117 and a $19,415 U.S. Treasury Note, 6.375%, due
                 3/31/01; market value of $20,350) (cost: $76,892)        76,892
- --------------------------------------------------------------------------------
               Total investments (cost: $563,891)                       $575,808
================================================================================





NOTES TO PORTFOLIO OF INVESTMENTS


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, 1998, the cost of securities purchased on a delayed delivery
basis was $137.7  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, 1998,  these  securities  were  segregated  to cover delayed
delivery purchases.


See accompanying notes to financial statements.






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

November 30, 1998
(Unaudited)



ASSETS
   Investments in securities, at market value (identified 
     cost of $486,999)                                              $ 498,916
   Repurchase agreements                                               76,892
   Cash                                                                   374
   Receivables:
      Capital shares sold                                                 160
      Interest                                                          2,759
      Securities sold                                                   7,673
                                                                    ---------
         Total assets                                                 586,774
                                                                    ---------

LIABILITIES
   Securities purchased                                               137,712
   Capital shares redeemed                                                335
   USAA Investment Management Company                                      45
   USAA Transfer Agency Company                                            39
   Accounts payable and accrued expenses                                   29
   Dividends on capital shares                                            606
                                                                    ---------
         Total liabilities                                            138,766
                                                                    ---------
            Net assets applicable to capital shares outstanding     $ 448,008
                                                                    =========

REPRESENTED BY:
   Paid-in capital                                                  $ 442,438
   Accumulated net realized loss on investments                        (6,347)
   Net unrealized appreciation of investments                          11,917
                                                                    ---------
            Net assets applicable to capital shares outstanding     $ 448,008
                                                                    =========
   Capital shares outstanding, unlimited number of shares 
      authorized, no par value                                         42,990
                                                                    =========
   Net asset value, redemption price, and offering price per share  $   10.42
                                                                    =========


See accompanying notes to financial statements.





USAA GNMA TRUST
STATEMENT OF OPERATIONS
(IN THOUSANDS)

Six-month period ended November 30, 1998
(Unaudited)



Net investment income:
   Interest income                                                  $  13,714
                                                                    ---------
   Expenses:
      Management fees                                                     240
      Transfer agent's fees                                               219
      Custodian's fees                                                     47
      Postage                                                              17
      Shareholder reporting fees                                            8
      Trustees' fees                                                        2
      Registration fees                                                    65
      Professional fees                                                    13
      Other                                                                 6
                                                                    ---------
         Total expenses                                                   617
                                                                    ---------
            Net investment income                                      13,097
                                                                    ---------
Net realized and unrealized gain on investments:
   Net realized gain                                                    5,204
   Change in net unrealized appreciation/depreciation                  (1,265)
                                                                    ---------
            Net realized and unrealized gain                            3,939
                                                                    ---------
Increase in net assets resulting from operations                    $  17,036
                                                                    =========



See accompanying notes to financial statements.





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

Six-month period ended November 30, 1998
and Year ended May 31, 1998
(Unaudited)

                                                        11/30/98      5/31/98
                                                       ------------------------

From operations:
   Net investment income                               $  13,097     $  22,165
   Net realized gain on investments                        5,204         2,227
   Change in net unrealized appreciation/depreciation
      of investments                                      (1,265)        9,784
                                                       ------------------------
      Increase in net assets resulting from operations    17,036        34,176
                                                       ------------------------
Distributions to shareholders from:
   Net investment income                                 (13,097)      (22,165)
                                                       ------------------------
From capital share transactions:
   Proceeds from shares sold                              89,670       105,972
   Shares issued for dividends reinvested                  9,652        15,706
   Cost of shares redeemed                               (32,781)      (64,959)
                                                       ------------------------
      Increase in net assets from capital share 
        transactions                                      66,541        56,719
                                                       ------------------------
Net increase in net assets                                70,480        68,730
Net assets:
   Beginning of period                                   377,528       308,798
                                                       ------------------------
   End of period                                       $ 448,008     $ 377,528
                                                       ========================
Change in shares outstanding:
   Shares sold                                             8,631        10,386
   Shares issued for dividends reinvested                    926         1,540
   Shares redeemed                                        (3,158)       (6,369)
                                                       ------------------------
      Increase in shares outstanding                       6,399         5,557
                                                       ========================


See accompanying notes to financial statements.





USAA GNMA TRUST
NOTES TO FINANCIAL STATEMENTS

November 30, 1998
(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 by investing
in securities backed by the full faith and credit of the U.S.  Government.  USAA
Investment  Management  Company (the Manager) seeks to achieve this objective by
investing  at least  65% of the  Fund's  total  assets  in  Government  National
Mortgage Association (GNMA) pass through certificates.

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 two joint short-term  revolving
loan  agreements  totaling  $850  million,  one with  USAA  Capital  Corporation
(CAPCO),  an affiliate of the Manager ($750 million  uncommitted),  and one with
NationsBank  of  Texas,  N.A.  ($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 its agreement 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  NationsBank,
the Fund may borrow from NationsBank an amount which,  when added to outstanding
borrowings  under the CAPCO  agreement,  does not exceed 25% of the Fund's total
assets at NationsBank's borrowing rate plus a markup. The Fund had no borrowings
under either of these agreements  during the six-month period ended November 30,
1998.


(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, 1998, the
Fund  had  capital  loss   carryovers   for  federal   income  tax  purposes  of
approximately  $6.3 million  which,  if not offset by subsequent  capital gains,
will  expire  between  2001 - 2005.  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, 1998 were
$208.5 million and $149.2 million, respectively.

Gross  unrealized  appreciation  and depreciation of investments at November 30,
1998 was $12.4 million and $494,000, 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 $26 per  shareholder  account  plus
out-of-pocket  expenses.  Effective  January 1, 1999,  the annual charge will be
$28.50.

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

USAA Investment Management Company is indirectly wholly owned by United Services
Automobile  Association  (the  Association),   a  large,  diversified  financial
services  institution.  At November 30, 1998, the Association and its affiliates
owned 432,700 shares (1.0%) of the Fund.

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) FINANCIAL HIGHLIGHTS

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

                    Six-month                                       Eight-month
                  Period Ended                                      Period Ended
                   November 30,        Year Ended May 31,               May 31,
                  --------------------------------------------------------------
                      1998       1998      1997      1996      1995      1994
                  --------------------------------------------------------------
 Net asset value
   at beginning
   of period       $  10.32  $   9.95  $   9.76  $  10.09  $   9.82  $  10.37
Net investment
   income               .33       .66       .69       .70       .72       .49
Net realized and
   unrealized
   gain (loss)          .10       .37       .19      (.33)      .27      (.55)
Distributions from
   net investment
   income              (.33)     (.66)     (.69)     (.70)     (.72)     (.49)
                  --------------------------------------------------------------
Net asset value at
   end of period   $  10.42  $  10.32  $   9.95  $   9.76  $  10.09  $   9.82
                  ==============================================================
Total return (%) *     4.22     10.65      9.23      3.65     10.54      (.66)
Net assets at end
   of period (000) $448,008  $377,528  $308,798  $301,589  $265,571  $261,251
Ratio of expenses
   to average
   net assets (%)       .30(a)    .30       .30       .32       .32       .31(a)
Ratio of net 
   investment 
   income to 
   average net 
   assets (%)          6.36(a)   6.48      6.93      6.90      7.34      7.20(a)
Portfolio 
   turnover (%)       31.32     60.85     77.82    127.77     93.78     90.05


 * 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 Peat Marwick LLP
112 East Pecan, Suite 2400
San Antonio, Texas 78205

Telephone Assistance Hours
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 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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