USAA MUTUAL FUND INC
N-30D, 1999-09-27
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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:
         Independent Auditors' Report                                   8
         Portfolio of Investments                                       9
         Notes to Portfolio of Investments                             12
         Statement of Assets and Liabilities                           13
         Statement of Operations                                       14
         Statements of Changes in Net Assets                           15
         Notes to Financial Statements                                 16






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  Science &
Technology Fund, 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
 Small Cap Stock             Very high                              $3,000
 World Growth                Moderate to high                       $3,000
- --------------------------------------------------------------------------------
ASSET ALLOCATION
- --------------------------------------------------------------------------------
 Balanced Strategy           Moderate                               $3,000
 Cornerstone Strategy        Moderate                               $3,000
 Growth and Tax Strategy     Moderate                               $3,000
 Growth Strategy             Moderate to high                       $3,000
 Income Strategy             Low to moderate                        $3,000
- --------------------------------------------------------------------------------
INCOME - TAXABLE
- --------------------------------------------------------------------------------
 GNMA                        Low to moderate                        $3,000
 High-Yield Opportunities    High                                   $3,000
 Income                      Moderate                               $3,000
 Income Stock                Moderate                               $3,000
 Intermediate-Term Bond      Low to moderate                        $3,000
 Short-Term Bond             Low                                    $3,000
- --------------------------------------------------------------------------------
INCOME - TAX EXEMPT
- --------------------------------------------------------------------------------
 Long-Term                   Moderate                               $3,000
 Intermediate-Term           Low to moderate                        $3,000
 Short-Term                  Low                                    $3,000
 State Bond Income           Moderate                               $3,000
- --------------------------------------------------------------------------------
MONEY MARKET
- --------------------------------------------------------------------------------
 Money Market                Very low                               $3,000
 Tax Exempt Money Market     Very low                               $3,000
 Treasury Money Market
    Trust                    Very low                               $3,000
 State Money Market          Very low                               $3,000
- --------------------------------------------------------------------------------


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

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

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

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

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

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

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


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

Year 2000 Readiness Disclosure

As we rapidly approach the year 2000, an interesting market picture is emerging.
Many of our  shareholders  have had questions about the "year 2000 problem," and
we have spent a lot of time,  energy, and money on it. We believe that we -- and
your funds -- are in good shape  because we have treated the problem  seriously.
We also  believe  that we -- and your funds -- are not alone in that  effort.  I
always like to look at what the market tells us about such things.

Many dire  predictions have been around for years now. Last summer, I asked some
business  associates  for the names of some  systems  people at major  financial
firms to whom I could speak  about Y2K.  One of these was the head of the effort
at a major credit card institution.  He was more dire in his outlook than anyone
else I spoke to. One prediction was, "By the second quarter of 1999, the federal
government  will  intervene  in the  financial  markets and the  banking  system
because of the spreading panic." It is mid-September.  The financial markets are
choppy because Fed Chairman Greenspan keeps talking about inflation, but so far,
no  panic.  Not even a hint.  As for  other  predictions,  we find  that the Y2K
problem is being taken very seriously by firms with which we do business or with
whom we invest.  We cannot  assure that nothing will go wrong,  but we are quite
sure that these  firms have made a serious  effort to  confront  it,  just as we
have. As an added safeguard,  we've developed, and continue to test, contingency
plans designed to help ensure continuous service in the event of a Y2K problem.

Early January will be very interesting.  I have cancelled all employee vacations
from  mid-December  through  mid-January.  We will be here for you.  Because our
computers will be doing the normal year-end  processing on Saturday,  January 1,
2000, we probably  won't be able to give you year-end  figures for your accounts
until sometime that afternoon. We plan to have some employees in from noon until
6 p.m.  CST on New Year's Day,  and Sunday,  January 2, we will be in the office
from 8 a.m.  until 8 p.m.  CST.  With  patience,  because we expect  heavy phone
traffic in general,  you should be able to reach us. We will also have our voice
response system (VRS) and Web site up. There may be some problems,  but I expect
we will be able to wish you a "Happy New Year."

Sincerely,

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


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










Investment Review

USAA SCIENCE & TECHNOLOGY FUND

OBJECTIVE: Long-term capital appreciation.

TYPES OF  INVESTMENTS:  Invests  principally  in equity  securities of companies
expected to benefit from the development and use of scientific and technological
advances and improvements.

- --------------------------------------------------------------------------------
                                           7/31/98              7/31/99
- --------------------------------------------------------------------------------
  Net Assets                            $111.3 Million       $258.0 Million
  Net Asset Value Per Share                 $11.17               $15.18
- --------------------------------------------------------------------------------
Average Annual Total Returns as of 7/31/99
- --------------------------------------------------------------------------------
            1 Year                         Since Inception on 8/1/97
            35.90%                                  23.21%
- --------------------------------------------------------------------------------

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





                        CUMULATIVE PERFORMANCE COMPARISON

A chart in the form of a line graph appears here, illustrating the comparison of
a $10,000 hypothetical investment in the USAA Science & Technology Fund, the S&P
500 Index,  and the Lipper Science & Technology  Funds Average for the period of
08/01/97 through 07/31/99. The data points from the graph are as follows:


               USAA Science &            S&P 500          Lipper Science &
               Technology Fund            Index            Tech Funds Avg.
               ---------------           -------          ----------------

08/01/97         $10,000                 $10,000             $10,000
08/97              9,380                   9,440              10,004
09/97              9,800                   9,957              10,547
10/97              9,200                   9,625               9,564
11/97              9,240                  10,070               9,457
12/97              9,070                  10,243               9,185
01/98              9,450                  10,356               9,407
02/98             10,540                  11,102              10,470
03/98             10,660                  11,670              10,732
04/98             11,020                  11,790              11,159
05/98             10,390                  11,588              10,363
06/98             11,170                  12,058              11,160
07/98             11,170                  11,931              10,978
08/98              9,240                  10,207               8,761
09/98             10,100                  10,861               9,888
10/98             10,870                  11,743              10,536
11/98             11,660                  12,455              11,936
12/98             13,300                  13,172              13,909
01/99             14,360                  13,723              16,110
02/99             13,550                  13,296              14,656
03/99             14,340                  13,828              16,339
04/99             14,450                  14,364              16,897
05/99             14,320                  14,025              16,586
06/99             15,740                  14,803              18,534
07/99             15,180                  14,341              18,155

Data since inception on 8/1/97 through 7/31/99


The graph illustrates the comparison of a $10,000 hypothetical investment in the
USAA  Science &  Technology  Fund to the S&P 500 Index and the Lipper  Science &
Technology  Funds  Average,  an average  performance  level of all  science  and
technology  funds,  as  reported  by  Lipper  Analytical   Services,   Inc.,  an
independent  organization that monitors the performance of mutual funds. 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.










Message from the Manager

[Photograph of the Portfolio Manager, Curt Rohrman, CFA, appears here.]

STRATEGY

Computer  technology and the Internet are changing the way people and businesses
around the world operate,  communicate, and transact. But technological advances
that improve our lives are not  restricted  to computers  and  electronics.  Our
lives are  being  enhanced  and  extended  by rapid  advances  in such  areas as
pharmaceuticals,  medical  devices,  biotechnology,  agriculture,  and oil field
service. For this reason, your USAA Science & Technology Fund invests in a broad
spectrum of companies  benefiting from the development and use of scientific and
technological advances.

We  believe  a  broad-based   approach  to  technology  may  provide   long-term
performance  returns  comparable to the return of funds  focused on  traditional
computer technology -- but with lower volatility due to greater diversification.
In fact,  over the past 30  years,  based  upon our  research,  health  care and
technology  stocks  have posted  nearly  identical  performance:  12.1% per year
versus  12.2% per year,  respectively.  Yet monthly  returns for the two sectors
have a relatively low correlation,  highlighting the diversification benefits of
combining health care and technology in a single portfolio.


PERFORMANCE

From July 31,  1998,  to July 31, 1999,  your USAA  Science & Technology  Fund's
total return was 35.90%,  versus the Lipper  Science & Technology  Funds Average
return of 66.42%.  Our heavy  weightings  in  semiconductors  and  semiconductor
capital  equipment  stocks such as Analog  Devices,  Applied  Materials,  Linear
Technology,  Teradyne, and Texas Instruments helped performance. Other positions
posting  strong  gains  include  America  Online,  Cisco  Systems,  First  Data,
Hewlett-Packard,  and Rational  Software.  However,  our exposure to health care
held back performance.  During the year,  technology stocks  outperformed health
care stocks by an incredible 51.5 percentage points. We believe such a disparity
will not continue.

OUTLOOK

Our near-term  outlook for the overall stock market is more cautious than normal
as we believe  steady  declines in  inflation  may be over.  Without  additional
reductions  in  inflation,  price/earnings  ratios (P/Es) are unlikely to expand
further,  and  may  even  contract.  We do not  anticipate  a  material  rise in
inflation, simply a stabilization of inflation rates near current levels.

Our  long-term  outlook for the  overall  stock  market  remains  bullish.  U.S.
competitiveness  has never  been  stronger.  Examples  are clear  leadership  in
computer  technology,  communications  equipment,  pharmaceuticals,  and medical
devices.

Our long-term  outlook  specific to the technology and health care industries is
as bullish  as ever.  We see no  credible  threat on the  horizon  to  corporate
America's dominance in innovation and knowledge capital.  Rewards for successful
innovation in this country are unmatched and central to sustained  leadership in
technology and health care.  Advances in software,  networking,  semiconductors,
and the  Internet  are  driving  persistent  improvements  in  productivity  and
profitability.   Demographics,   research   efficiencies,   expedited   approval
processes, and global harmonization of approval processes provide an outstanding
environment for pharmaceuticals and medical devices.

Our  near-term  outlook  for  the  technology  and  health  care  industries  is
relatively  cautious for several reasons.  First,  valuations of many technology
stocks  seem to  discount  better  than  best-case  earnings  growth.  We do not
typically obsess over any one company's or sector's  valuation per se. But we do
become  concerned when high P/Es seem to reflect  widespread  confidence  that a
company or sector  can  continually  beat  earnings  expectations  by a material
amount.  Semiconductor  stocks trading at 35 to 65 times the earnings  estimates
for the year 2000 fit such a description.

Second,  technology stocks have had an incredible run. Although past performance
is no guarantee of future results,  the technology  portion of the S&P 500 Index
has soared 92.7% since the market's low point on October 8, 1998. Investors will
normally take some profits after such an increase.

Third,  Y2K  remains  a  concern  over  the next  six to nine  months.  Domestic
corporations  have  made  considerable  progress  in Y2K  remediation.  However,
foreign corporations have been much more complacent in addressing the issue, and
even the most  prepared  corporation  is likely to reduce  spending  on computer
systems and  software  code during the last couple of months of the year.

Last,  concerns  about  pharmaceutical  pricing  pressure  build as the  federal
government  explores  options  for  providing  pharmaceutical  coverage  to  the
elderly. We still find significant price controls unlikely.  Price controls will
only  serve to hamper  development  spending  within  the  industry,  eventually
causing an inadvertent  reduction in new pharmaceuticals -- a result in no one's
best interest.


Past performance is no guarantee of future results.

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






- -----------------------------------
       Top 10 Equity Holdings
         (% of Net Assets)
- -----------------------------------
Microsoft                      3.6
Hewlett-Packard                3.3
America Online                 3.2
Texas Instruments              3.2
Oracle                         3.0
Cisco Systems                  3.0
LM Ericsson Telephone Co. ADR  3.0
Pfizer                         3.0
MCI WorldCom                   2.9
First Data                     2.9
- -----------------------------------



- -----------------------------------
        Top 10 Industries
        (% on Net Assets)
- -----------------------------------
Computer Software & Service    12.8
Electronics-Semiconductors     10.5
Health Care-Diversified         9.3
Drugs                           7.5
Communication Equipment         6.8
Computer-Hardware               5.5
Retail-Drugs                    5.0
Medical Products & Supplies     4.5
Equipment-Semiconductors        3.9
Internet Services               3.6
- -----------------------------------


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












Independent Auditors' Report

KPMG

The Shareholders and Board of Directors

USAA SCIENCE & TECHNOLOGY FUND:

We have audited the accompanying statement of assets and liabilities,  including
the portfolio of investments of the USAA Science & Technology  Fund, a series of
USAA Mutual  Fund,  Inc.,  as of July 31,  1999,  and the related  statement  of
operations for the year then ended,  the statements of changes in net assets and
financial highlights,  presented in note 8 to the financial statements, for each
of the years in the two-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 July
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  Science  &  Technology  Fund as of  July  31,  1999,  the  results  of its
operations  for the year then  ended,  the  changes  in its net  assets  and the
financial highlights for each of the years in the two-year period then ended, in
conformity with generally accepted accounting principles.

                                                        KPMG LLP

San Antonio, Texas
September 3, 1999









USAA SCIENCE & TECHNOLOGY FUND
PORTFOLIO OF INVESTMENTS

July 31, 1999

                                                                        Market
    Number                                                              Value
  of Shares                   Security                                  (000)
- --------------------------------------------------------------------------------

                              Common Stocks (91.1%)
            Communication Equipment (6.8%)
  240,000   LM Ericsson Telephone Co. ADR                               $  7,695
   91,000   Lucent Technologies, Inc.                                      5,921
   62,000   Tellabs, Inc.*                                                 3,817
- --------------------------------------------------------------------------------
                                                                          17,433
- --------------------------------------------------------------------------------
            Computer - Hardware (5.5%)
  135,000   Dell Computer Corp.*                                           5,518
   82,000   Hewlett-Packard Co.                                            8,584
- --------------------------------------------------------------------------------
                                                                          14,102
- --------------------------------------------------------------------------------
            Computer - Networking (3.0%)
  126,000   Cisco Systems, Inc.*                                           7,828
- --------------------------------------------------------------------------------
            Computer Software & Service (12.8%)
   88,000   America Online, Inc.*                                          8,371
  109,000   Microsoft Corp.*                                               9,354
  205,700   Oracle Corp.*                                                  7,829
  157,000   Rational Software Corp.*                                       5,240
   39,000   Synopsys, Inc.*                                                2,347
- --------------------------------------------------------------------------------
                                                                          33,141
- --------------------------------------------------------------------------------
            Distributions - Food/Health (0.3%)
   80,000   PSS World Med, Inc.*                                             825
- --------------------------------------------------------------------------------
            Diversified - Chemicals (1.6%)
  106,000   Monsanto Co.                                                   4,147
- --------------------------------------------------------------------------------
            Drugs (7.5%)
   36,000   Eli Lilly & Co.                                                2,362
  226,000   Pfizer, Inc.                                                   7,670
  137,000   Schering-Plough Corp.                                          6,713
   45,000   SmithKline Beecham plc ADR "A"                                 2,703
- --------------------------------------------------------------------------------
                                                                          19,448
- --------------------------------------------------------------------------------
            Electronics - Semiconductors (10.5%)
  166,000   Analog Devices, Inc.*                                          7,159
   93,000   Intel Corp.                                                    6,417
   86,000   Linear Technology Corp.                                        5,278
   58,000   Texas Instruments, Inc.                                        8,352
- --------------------------------------------------------------------------------
                                                                          27,206
- --------------------------------------------------------------------------------
            Equipment - Semiconductors (3.9%)
   89,000   Applied Materials, Inc.*                                       6,403
   50,000   Teradyne, Inc.*                                                3,728
- --------------------------------------------------------------------------------
                                                                          10,131
- --------------------------------------------------------------------------------
            Health Care - Diversified (9.3%)
   98,000   American Home Products Corp.                                   4,998
  106,000   Bristol-Myers Squibb Co.                                       7,049
   76,000   Johnson & Johnson, Inc.                                        7,001
   75,000   Warner-Lambert Co.                                             4,950
- --------------------------------------------------------------------------------
                                                                          23,998
- --------------------------------------------------------------------------------
            Hospitals (1.2%)
  125,000   Health Management Associates, Inc.*                            1,031
  201,000   LifePoint Hospitals, Inc.*                                     1,985
- --------------------------------------------------------------------------------
                                                                           3,016
- --------------------------------------------------------------------------------
            Insurance - Multi-Line Companies (2.6%)
   58,000   American International Group, Inc.                             6,735
- --------------------------------------------------------------------------------
            Internet Services (3.6%)
   12,000   Amazon.com, Inc.*                                              1,201
   18,000   Ask Jeeves, Inc.*                                                792
   84,000   drkoop.com, Inc.*                                              1,869
   38,000   eToys Inc.*                                                    1,518
   33,000   Marimba, Inc.*                                                   864
   10,000   Priceline.com, Inc.*                                             755
   17,000   Yahoo! Inc.*                                                   2,319
- --------------------------------------------------------------------------------
                                                                           9,318
- --------------------------------------------------------------------------------
            Major Regional - Banks (1.1%)
   86,000   Mellon Bank Corp.                                              2,903
- --------------------------------------------------------------------------------
            Medical Products & Supplies (4.5%)
   84,000   Guidant Corp.*                                                 4,919
   91,000   Medtronic, Inc.                                                6,558
- --------------------------------------------------------------------------------
                                                                          11,477
- --------------------------------------------------------------------------------
            Oil & Gas - Drilling/Equipment (2.0%)
   83,000   Schlumberger Ltd.                                              5,027
- --------------------------------------------------------------------------------
            Retail - Drugs (5.0%)
  147,000   CVS Corp.                                                      7,313
  175,700   Duane Reade, Inc.*                                             5,579
- --------------------------------------------------------------------------------
                                                                          12,892
- --------------------------------------------------------------------------------
            Services - Computer Systems (1.3%)
  114,000   SunGard Data Systems, Inc.*                                    3,263
- --------------------------------------------------------------------------------
            Services - Data Processing (2.9%)
  151,000   First Data Corp.                                               7,484
- --------------------------------------------------------------------------------
            Telecommunications - Long Distance (2.9%)
   92,000   MCI WorldCom, Inc.*                                            7,590
- --------------------------------------------------------------------------------
            Telephones (2.8%)
  124,000   SBC Communications Corp.                                       7,091
- --------------------------------------------------------------------------------
            Total common stocks (cost: $173,172)                         235,055
- --------------------------------------------------------------------------------

  Principal
   Amount
   (000)
- ------------

                                SHORT-TERM (9.6%)
            U.S. Government & Agency Issue
  $24,683   Federal Home Loan Mortgage Corp., 4.97%, 8/02/1999
              (cost: $24,676)                                             24,676
- --------------------------------------------------------------------------------
            Total investments (cost: $197,848)                          $259,731
================================================================================








USAA SCIENCE & TECHNOLOGY FUND
NOTES TO PORTFOLIO OF INVESTMENTS

July 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.
Investments in foreign securities were 6.0% of net assets at July 31, 1999.

ADR - American  Depositary Receipts are foreign shares held by a U.S. bank which
issues a receipt evidencing ownership. Dividends are paid in U.S. dollars.

SPECIFIC NOTES

* Non-income producing.


See accompanying notes to financial statements.










USAA SCIENCE & TECHNOLOGY FUND
STATEMENT OF ASSETS AND LIABILITIES
(IN THOUSANDS)

July 31, 1999

ASSETS
   Investments in securities, at market value
     (identified cost of $197,848)                                   $ 259,731
   Cash                                                                    358
   Receivables:
      Capital shares sold                                                  879
      Dividends                                                             97
      Securities sold                                                      718
                                                                     -----------
         Total assets                                                  261,783
                                                                     -----------

LIABILITIES
   Securities purchased                                                  3,390
   Capital shares redeemed                                                 137
   USAA Investment Management Company                                      159
   USAA Transfer Agency Company                                             32
   Accounts payable and accrued expenses                                    73
                                                                     -----------
         Total liabilities                                               3,791
                                                                     -----------
            Net assets applicable to capital shares outstanding      $ 257,992
                                                                     ===========

REPRESENTED BY:
   Paid-in capital                                                   $ 195,495
   Accumulated net realized gain on investments                            614
   Net unrealized appreciation of investments                           61,883
                                                                     -----------
            Net assets applicable to capital shares outstanding      $ 257,992
                                                                     ===========
   Capital shares outstanding                                           16,997
                                                                     ===========
   Authorized shares of $.01 par value                                 105,000
                                                                     ===========
   Net asset value, redemption price, and offering price per share   $   15.18
                                                                     ===========


See accompanying notes to financial statements.









USAA SCIENCE & TECHNOLOGY FUND
STATEMENT OF OPERATIONS
(IN THOUSANDS)

Year ended July 31, 1999

Net investment loss:
   Income:
      Dividends (net of foreign taxes withheld of $15)                 $    791
      Interest                                                              678
                                                                       ---------
         Total income                                                     1,469
                                                                       ---------
   Expenses:
      Management fees                                                     1,287
      Transfer agent's fees                                                 692
      Custodian's fees                                                       72
      Postage                                                                84
      Shareholder reporting fees                                             25
      Directors' fees                                                         3
      Registration fees                                                      80
      Professional fees                                                      34
      Other                                                                   3
                                                                       ---------
         Total expenses                                                   2,280
                                                                       ---------
            Net investment loss                                            (811)
                                                                       ---------
Net realized and unrealized gain on investments:
   Net realized gain                                                      1,987
   Change in net unrealized appreciation/depreciation                    49,484
                                                                       ---------
            Net realized and unrealized gain                             51,471
                                                                       ---------
Increase in net assets resulting from operations                       $ 50,660
                                                                       =========


See accompanying notes to financial statements.







USAA SCIENCE & TECHNOLOGY FUND
STATEMENTS OF CHANGES IN NET ASSETS
(IN THOUSANDS)

Years ended July 31,

                                                                1999      1998
                                                             -------------------
From operations:
   Net investment loss                                       $   (811) $   (478)
   Net realized gain (loss) on investments                      1,987      (562)
   Change in net unrealized appreciation/depreciation of
      investments                                              49,484    12,399
                                                             -------------------
      Increase in net assets resulting from operations         50,660    11,359
                                                             -------------------
From capital share transactions:
   Proceeds from shares sold                                  185,201   120,796
   Cost of shares redeemed                                    (89,187)  (20,837)
                                                             -------------------
      Increase in net assets from capital share transactions   96,014    99,959
                                                             -------------------
Net increase in net assets                                    146,674   111,318
Net assets:
   Beginning of period                                        111,318       -
                                                             -------------------
   End of period                                             $257,992  $111,318
                                                             ===================
Change in shares outstanding:
   Shares sold                                                 13,761    11,974
   Shares redeemed                                             (6,725)   (2,013)
                                                             -------------------
      Increase in shares outstanding                            7,036     9,961
                                                             ===================


See accompanying notes to financial statements.








USAA SCIENCE & TECHNOLOGY FUND
NOTES TO FINANCIAL STATEMENTS

July 31, 1999

(1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

USAA MUTUAL FUND, INC. (the Company),  registered  under the Investment  Company
Act of 1940,  as  amended,  is a  diversified,  open-end  management  investment
company  incorporated under the laws of Maryland consisting of thirteen separate
funds. The information presented in this annual report pertains only to the USAA
Science & Technology Fund (the Fund). The Fund's primary investment objective is
long-term capital appreciation. USAA Investment Management Company (the Manager)
seeks to achieve this  objective by investing at least 80% of the Fund's  assets
in equity  securities  that are expected to benefit from the development and use
of scientific and technological advances and improvements.

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.  Portfolio  securities,  except as  otherwise  noted,  traded  primarily on a
domestic  securities  exchange  are  valued  at the  last  sales  price  on that
exchange.

2.  Over-the-counter  securities  are priced at the last sales  price or, if not
available, at the average of the bid and asked prices.

3.  Securities  purchased  with  maturities  of 60 days or less  are  stated  at
amortized cost which approximates market value.

4.  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 Directors.

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.  As a result of certain
permanent  differences between book and tax basis accounting,  reclassifications
have  been  made  on  the  statement  of  assets  and  liabilities  to  decrease
accumulated   undistributed   net  investment  loss  by  $811,000  and  decrease
accumulated net realized gain on investments by $811,000.

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.  Dividend
income,  less foreign taxes, if any, is recorded on the ex-dividend date. If the
ex-dividend  date has passed,  certain  dividends  from foreign  securities  are
recorded upon  notification.  Interest  income is recorded on the accrual basis.
Discounts and premiums on short-term  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 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 any of these agreements during the year ended July 31, 1999.

(3) DISTRIBUTIONS

Distributions  of  net  investment  income  and  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.

(4) INVESTMENT TRANSACTIONS

Cost of purchases and proceeds from sales of  securities,  excluding  short-term
securities,  for the year ended July 31,  1999,  were  $145.2  million and $70.3
million, respectively.

Gross unrealized  appreciation  and depreciation of investments,  as of July 31,
1999, was $65.8 million and $3.9 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 .75% 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.

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.

D.  Brokerage services - USAA  Brokerage  Services, a discount brokerage service
of the Manager, may execute portfolio transactions  for the Fund.  The amount of
brokerage  commissions  paid to USAA Brokerage  Services,  during the year ended
July 31, 1999, was $30,000.

(6) TRANSACTIONS WITH AFFILIATES

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

(7) YEAR 2000 (Unaudited)

Like other mutual  funds,  the Fund could be adversely  affected if the computer
systems used by the Manager and the Fund's other service  providers are not able
to perform  their  intended  functions  effectively  after  1999  because of the
inability of computer  software to distinguish the year 2000 from the year 1900.
The Manager has taken steps to address  this  potential  year 2000  problem with
respect  to the  computer  systems  that  it  uses  and to  obtain  satisfactory
assurances  that  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.

(8) FINANCIAL HIGHLIGHTS

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

                                                     Year Ended July 31,
                                               --------------------------------
                                                     1999            1998*
                                               --------------------------------
Net asset value at beginning of period           $    11.17      $    10.00
Net investment loss                                    (.06)(a)        (.07)(a)
Net realized and unrealized gain                       4.07            1.24
                                               --------------------------------
Net asset value at end of period                 $    15.18      $    11.17
                                               ================================
Total return (%)                                      35.90           11.70
Net assets at end of period (000)                $  257,992      $  111,318
Ratio of expenses to average net assets (%)            1.33            1.42
Ratio of net investment loss to average
   net assets (%)                                      (.47)           (.69)
Portfolio turnover (%)                                44.39           76.31


 *  Fund commenced operations August 1, 1997.
(a) Calculated using weighted average shares.















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

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

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

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

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

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

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

Internet Access
www.usaa.com

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 ToughLine(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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