USAA MUTUAL FUND INC
N-30D, 1999-03-25
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Table of Contents

      USAA Family of Funds                            1
      Message from the President                      2
      Investment Review                               4
      Message from the Manager                        5
      Financial Information:
         Portfolio of Investments                     8
         Notes to Portfolio of Investments           11
         Statement of Assets and Liabilities         12
         Statement of Operations                     13
         Statements of Changes in Net Assets         14
         Notes to Financial Statements               15




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(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 Investment  Management  Company,  including charges and operating expenses,
please  call  1-800-531-8181  for a  prospectus.  Read it  carefully  before you
invest.













Message from the President

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

Over the past four years I have written many times of our  grandchildren.  As of
December  4, 1998,  we have  five.  Adam Roth  Bethel  was born to my  daughter,
Marnie, and her husband,  Jeff, in Austin,  Texas. The best news is that I think
he's  incredibly  handsome and Jeff's  mother thinks he looks like me. As do his
four cousins,  Adam has an InveStart  (Registered  Trademark)-type  account that
we've set up. His is in the USAA First Start  Growth  Fund.  Adam is, of course,
extremely  bright.  I am sure that in years to come he will enjoy learning about
investments through the USAA First Start Program.

Adam's  cousins'  accounts  with us are in four other USAA funds.  The oldest of
these  accounts is now over four years old and  belongs to Karl Joseph  Marbach.
When I last checked,  its balance was over $4,600.  The account is in the Income
Stock Fund and, thus, is subject to all the risks of stocks.  Indeed,  its value
dropped last August when the stock market declined sharply.  But it nevertheless
demonstrates the positive aspects of this kind of investment plan.

My wife and I decided to help with our grandchildren's  education.  Our  monthly
contributions  have been the main driver behind Karl's  account and those of his
cousins.  There will no doubt be future market declines, as there will be market
advances.  And Karl's parents no doubt add to this fund on occasion. But the key
thing is that we are  providing a systematic  plan of adding to this  investment
for Karl's higher education. I'll bet such a plan will work for Adam as well.

Sincerely,

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


Systematic  investment  plans do not assure a profit or protect  against loss in
declining markets.

The USAA Income Stock Fund's  average  annual total  returns for the 1-, 5-, and
10-year  periods  ending  January 31,  1999,  were 10.68%,  15.31%,  and 14.44%,
respectively.

Past  performance is no guarantee of future results;  the investment  return and
principal  value of an investment  will fluctuate so that an investor's  shares,
when redeemed, may be worth more or less than their original cost.

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:  Primarily  equity  securities  of companies  expected to
benefit from the  development and use of scientific and  technological  advances
and improvements.


- --------------------------------------------------------------------------------
                                           7/31/98              1/31/99
- --------------------------------------------------------------------------------
  Net Assets                            $111.3 Million       $183.9 Million
  Net Asset Value Per Share                 $11.17               $14.36
- --------------------------------------------------------------------------------



- --------------------------------------------------------------------------------
AVERAGE ANNUAL TOTAL RETURNS AS OF 1/31/99
- --------------------------------------------------------------------------------
  7/31/98 to 1/31/99             1 Year             Since Inception on 8/1/97
      28.56%(+)                  51.96%                      27.28%
- --------------------------------------------------------------------------------

(+) 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 Science & Technology Fund, the S&P
500 Index,  and the Lipper Science & Technology  Funds Average for the period of
08/01/97 through 01/31/99. 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
08/31/97           9,380                   9,440              10,042
09/30/97           9,800                   9,957              10,571
10/31/97           9,200                   9,625               9,575
11/30/97           9,240                  10,070               9,470
12/31/97           9,070                  10,243               9,178
01/31/98           9,450                  10,356               9,404
02/28/98          10,540                  11,102              10,482
03/31/98          10,660                  11,670              10,714
04/30/98          11,020                  11,790              11,162
05/31/98          10,390                  11,588              10,339
06/30/98          11,170                  12,058              11,159
07/31/98          11,170                  11,931              10,962
08/31/98           9,240                  10,207               8,739
09/30/98          10,100                  10,861               9,933
10/31/98          10,870                  11,743              10,582
11/30/98          11,660                  12,455              12,029
12/31/98          13,300                  13,172              14,059
01/31/99          14,360                  13,723              16,308

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


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  &
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 PORTFOLIO MANAGER, CURT ROHRMAN, CFA, APPEARS HERE]

STRATEGY
Your USAA  Science & Technology  Fund  invests in a broad  spectrum of companies
benefiting  from  the  development  and  use  of  scientific  and  technological
advances.  This extends our  strategy  beyond the  investment  objective of most
technology  funds that focus on  traditional  computer  technology.  It includes
areas   such   as   telecom   services,   pharmaceuticals,    medical   devices,
aerospace/defense,  and oilfield service.  We believe a broad-based  approach to
technology  has  the  ability  to  provide  performance  returns  comparable  to
traditional technology funds over time, but with lower volatility due to greater
diversification.

FUND PERFORMANCE
From July 31, 1998 to January 31, 1999,  the USAA  Science &  Technology  Fund's
cumulative total return was 28.56%, remarkable yet short of the Lipper Science &
Technology   Funds  Average  return  of  48.04%.(1)  Our  heavy   weightings  in
semiconductors and semiconductor capital equipment companies,  such as Teradyne,
Applied  Materials,  Texas  Instruments,  and Intel  helped  performance.  Other
positions posting strong gains included America Online,  Seagate, Cisco Systems,
and  Microsoft.   However,   our  exposure  to  healthcare   clearly  held  back
performance. During the period, technology stocks outperformed healthcare stocks
by a difference of 34.3 percentage  points.  Such a disparity should not persist
and, for reasons highlighted below, may reverse.

OUTLOOK
Our short-term and long-term outlook for the overall stock market is bullish.  A
combination  of  factors  -  healthy  domestic  demand,  low  inflation,  strong
productivity  gains,  and the shift to budget  surpluses from budget  deficits -
bode  well  for  domestic   earnings  growth  and  stable  (or  even  expanding)
price/earnings  ratios  (P/Es).  The  international  outlook is better as well -
troubled  economies in the Far East and Asia have probably  reached their lowest
point,  problems in Latin American  economies are being addressed,  and a weaker
dollar has been beneficial to domestic  corporations.  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 healthcare industries is as
bullish as ever. We see no credible threat on the horizon to corporate America's
dominance in innovation and knowledge capital. As we stressed six months ago, it
is "different this time." Advances in software, networking, semiconductors, and,
most  recently,  the Internet have been critical to the  sustainability  of this
economic   expansion   and   persistent   improvements   in   productivity   and
profitability.   Demographics,   research   efficiencies,   expedited   approval
processes,  and even global  harmonization of approvals,  provide an outstanding
environment for pharmaceuticals and medical devices.

Our  short-term  outlook  for  the  technology  and  healthcare   industries  is
relatively  cautious  for  several  reasons.  Although  past  performance  is no
guarantee of future results,  technology  stocks have moved upward in a straight
line since the market's  bottom,  with the S&P  Technology  sector soaring 81.6%
since October 8, 1998. Signs have indeed emerged of accelerating order patterns,
improved  supply/demand  balances,  and expanded  profitability in most areas of
technology.  But  if  we  are  correct  to  assume  stock  prices  and  investor
expectations  move  in  the  same  direction,   the  operating  environment  for
technology companies had better be significantly and substantially better.

Also, Y2K will undoubtedly  prove to be the most difficult factor to assess over
the next 18 months.  No, we don't believe  airplanes will fall from the sky. But
we do believe  corporations  understand the liability  exposure of a Y2K related
accident or shutdown.  Regardless of the preparation  taken, no one will know if
they are Y2K ready until the calendar turns. As a result,  corporations will err
on the side of conservatism - testing code until December 31st and installing no
new applications later this year - even to systems deemed Y2K compliant.

Putting these two concerns together, we believe some of the improved environment
since October 1998 relates to corporate  spending in  anticipation of "battening
down the Y2K  hatches." If our  assessment is accurate,  the recent  recovery in
technology  stocks may mirror a mid-1995  surge in technology  stock prices.  In
mid-1995, a burst of demand for semiconductors and computers proved to be merely
inventory building, and technology stocks fell as rapidly as they had risen once
the underlying weak demand trends became apparent.

Lastly,  concerns about  pharmaceutical  pricing pressure have resurfaced as the
federal government begins exploring options to provide  pharmaceutical  coverage
for the elderly. Washington's focus on the impeachment trial and Social Security
reduces the  probability of any  pharmaceutical  legislation  being enacted this
year. However, discussions may still impact stock prices.


(1)  Past  performance  is no  guarantee  of  future  results.






- ---------------------------------       ----------------------------------------
      TOP 10 EQUITY HOLDINGS                       TOP 10 INDUSTRIES
        (% OF NET ASSETS)                          (% OF NET ASSETS)
- ---------------------------------       ----------------------------------------
America Online               4.2         Electronics-Semiconductors        12.2
Cisco Systems                3.8         Drugs                             10.1
Microsoft                    3.6         Computer Software & Service        9.2
Applied Materials            3.5         Communication Equipment            7.6
Hewlett-Packard              3.2         Healthcare-Diversified             6.7
Medtronic                    3.2         Equipment-Semiconductors           6.6
Pfizer                       3.1         Medical Products & Supplies        4.6
Teradyne                     3.0         Retail-Drugs                       4.4
MCI Worldcom                 3.0         Internet Services                  4.3
Intel                        3.0         Services-Data Processing           4.2
- ---------------------------------       ----------------------------------------


See page 8 for a complete listing of the Portfolio of Investments.











USAA SCIENCE & TECHNOLOGY FUND
PORTFOLIO OF INVESTMENTS

January 31, 1999
(Unaudited)

                                                                       Market
  Number                                                               Value
of Shares                Security                                      (000)
- --------------------------------------------------------------------------------
                     COMMON STOCKS (96.7%)
               Chemicals (2.7%)
     106,000   Monsanto Co.                                             $ 5,042
- --------------------------------------------------------------------------------
               Communication Equipment (7.6%)
     170,000   LM Ericsson Telephone Co. ADR                              4,739
      40,000   Lucent Technologies, Inc.                                  4,503
      54,000   Tellabs, Inc.*                                             4,630
- --------------------------------------------------------------------------------
                                                                         13,872
- --------------------------------------------------------------------------------
               Computer - Hardware (3.2%)
      76,000   Hewlett-Packard Co.                                        5,956
- --------------------------------------------------------------------------------
               Computer - Networking (3.8%)
      63,000   Cisco Systems, Inc.*                                       7,028
- --------------------------------------------------------------------------------
               Computer - Peripherals (0.9%)
      41,000   Seagate Technology, Inc.*                                  1,668
- --------------------------------------------------------------------------------
               Computer Software & Service (9.2%)
      38,000   Microsoft Corp.*                                           6,650
      86,000   Network Associates, Inc.*                                  4,504
     107,000   Rational Software Corp.*                                   3,538
      37,000   Synopsys, Inc.*                                            2,148
- --------------------------------------------------------------------------------
                                                                         16,840
- --------------------------------------------------------------------------------
               Drugs (10.1%)
      27,000   Eli Lilly & Co.                                            2,530
      44,000   Pfizer, Inc.                                               5,659
      94,000   Schering-Plough Corp.                                      5,123
      45,000   SmithKline Beecham plc ADR "A"                             3,052
      47,000   Zeneca Group plc ADR                                       2,209
- --------------------------------------------------------------------------------
                                                                         18,573
- --------------------------------------------------------------------------------
               Electronics - Semiconductors (12.2%)
     176,000   Analog Devices, Inc.*                                      5,236
      39,000   Intel Corp.                                                5,497
      34,000   KLA-Tencor Corp.*                                          1,963
      43,000   Linear Technology Corp.                                    4,375
      54,000   Texas Instruments, Inc.                                    5,339
- --------------------------------------------------------------------------------
                                                                         22,410
- --------------------------------------------------------------------------------
               Equipment - Semiconductors (6.6%)
     102,000   Applied Materials, Inc.*                                   6,445
      85,000   Teradyne, Inc.*                                            5,599
- --------------------------------------------------------------------------------
                                                                         12,044
- --------------------------------------------------------------------------------
               Finance - Diversified (2.3%)
      25,000   Federal Home Loan Mortgage Corp.                           1,550
      31,000   Morgan Stanley, Dean Witter, Discover & Co.                2,691
- --------------------------------------------------------------------------------
                                                                          4,241
- --------------------------------------------------------------------------------
               Healthcare - Diversified (6.7%)
      16,000   Abbott Laboratories                                          743
      35,000   Bristol-Myers Squibb Co.                                   4,487
      60,000   Johnson & Johnson, Inc.                                    5,100
      28,000   Warner-Lambert Co.                                         2,021
- --------------------------------------------------------------------------------
                                                                         12,351
- --------------------------------------------------------------------------------
               Insurance - Multi-Line Companies (2.8%)
      49,000   American International Group, Inc.                         5,044
- --------------------------------------------------------------------------------
               Internet Services (4.3%)
      44,000   America Online, Inc.*                                      7,730
       3,700   Ticketmaster Online-CitySearch, Inc. "B"*                    232
- --------------------------------------------------------------------------------
                                                                          7,962
- --------------------------------------------------------------------------------
               Major Regional Banks (3.0%)
      60,000   Fleet Financial Group, Inc.                                2,659
      43,000   Mellon Bank Corp.                                          2,881
- --------------------------------------------------------------------------------
                                                                          5,540
- --------------------------------------------------------------------------------
               Marketing/Advertising (1.6%)
      72,700   Snyder Communications, Inc.*                               2,908
- --------------------------------------------------------------------------------
               Medical Products & Supplies (4.6%)
      21,000   Becton, Dickinson & Co.                                      751
      32,000   Guidant Corp.                                              1,886
      73,000   Medtronic, Inc.                                            5,817
- --------------------------------------------------------------------------------
                                                                          8,454
- --------------------------------------------------------------------------------
               Oil & Gas - Drilling/Equipment (1.0%)
      38,000   Schlumberger Ltd.                                          1,810
- --------------------------------------------------------------------------------
               Paper & Forest Products (0.6%)
      17,500   Georgia Pacific Corp.                                      1,129
- --------------------------------------------------------------------------------
               Retail - Drugs (4.4%)
      85,000   CVS Corp.                                                  4,654
     124,000   Duane Reade, Inc.*                                         3,456
- --------------------------------------------------------------------------------
                                                                          8,110
- --------------------------------------------------------------------------------
               Services - Commercial & Consumer (0.5%)
      69,000   Applied Graphics Technologies, Inc.*                         992
- --------------------------------------------------------------------------------
               Services - Data Processing (4.2%)
     124,900   First Data Corp.                                           4,785
      84,000   SunGard Data Systems, Inc.*                                3,014
- --------------------------------------------------------------------------------
                                                                          7,799
- --------------------------------------------------------------------------------
               Telecommunications - Long Distance (3.0%)
      69,000   MCI WorldCom, Inc.*                                        5,503
- --------------------------------------------------------------------------------
               Telephones (1.4%)
      48,000   SBC Communications Corp.                                   2,592
- --------------------------------------------------------------------------------
               Total common stocks (cost: $126,077)                     177,868
- --------------------------------------------------------------------------------

   Principal
    Amount
     (000)
- --------------
                     SHORT-TERM (2.4%)
               U.S. Government & Agency Issue
     $ 4,353   Federal Home Loan Mortgage Corp., 4.62%,
                2/01/1999 (cost: $4,352)                                  4,352
- --------------------------------------------------------------------------------
               Total investments (cost: $130,429)                      $182,220
================================================================================









USAA SCIENCE & TECHNOLOGY FUND
NOTES TO PORTFOLIO OF INVESTMENTS

January 31, 1999
(Unaudited)


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

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

The percentages shown represent the percentage of the investments to net assets.
Investments in foreign securities were 6.4% of net assets at January 31, 1999.

ADR - American Depositary Receipts are receipts issued by a U.S. bank evidencing
ownership of foreign shares. 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)

January 31, 1999
(Unaudited)


ASSETS
   Investments in securities, at market value
    (identified cost of $130,429)                                     $ 182,220
   Cash                                                                     190
   Receivables:
      Capital shares sold                                                   928
      Dividends                                                              54
      Securities sold                                                     2,192
                                                                      ----------
         Total assets                                                   185,584
                                                                      ----------
LIABILITIES
   Securities purchased                                                   1,187
   Capital shares redeemed                                                  252
   USAA Investment Management Company                                       108
   USAA Transfer Agency Company                                              57
   Accounts payable and accrued expenses                                     39
                                                                      ----------
         Total liabilities                                                1,643
                                                                      ----------
            Net assets applicable to capital shares outstanding       $ 183,941
                                                                      ==========
REPRESENTED BY:
   Paid-in capital                                                    $ 133,048
   Accumulated net investment loss                                         (360)
   Accumulated net realized loss on investments                            (538)
   Net unrealized appreciation of investments                            51,791
                                                                      ----------
            Net assets applicable to capital shares outstanding       $ 183,941
                                                                      ==========
   Capital shares outstanding                                            12,805
                                                                      ==========
   Authorized shares of $.01 par value                                  105,000
                                                                      ==========
   Net asset value, redemption price, and offering price per share    $   14.36
                                                                      ==========


See accompanying notes to financial statements.











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

Six-month period ended January 31, 1999
(Unaudited)


Net investment loss:
   Income:
      Dividends (net of foreign taxes withheld of $2)                 $     312
      Interest                                                              179
                                                                      ----------
         Total income                                                       491
                                                                      ----------
   Expenses:
      Management fees                                                       484
      Transfer agent's fees                                                 257
      Custodian's fees                                                       31
      Postage                                                                29
      Shareholder reporting fees                                              8
      Directors' fees                                                         2
      Registration fees                                                      21
      Professional fees                                                      17
      Other                                                                   2
                                                                      ----------
         Total expenses                                                     851
                                                                      ----------
            Net investment loss                                            (360)
                                                                      ----------
Net realized and unrealized gain on investments:
   Net realized gain                                                         24
   Change in net unrealized appreciation/depreciation                    39,392
                                                                      ----------
            Net realized and unrealized gain                             39,416
                                                                      ----------
Increase in net assets resulting from operations                      $  39,056
                                                                      ==========

See accompanying notes to financial statements










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

Six-month period ended January 31, 1999
and Year ended July 31, 1998
(Unaudited)


                                                           1/31/99      7/31/98
                                                        ------------------------
From operations:
   Net investment loss                                    $   (360)    $   (478)
   Net realized gain (loss) on investments                      24         (562)
   Change in net unrealized appreciation/
     depreciation of investments                            39,392       12,399
                                                        ------------------------
     Increase in net assets resulting from operations       39,056       11,359
                                                        ------------------------
From capital share transactions:
   Proceeds from shares sold                                73,725      120,796
   Cost of shares redeemed                                 (40,158)     (20,837)
                                                        ------------------------
     Increase in net assets from capital share
       transactions                                         33,567       99,959
                                                        ------------------------
Net increase in net assets                                  72,623      111,318
Net assets:
   Beginning of period                                     111,318           -
                                                        ------------------------
   End of period                                          $183,941     $111,318
                                                        ========================
Undistributed net investment loss included in
  net assets:
   End of period                                          $   (360)    $     -
                                                        ========================
Change in shares outstanding:
   Shares sold                                               6,148       11,974
   Shares redeemed                                          (3,304)      (2,013)
                                                        ------------------------
     Increase in shares outstanding                          2,844        9,961
                                                        ========================

See accompanying notes to financial statements.










USAA SCIENCE & TECHNOLOGY FUND
NOTES TO FINANCIAL STATEMENTS

January 31, 1999
(Unaudited)


(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 ten  separate
funds. The information  presented in this semiannual 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.

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 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 both agreements with
CAPCO,  the Fund may borrow  from  CAPCO an amount up to 5% of the Fund's  total
assets at CAPCO's borrowing rate with no markup.  Subject to availability  under
its agreement with  NationsBank,  the Fund may borrow from NationsBank an amount
which, when added to outstanding borrowings under the CAPCO agreements, does not
exceed 25% of the Fund's total  assets at  NationsBank's  borrowing  rate plus a
markup.  The Fund had no  borrowings  under any of these  agreements  during the
six-month period ended January 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.  At July 31,
1998,  the Fund had capital loss  carryovers  for federal income tax purposes of
approximately  $470,000 which, if not offset by subsequent  capital gains,  will
expire in 2006.  It is  unlikely  that the  Company's  Board of  Directors  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 of  securities,  excluding  short-term
securities,  for the six-month  period ended January 31, 1999 were $64.8 million
and $35.1 million, respectively.

Gross unrealized  appreciation and depreciation of investments as of January 31,
1999 was $54.9 million and $3.1 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 six-month
period ended January 31, 1999 was $15,000.


(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 January 31, 1999, the  Association and its affiliates
owned 1.3 million shares (10.0%) of the Fund.

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

                                             Six-month
                                           Period Ended              Year Ended
                                            January 31,               July 31,
                                               1999                    1998*
                                        ----------------------------------------
Net asset value at 
   beginning of period                     $  11.17                 $  10.00
Net investment loss                            (.03)(a)                 (.07)(a)
Net realized and unrealized gain               3.22                     1.24
                                        ----------------------------------------
Net asset value at end of period           $  14.36                 $  11.17
                                        ========================================
Total return (%)                              28.56                    11.70
Net assets at end of period (000)          $183,941                 $111,318
Ratio of expenses to
   average net assets (%)                      1.31(b)                  1.42
Ratio of net investment
   loss to average net assets (%)              (.55)(b)                 (.69)
Portfolio turnover (%)                        28.32                    76.31


 * Fund commenced operations August 1, 1997.
(a)Calculated using weighted average shares.
(b)Annualized.  The  ratio  is  not  necessarily  indicative  of  12  months  of
   operations.









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 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 USAA TouchLine(Service Mark)
(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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