VANGUARD ADMIRAL FUNDS INC
N-30D, 1996-09-20
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<PAGE>   1
                           A MESSAGE TO SHAREHOLDERS

FELLOW SHAREHOLDER:

After a remarkably robust rise in 1995, the bond market suffered a sharp
setback during the six months ended July 31, 1996, the first half of the fiscal
year for Vanguard Admiral Funds. Interest rates rose substantially for all but
the very shortest maturities, and fixed-income securities gave back some of the
price gains they enjoyed over the previous 13 months or so.

         Not surprisingly, our tightly constructed Portfolios achieved total
returns (capital change plus reinvested dividends) very much in line with the
sectors of the bond market that they represent. Our Short-Term Portfolio eked
out a small positive return during the six months, while our Intermediate-Term
and Long-Term Portfolios were off -3.3% and -6.9%, respectively. True to form,
our Money Market Portfolio provided a solid half-year return of +2.6%. This
table presents the return of each Portfolio for the half year, as well as its
current yield:

<TABLE>
<CAPTION>
- -----------------------------------------------------
                                  SIX MONTHS ENDED
                                  JULY 31, 1996
                             ------------------------
U.S. TREASURY                 TOTAL        CURRENT
PORTFOLIO                     RETURN       YIELD*
- -----------------------------------------------------
<S>                           <C>                <C>
LONG-TERM                     -6.9%              7.1%
INTERMEDIATE-TERM             -3.3               6.8
SHORT-TERM                    +0.2               6.3
MONEY MARKET                  +2.6               5.1
- -----------------------------------------------------
</TABLE>
*Yield for the Money Market Portfolio is a 7-day yield. All others are
 30-day yields.

The detailed per share figures for each Portfolio, including net asset values,
income dividends, and any distributions from net realized capital gains, are
shown in the table on page 3 of this Report.

         As we noted a year ago, in a very different environment for the bond
market, we believe that a presentation of semi-annual returns for bond mutual
funds, while necessary in a report of this nature, is incomplete, to say the
least. Only half of the year's interest income is accounted for in these
returns, while the capital change in a bond fund--up or down--occurs
immediately in response to changes in market interest rates. Yet over the long
run, interest income has accounted for virtually 100% of the total return on
bond funds. The following table presents the return of each Portfolio for the
past twelve months, divided into its income and capital components:

<TABLE>
<CAPTION>
- ------------------------------------------------------- 
                           COMPONENTS OF TOTAL RETURN   
                        ------------------------------- 
                              TWELVE MONTHS ENDED       
                                 JULY 31, 1996          
                        ------------------------------- 
U.S. TREASURY            INCOME     CAPITAL      TOTAL  
PORTFOLIO                RETURN      RETURN      RETURN 
- ------------------------------------------------------- 
<S>                      <C>         <C>         <C>    
LONG-TERM                +6.7%       -2.0%       +4.7%  
INTERMEDIATE-TERM        +6.4        -1.8        +4.6   
SHORT-TERM               +6.1        -1.0        +5.1   
MONEY MARKET             +5.4         0.0        +5.4   
- ------------------------------------------------------- 
</TABLE>                                               

This table provides a sense of the relative price volatility of each Portfolio.
However, the table does not present a full picture of price volatility, since
the rise in interest rates over the twelve months ended July 31, 1996, was not
uniform across all maturity levels. The yield on three-year and ten-year U.S.
Treasury securities, for example, rose by about 40 basis points (0.4 percentage
points), while the yield on the benchmark 30-year Treasury bond rose by less
than 20 basis points. We remind you that an equal change--up or down--in
interest rates has a much greater impact on the capital returns of bonds with
long maturities than on the capital returns of bonds with short maturities.

THE PERIOD IN REVIEW

After a stupendous showing by the bond market in the fiscal year ended January
31, 1996, with double-digit returns across the maturity spectrum, perhaps it
was only natural for the bond market to retrace some of its gains in the first
half of this fiscal year.

         While the rate on 90-day Treasury bills rose by about one-quarter of a
percentage point (from 5.0% to 5.3%), the increase in interest rates was much
sharper for bonds during the past six months. The biggest change, curiously,
was in short-term Treasury bonds (three-year maturities), whose average yield
rose from 5.0% to 6.3%. Yields on intermediate-term





                                       1
<PAGE>   2
Treasury bonds rose from 5.6% to 6.8%, while the yield on the benchmark
long-term Treasury bond rose from 6.0% to 7.0%.

         While the yield increases in the three maturity ranges were similar
(+1.3% to +1.0%) over the past six months, the price changes were not. As we
have emphasized in past reports, the impact of changing yields on bond prices
is magnified as a bond's maturity lengthens. For example, in the face of a 1%
increase (or decrease) in yield, the price of a long (30-year) bond will move
down (or up) by about 10%, while the price of a short-term bond will move down
(or up) by roughly 2%. This relationship reflects the immutable mathematics of
the bond market. As unsettling as the -12% price decline in long-term bonds was
during the six months ended July 31, we would note that it was roughly half the
price increase that holders of 30-year Treasury bonds enjoyed in the previous
year.

         Interest-rate changes are easier to quantify than to explain, of
course. Most analysts, however, have attributed the recent increase to
surprisingly strong growth in the U.S. economy, which raised anxiety among bond
investors that inflation would rise from the fairly benign  levels of recent
years. Bond investors are hypersensitive to the possibility of higher
inflation, which could threaten the purchasing power of a bond's future
fixed-rate payments. Should inflation rise from today's level, it is
possible--even probable--that the Federal Reserve Board would act to raise
short-term interest rates. It remains to be seen what the Fed--or the
economy--will do. However, the current structure and level of interest rates
seem to anticipate some reasonable pickup in inflation, and bond investors may
well have already adjusted to such a scenario.

         We would note that the prevailing consensus of the bond market--as
with any financial market--is subject to rapid and unpredictable changes in
direction. Only six months ago, the "experts" were  in general agreement that
economic growth was proceeding at a deliberate and safe pace so that inflation
would remain subdued, and that interest rates should remain steady. However,
the consensus--so often wrong--proved wrong again as rates moved higher.

IN SUMMARY

Six months ago in Vanguard Admiral Funds' Annual Report, we noted that the
unusually high total returns on bonds last year--and, indeed, over the previous
decade--were by themselves a sufficient reason to be cautious about the outlook
for future returns. Yet we expressed confidence that investors who use our
Portfolios as part of a balanced asset allocation strategy would earn long-term
returns in keeping with the bond market segments on which the Portfolios focus,
and that exceed the averages for competitive funds.  We also believe that the
higher yields available today have increased the relative attractiveness of
bonds. We assure you that we will continue to professionally manage our
Portfolios under the carefully structured, high-quality, low-cost philosophy
for which Vanguard is known.

         We look forward to reporting to you on the Fund's full year results in
our Annual Report six months hence.

Sincerely,



/s/ JOHN C. BOGLE
John C. Bogle
Chairman of the Board




/s/ JOHN J. BRENNAN
John J. Brennan
President

August 9, 1996





                                       2
<PAGE>   3
                              PORTFOLIO STATISTICS



<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------------
                                                   NET ASSET VALUE
                                                      PER SHARE             TWELVE MONTHS             TOTAL RETURNS
                                                ---------------------  ------------------------    -------------------    SEC 30-DAY
U.S. TREASURY           AVERAGE       AVERAGE   JANUARY 31,  JULY 31,   INCOME    CAPITAL GAINS      SIX       TWELVE     ANNUALIZED
PORTFOLIO               MATURITY      QUALITY*     1996        1996    DIVIDENDS  DISTRIBUTIONS     MONTHS     MONTHS       YIELD
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                   <C>               <C>       <C>        <C>         <C>           <C>          <C>         <C>           <C>
LONG-TERM             21.8 YEARS        Aaa       $11.06     $ 9.93      $.684         $.119        -6.9%       +4.7%         7.11%
INTERMEDIATE-TERM      7.5 YEARS        Aaa        10.70      10.02       .653            --        -3.3        +4.6          6.81
SHORT-TERM             2.5 YEARS        Aaa        10.23       9.96       .604            --        +0.2        +5.1          6.34
MONEY MARKET            48 DAYS         Aaa         1.00       1.00       .052            --        +2.6        +5.4          5.13**
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

 *Ratings provided by Moody's Investors Services.  Securities receiving a AAa
  rating are judged to be of the best quality, carrying the smallest degree of
  credit risk.  U.S. Government  and agency securities are considered to have
  Aaa ratings.
**7-day yield





                                       3
<PAGE>   4
                      REPORT FROM THE INVESTMENT ADVISER


During the first six months of the current fiscal year, bond markets were
unpleasantly reminiscent (though to a somewhat lesser degree) of 1994. Treasury
bond yields rose by between 1.0% and 1.3%, with securities maturing in two to
five years experiencing the greatest increases, while Treasury bill rates were
up 0.25% to 0.5%. Bond prices respond to changes in interest rates in direct
proportion to their maturity, and 30-year Treasury bonds fell approximately
- -13% in price over this period. Please refer to the Message To Shareholders for
a complete discussion of the returns of the various Portfolios of Vanguard
Admiral Funds.

         Most of the damage in this year's bond market sell-off was done in the
first three months of the fiscal year, as the market tumbled from a fairly
lofty perch. The temporary shutdowns of the Federal government, the January
blizzard in the eastern states, and continuing production slowdowns fostered a
progressively more downbeat interpretation of the economic indicators, despite
the fact that these one-time shocks would have little or no long-term impact on
the economy. Having received small monetary policy easings (fine tuning really)
from the Federal Reserve in December '95 and January '96, the market expected
more largesse from the Central Bank.

         Unfortunately, these expectations collided with a new
reality--reaccelerating economic growth. Within a month the rout began. A
stream of strong economic statistics ensued which caused the market to postpone
and eventually reverse expectations  of easier monetary policy. Labor market
indicators were especially prominent, with the unemployment rate falling to a
level that many economists feel is unsustainable without increased wage
inflation.

         Toward the close of the fiscal period, interest rates retraced some of
their rise, causing bonds to recoup a portion of their losses. Despite
predictions of rising inflation based on the rapid pace of economic growth and
job creation, the actual increase in the overall level of prices and wages has
held to the subdued trend of the past few years.  The rapid pace of
technological advancement in the workplace has caused some observers to assert
that the economy can grow substantially faster than the conventional "speed
limit" of 2.0% to 2.5% without endangering our low inflation rate. Because
major changes in inflation and productivity trends occur over long periods of
time, it is too soon to tell whether the confluence of high real growth and low
inflation witnessed this year is a temporary phenomenon due to the normal
interaction of economic cycles or a sign of fundamental, sustainable change in
the functioning of our economy.

         During the past two and one-half years, the bond market has given
investors a roller coaster ride; the grinding ascent of interest rates of
1994's bear market, followed by a breathtaking rally in 1995 and another jolt
back down in 1996. Such volatility is often times unpredictable. Our
philosophy, as in the past, is to be sure that each Portfolio of Vanguard
Admiral Funds produces returns that mirror those of its respective Treasury
market sectors. Our goal is to add value at the margin through moderate and
disciplined adjustments to market exposure based on our fundamental outlook. In
addition, we use quantitative research in an attempt to optimize the securities
selected and add incremental yield through investment in less well known
entities whose securities benefit from the full faith and credit guaranty of
the U.S. Treasury. (The Money Market Portfolio, however, invests only in U.S.
Treasury securities.)

         The Admiral Funds' emphasis on Treasury securities offers potential
state and local tax savings, and its extremely low expenses ensure that our
shareholders receive the lion's share of the market's return. We appreciate the
confidence you have placed in us by investing with  Vanguard and look forward
to reporting to you on the full fiscal year six months hence.

Respectfully,

Ian A. MacKinnon, Senior Vice President

Robert F. Auwaerter, Principal

John W. Hollyer, Principal

Vanguard Fixed Income Group       August 5, 1996





                                       4
<PAGE>   5
                            STATEMENT OF NET ASSETS

                                                FINANCIAL STATEMENTS (unaudited)
                                                                   July 31, 1996

<TABLE>
<CAPTION>
                                                                 Face                    Market
U.S. TREASURY                                                  Amount                     Value
MONEY MARKET PORTFOLIO                                          (000)                    (000)+
- -----------------------------------------------------------------------------------------------
<S>                                                       <C>                       <C>
U.S. GOVERNMENT OBLIGATIONS (98.9%)
- -----------------------------------------------------------------------------------------------
U.S. TREASURY BILLS
  4.835%, 9/16/96                                         $    19,210               $    19,076
  5.11%, 9/5/96                                               279,440                   278,058
  5.177%, 10/10/96                                              7,980                     7,901
  5.218%, 10/3/96                                             418,566                   414,822
  5.218%, 10/17/96                                             26,392                    26,101
  5.244%, 10/24/96                                            187,000                   184,740
  5.275%, 11/7/96                                               8,906                     8,780
  5.283%, 10/17/96                                            200,071                   197,852
U.S. TREASURY NOTES
  4.375%, 8/15/96                                             507,528                   507,351
  6.25%, 8/31/96                                              195,399                   195,506
  6.875%, 10/31/96                                            132,317                   132,758
  7.25%, 8/31/96                                               50,000                    50,069
  7.25%, 11/15/96                                             135,000                   135,636
  8.00%, 10/15/96                                             419,101                   421,272
- -----------------------------------------------------------------------------------------------
TOTAL U.S. GOVERNMENT OBLIGATIONS
  (Cost $2,579,922)                                                                   2,579,922
- -----------------------------------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (1.1%)
- -----------------------------------------------------------------------------------------------
  Other Assets--Note B                                                                   37,964
  Liabilities                                                                            (9,084)
                                                                                    -----------
                                                                                         28,880
- -----------------------------------------------------------------------------------------------
NET ASSETS (100%)
- -----------------------------------------------------------------------------------------------
  Applicable to 2,608,896,372 outstanding
    $.001 par value shares
    (authorized 20,000,000,000 shares)                                               $2,608,802
- -----------------------------------------------------------------------------------------------
NET ASSET VALUE PER SHARE                                                                 $1.00
===============================================================================================
</TABLE>
+See Note A to Financial Statements.


<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------
AT JULY 31, 1996, NET ASSETS CONSISTED OF:
- -----------------------------------------------------------------------------------------------
                                                               AMOUNT                       PER
                                                                (000)                     SHARE
                                                           ----------                   -------
<S>                                                        <C>                            <C>
PAID IN CAPITAL                                            $2,608,896                     $1.00
UNDISTRIBUTED NET
  INVESTMENT INCOME                                                --                        --
ACCUMULATED NET
  REALIZED LOSSES                                                 (94)                       --
UNREALIZED APPRECIATION
  OF INVESTMENTS                                                   --                        --
- -----------------------------------------------------------------------------------------------
NET ASSETS                                                 $2,608,802                     $1.00
- -----------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
                                                                 Face                    Market
SHORT-TERM                                                     Amount                     Value
U.S. TREASURY PORTFOLIO                                         (000)                    (000)+
- -----------------------------------------------------------------------------------------------
U.S. GOVERNMENT OBLIGATIONS (97.7%)
- -----------------------------------------------------------------------------------------------
<S>                                                          <C>                       <C>
U.S. TREASURY NOTES
  5.625%, 10/31/97                                           $110,000                  $109,450
  5.625%, 11/30/00                                              5,000                     4,830
  5.875%, 3/31/99                                               6,500                     6,426
  6.25%, 8/31/00                                                8,200                     8,121
  6.50%, 4/30/99                                                3,000                     3,011
  6.75%, 6/30/99                                               52,500                    52,984
  6.875%, 8/31/99                                              37,700                    38,154
  7.125%, 9/30/99                                              39,500                    40,265
  7.75%, 11/30/99                                              33,500                    34,777
  7.75%, 12/31/99                                              92,300                    95,905
  7.75%, 1/31/00                                               10,000                    10,389
  7.875%, 4/15/98                                              10,500                    10,787
BANCO NACIONAL DE
  COMERCIO EXTERIOR
  (U.S. Government Guaranteed)
  4.62%, 10/15/98*                                              4,054                     3,980
  4.91%, 10/15/98*                                              3,000                     2,946
  5.10%, 4/15/98*                                               2,400                     2,378
  5.48%, 10/15/97*                                                910                       907
  6.475%, 5/15/00*                                              4,711                     4,704
  8.038%, 1/15/00*                                              4,890                     5,026
BARIVEN, SA EXIMBANK GUARANTEED
  EXPORT FINANCING
  (U.S. Government Guaranteed)
  6.277%, 4/15/01*(1)                                           8,000                     7,932
GOVERNMENT EXPORT TRUST
  (U.S. Government Guaranteed)
  4.61%, 9/1/98*                                                  600                       590
  5.69%, 2/1/98*                                                  400                       398
  7.75%, 1/1/00*                                                4,200                     4,290
GUARANTEED EXPORT CERTIFICATES
  (U.S. Government Guaranteed)
  4.743%, 9/15/98*                                              4,500                     4,428
  6.61%, 9/15/99*                                               5,100                     5,114
GUARANTEED TRADE TRUST
  (U.S. Government Guaranteed)
  4.77%, 11/1/97*                                               2,790                     2,763
  4.86%, 4/1/98*                                                2,000                     1,979
- -----------------------------------------------------------------------------------------------
TOTAL U.S. GOVERNMENT OBLIGATIONS
  (Cost $465,189)                                                                       462,534
- -----------------------------------------------------------------------------------------------
</TABLE>





                                       5
<PAGE>   6
                      STATEMENT OF NET ASSETS (continued)

<TABLE>
<CAPTION>
                                                                 Face                    Market
                                                               Amount                     Value
                                                                (000)                    (000)+
- -----------------------------------------------------------------------------------------------
TEMPORARY CASH INVESTMENT (3.4%)
- -----------------------------------------------------------------------------------------------
<S>                                                           <C>                     <C>
REPURCHASE AGREEMENT
  Collateralized by U.S. Government
    Obligations in a Pooled Cash
    Account 5.62%, 8/1/96
    (Cost $16,225)                                            $16,225                  $ 16,225
- -----------------------------------------------------------------------------------------------
TOTAL INVESTMENTS (101.1%)
  (Cost $481,414)                                                                       478,759
- -----------------------------------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (-1.1%)
- -----------------------------------------------------------------------------------------------
  Other Assets--Note B                                                                    7,710
  Liabilities                                                                           (13,006)
                                                                                    ------------
                                                                                         (5,296)
- -----------------------------------------------------------------------------------------------
NET ASSETS (100%)
- -----------------------------------------------------------------------------------------------
  Applicable to 47,539,607 outstanding
    $.001 par value shares
   (authorized 500,000,000 shares)                                                     $473,463
- -----------------------------------------------------------------------------------------------
NET ASSET VALUE PER SHARE                                                                 $9.96
===============================================================================================
</TABLE>
+  See Note A to Financial Statements.  
*  The average maturity is shorter than the final maturity shown due to
   scheduled interim principal payments.
(1)Restricted security representing 1.7% of net assets at July 31, 1996.


<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------
AT JULY 31, 1996, NET ASSETS CONSISTED OF:                     
- ------------------------------------------------------------------------------------------------
                                                               AMOUNT                       PER
                                                                (000)                     SHARE
                                                             --------                   -------
<S>                                                          <C>                        <C>
  PAID IN CAPITAL                                            $479,178                    $10.08
  UNDISTRIBUTED NET
    INVESTMENT INCOME                                              --                        --
  ACCUMULATED NET
    REALIZED LOSSES                                            (3,060)                     (.06)
  UNREALIZED DEPRECIATION
    OF INVESTMENTS--NOTE D                                     (2,655)                     (.06)
- ------------------------------------------------------------------------------------------------
NET ASSETS                                                   $473,463                    $ 9.96
- ------------------------------------------------------------------------------------------------
</TABLE>



<TABLE>
<CAPTION>
                                                                 Face                    Market
INTERMEDIATE-TERM                                              Amount                     Value
U.S. TREASURY PORTFOLIO                                         (000)                    (000)+
- -----------------------------------------------------------------------------------------------
<S>                                                          <C>                       <C>
U.S. GOVERNMENT OBLIGATIONS (95.3%)
- -----------------------------------------------------------------------------------------------
U.S. TREASURY BONDS
  10.375%, 11/15/12                                          $112,450                  $141,915
  10.75%, 2/15/03                                               5,000                     6,066
  10.75%, 5/15/03                                              13,900                    16,941
  11.125%, 8/15/03                                              6,500                     8,088
  11.625%, 11/15/02                                            27,200                    34,072
  11.625%, 11/15/04                                            12,600                    16,433
  11.875%, 11/15/03                                             5,000                     6,463
U.S. TREASURY NOTES
  5.75%, 8/15/03                                               29,100                    27,586
  6.125%, 9/30/00                                               6,900                     6,801
  6.25%, 8/31/00                                                5,000                     4,952
  6.25%, 2/15/03                                               14,400                    14,085
  6.75%, 4/30/00                                                6,000                     6,048
  7.25%, 5/15/04                                               87,779                    90,508
  7.25%, 8/15/04                                               23,200                    23,914
  7.50%, 2/15/05                                               34,500                    36,133
  7.75%, 12/31/99                                              19,500                    20,262
  7.75%, 1/31/00                                                6,000                     6,233
  7.875%, 11/15/04                                             40,500                    43,335
EXPORT FUNDING TRUST
  (U.S. Government Guaranteed)
  8.21%, 2/27/02*                                               9,159                     9,606
GOVERNMENT EXPORT TRUST
  (U.S. Government Guaranteed)
  6.00%, 3/15/05*                                              10,922                    10,508
  7.46%, 12/15/05*                                             13,217                    13,468
GUARANTEED TRADE TRUST
  (U.S. Government Guaranteed)
  7.39%, 6/26/06*                                               2,383                     2,422
  7.80%, 8/15/06*                                               8,750                     9,027
  8.17%, 1/15/07*                                               3,500                     3,673
OVERSEAS PRIVATE INVESTMENT CORP.
  (U.S. Government Guaranteed)
  5.735%, 1/15/02*                                              5,500                     5,358
  5.94%, 6/20/06*                                               5,000                     4,759
  6.08%, 8/15/04*                                              22,500                    21,632
- -----------------------------------------------------------------------------------------------
TOTAL U.S. GOVERNMENT OBLIGATIONS
  (Cost $596,141)                                                                       590,288
- -----------------------------------------------------------------------------------------------
</TABLE>





                                       6
<PAGE>   7
<TABLE>
<CAPTION>
                                                                 Face                     Market
                                                               Amount                      Value
                                                                (000)                     (000)+
- ------------------------------------------------------------------------------------------------
<S>                                                         <C>                       <C>
TEMPORARY CASH INVESTMENT (3.1%)
- ------------------------------------------------------------------------------------------------
REPURCHASE AGREEMENT
  Collateralized by U.S. Government
   Obligations in a Pooled Cash  Account
   5.62%, 8/1/96
   (Cost $19,181)                                           $  19,181                  $ 19,181
- ------------------------------------------------------------------------------------------------
TOTAL INVESTMENTS (98.4%)
  (Cost $615,322)                                                                       609,469
- ------------------------------------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (1.6%)
- ------------------------------------------------------------------------------------------------
  Other Assets--Notes B and E                                                            16,661
  Liabilities--Note E                                                                    (6,530)
                                                                                      ---------
                                                                                         10,131
- ------------------------------------------------------------------------------------------------
NET ASSETS (100%)
- ------------------------------------------------------------------------------------------------
  Applicable to 61,816,327 outstanding
   $.001 par value shares
   (authorized 500,000,000 shares)                                                     $619,600
- ------------------------------------------------------------------------------------------------
NET ASSET VALUE PER SHARE                                                                $10.02
================================================================================================
</TABLE>

+See Note A to Financial Statements.
*The average maturity is shorter than the final maturity shown due to scheduled
  interim principal payments.


<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------
AT JULY 31, 1996, NET ASSETS CONSISTED OF:
- ------------------------------------------------------------------------------------------------
                                                               AMOUNT                       PER
                                                                (000)                     SHARE
                                                             --------                    ------
<S>                                                          <C>                         <C>
  PAID IN CAPITAL                                            $635,359                    $10.28
  UNDISTRIBUTED NET
    INVESTMENT INCOME                                              --                        --
  ACCUMULATED NET
    REALIZED LOSSES                                            (9,906)                     (.16)
  UNREALIZED DEPRECIATION OF
    INVESTMENTS--NOTE D                                        (5,853)                     (.10)
- ------------------------------------------------------------------------------------------------
NET ASSETS                                                   $619,600                    $10.02
- ------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
                                                                 Face                     Market
LONG-TERM                                                      Amount                      Value
U.S. TREASURY PORTFOLIO                                         (000)                     (000)+
- ------------------------------------------------------------------------------------------------
<S>                                                          <C>                     <C>
U.S. GOVERNMENT OBLIGATIONS (95.9%)
- ------------------------------------------------------------------------------------------------
U.S. TREASURY BONDS
  7.50%, 11/15/24                                            $  2,400                  $  2,527
  7.625%, 2/15/25                                               5,950                     6,370
  7.875%, 2/15/21                                              47,904                    52,164
  8.125%, 8/15/19                                              22,933                    25,552
  8.875%, 8/15/17                                              30,420                    36,291
  8.875%, 2/15/19                                              27,003                    32,344
  9.875%, 11/15/15                                              1,950                     2,523
  10.375%, 11/15/12                                            13,590                    17,151
- ------------------------------------------------------------------------------------------------
TOTAL U.S. GOVERNMENT OBLIGATIONS
  (Cost $175,276)                                                                       174,922
- ------------------------------------------------------------------------------------------------
TEMPORARY CASH INVESTMENT (1.1%)
- ------------------------------------------------------------------------------------------------
REPURCHASE AGREEMENT
  Collateralized by U.S. Government
    Obligations in a Pooled Cash Account
    5.62%, 8/1/96
    (Cost $1,982)                                               1,982                     1,982
- ------------------------------------------------------------------------------------------------
TOTAL INVESTMENTS (97.0%)
  (Cost $177,258)                                                                       176,904
- ------------------------------------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (3.0%)
- ------------------------------------------------------------------------------------------------
  Other Assets--Notes B and E                                                             7,942
  Liabilities--Note E                                                                    (2,401)
                                                                                      ---------
                                                                                          5,541
- ------------------------------------------------------------------------------------------------
NET ASSETS (100%)
- ------------------------------------------------------------------------------------------------
  Applicable to 18,381,643 outstanding
    $.001 par value shares
    (authorized 500,000,000 shares)                                                    $182,445
- ------------------------------------------------------------------------------------------------
NET ASSET VALUE PER SHARE                                                                 $9.93
================================================================================================
</TABLE>
+See Note A to Financial Statements.


<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------
AT JULY 31, 1996, NET ASSETS CONSISTED OF:
- ------------------------------------------------------------------------------------------------
                                                               AMOUNT                       PER
                                                                (000)                     SHARE
                                                             --------                   -------
<S>                                                          <C>                        <C>
  PAID IN CAPITAL                                            $183,857                    $10.00
  UNDISTRIBUTED NET
    INVESTMENT INCOME                                              --                        --
  ACCUMULATED
    NET REALIZED LOSSES                                        (1,058)                     (.05)
  UNREALIZED DEPRECIATION
    OF INVESTMENTS--NOTE D                                       (354)                     (.02)
- ------------------------------------------------------------------------------------------------
NET ASSETS                                                   $182,445                   $  9.93
- ------------------------------------------------------------------------------------------------
</TABLE>




                                       7
<PAGE>   8



                            STATEMENT OF OPERATIONS


<TABLE>
<CAPTION>
                                                                       U.S. TREASURY              SHORT-TERM
                                                                        MONEY MARKET           U.S. TREASURY
                                                                           PORTFOLIO               PORTFOLIO
- ------------------------------------------------------------------------------------------------------------
                                                                    Six Months Ended        Six Months Ended
                                                                       July 31, 1996           July 31, 1996
                                                                               (000)                   (000)
- ------------------------------------------------------------------------------------------------------------
<S>                                                                          <C>                 <C>
INVESTMENT INCOME   . . . . . . . . . . . . . . . . . . . . . . .
    INCOME                                                       
      Interest      . . . . . . . . . . . . . . . . . . . . . . .            $57,033              $  13,007
- ------------------------------------------------------------------------------------------------------------
                  Total Income  . . . . . . . . . . . . . . . . .             57,033                 13,007
- ------------------------------------------------------------------------------------------------------------
    EXPENSES        . . . . . . . . . . . . . . . . . . . . . . .
         The Vanguard Group--Note B                            
             Investment Advisory Services   . . . . . . . . . . .                128                     30
             Management and Administrative  . . . . . . . . . . .              1,090                    202
             Marketing and Distribution   . . . . . . . . . . . .                289                     64
         Custodian Fees   . . . . . . . . . . . . . . . . . . . .                 23                      4
         Taxes (other than income taxes)  . . . . . . . . . . . .                 79                     16
         Auditing Fees  . . . . . . . . . . . . . . . . . . . . .                  3                      3
         Shareholders' Reports  . . . . . . . . . . . . . . . . .                 13                      5
         Annual Meeting and Proxy Costs   . . . . . . . . . . . .                  1                     --
         Directors' Fees and Expenses   . . . . . . . . . . . . .                  3                      1
- ------------------------------------------------------------------------------------------------------------
                  Total Expenses  . . . . . . . . . . . . . . . .              1,629                    325
- ------------------------------------------------------------------------------------------------------------
                     Net Investment Income  . . . . . . . . . . .             55,404                 12,682
- ------------------------------------------------------------------------------------------------------------
REALIZED NET GAIN (LOSS)                                         
       Investment Securities Sold   . . . . . . . . . . . . . . .               (142)                 2,755
       Futures Contracts  . . . . . . . . . . . . . . . . . . . .                 --                     --
- ------------------------------------------------------------------------------------------------------------
                     Realized Net Gain (Loss)   . . . . . . . . .               (142)                 2,755
- ------------------------------------------------------------------------------------------------------------
CHANGE IN UNREALIZED APPRECIATION                                
  (DEPRECIATION)                                                 
           Investment Securities  . . . . . . . . . . . . . . . .                 --                (14,314)
           Futures Contracts  . . . . . . . . . . . . . . . . . .                 --                     --
- ------------------------------------------------------------------------------------------------------------
                     Change in Unrealized Appreciation           
                          (Depreciation)  . . . . . . . . . . . .                 --                (14,314)
- ------------------------------------------------------------------------------------------------------------
                     Net Increase (Decrease) in Net Assets       
                          Resulting from Operations   . . . . . .            $55,262              $   1,123
============================================================================================================
</TABLE>                                                  





                                       8
<PAGE>   9


<TABLE>
<CAPTION>
                                                                   INTERMEDIATE-TERM              LONG-TERM
                                                                       U.S. TREASURY          U.S. TREASURY
                                                                           PORTFOLIO              PORTFOLIO
- -----------------------------------------------------------------------------------------------------------
                                                                    Six Months Ended       Six Months Ended
                                                                       July 31, 1996          July 31, 1996
                                                                               (000)                  (000)
- -----------------------------------------------------------------------------------------------------------
<S>                                                                        <C>                    <C>
INVESTMENT INCOME   . . . . . . . . . . . . . . . . . . . . . . .
    INCOME
      Interest      . . . . . . . . . . . . . . . . . . . . . . .           $ 19,578              $   6,131
- -----------------------------------------------------------------------------------------------------------
                  Total Income    . . . . . . . . . . . . . . . .             19,578                  6,131
- -----------------------------------------------------------------------------------------------------------
    EXPENSES      . . . . . . . . . . . . . . . . . . . . . . . .
         The Vanguard Group--Note B   . . . . . . . . . . . . . .
             Investment Advisory Services   . . . . . . . . . . .                 41                     13
             Management and Administrative  . . . . . . . . . . .                289                     78
             Marketing and Distribution   . . . . . . . . . . . .                 81                     26
         Custodian Fees   . . . . . . . . . . . . . . . . . . . .                                        74
         Taxes (other than income taxes)  . . . . . . . . . . . .                 22                      7
         Auditing Fees  . . . . . . . . . . . . . . . . . . . . .                                        33
         Shareholders' Reports  . . . . . . . . . . . . . . . . .                                        62
         Annual Meeting and Proxy Costs   . . . . . . . . . . . .                 --                     --
         Directors' Fees and Expenses   . . . . . . . . . . . . .                  1                     --
- -----------------------------------------------------------------------------------------------------------
                  Total Expenses  . . . . . . . . . . . . . . . .                450                    133
- -----------------------------------------------------------------------------------------------------------
                     Net Investment Income  . . . . . . . . . . .             19,128                  5,998
- -----------------------------------------------------------------------------------------------------------
REALIZED NET GAIN (LOSS)    . . . . . . . . . . . . . . . . . . .
      Investment Securities Sold  . . . . . . . . . . . . . . . .                320                 (1,056)
      Futures Contracts   . . . . . . . . . . . . . . . . . . . .                 47                    --
- -----------------------------------------------------------------------------------------------------------
                     Realized Net Gain (Loss)   . . . . . . . . .                367                 (1,056)
- -----------------------------------------------------------------------------------------------------------
CHANGE IN UNREALIZED APPRECIATION
    (DEPRECIATION)      . . . . . . . . . . . . . . . . . . . . .
      Investment Securities   . . . . . . . . . . . . . . . . . .            (39,453)               (17,980)
      Futures Contracts   . . . . . . . . . . . . . . . . . . . .                 --                     --
- -----------------------------------------------------------------------------------------------------------
                     Change in Unrealized Appreciation
                          (Depreciation)  . . . . . . . . . . . .            (39,453)               (17,980)
- -----------------------------------------------------------------------------------------------------------
                     Net Increase (Decrease) in Net Assets
                          Resulting from Operations   . . . . . .           $(19,958)             $ (13,038)
===========================================================================================================
</TABLE>





                                       9
<PAGE>   10
                      STATEMENT OF CHANGES IN NET ASSETS
<TABLE>
<CAPTION>
                                                                                 U.S. TREASURY                           SHORT-TERM
                                                                                  MONEY MARKET                        U.S. TREASURY
                                                                                     PORTFOLIO                            PORTFOLIO
- ------------------------------------------------------------------------------------------------------------------------------------
                                                           SIX MONTHS ENDED         Year Ended   SIX MONTHS ENDED        Year Ended
                                                              JULY 31, 1996   January 31, 1996      JULY 31, 1996  January 31, 1996
                                                                      (000)              (000)              (000)             (000)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                              <C>              <C>                  <C>               <C>
INCREASE (DECREASE) IN NET ASSETS
OPERATIONS  . . . . . . . . . . . . . . . . . . . . .
  Net Investment Income   . . . . . . . . . . . . . .            $   55,404       $     87,829         $   12,682        $   23,904
  Realized Net Gain (Loss)  . . . . . . . . . . . . .                  (142)                73              2,755             1,729
  Change in Unrealized Appreciation                                                                                   
    (Depreciation)  . . . . . . . . . . . . . . . . .                    --                 --            (14,314)           15,462
- ------------------------------------------------------------------------------------------------------------------------------------
    Net Increase (Decrease) in Net Assets                                                                            
      Resulting from Operations   . . . . . . . . . .                55,262             87,902              1,123            41,095
- ------------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS   . . . . . . . . . . . . . . . . . . .                                                                
  Net Investment Income   . . . . . . . . . . . . . .               (55,404)           (87,829)           (12,682)          (23,904)
  Realized Net Gain   . . . . . . . . . . . . . . . .                    --                 --                 --                --
- ------------------------------------------------------------------------------------------------------------------------------------
    Total Distributions   . . . . . . . . . . . . . .               (55,404)           (87,829)           (12,682)          (23,904)
- ------------------------------------------------------------------------------------------------------------------------------------
CAPITAL SHARE TRANSACTIONS (1)  . . . . . . . . . . .                                                                
  Issued    . . . . . . . . . . . . . . . . . . . . .             1,647,721          1,644,118            151,572           264,098
  Issued in Lieu of Cash Distributions  . . . . . . .                52,417             82,822              9,366            18,618
  Redeemed  . . . . . . . . . . . . . . . . . . . . .              (869,538)        (1,320,063)          (101,941)         (206,839)
- ------------------------------------------------------------------------------------------------------------------------------------
    Net Increase from                                                                                                
      Capital Share Transactions  . . . . . . . . . .               830,600            406,877             58,997            75,877
- ------------------------------------------------------------------------------------------------------------------------------------
      Total Increase (Decrease)   . . . . . . . . . .               830,458            406,950             47,438            93,068
- ------------------------------------------------------------------------------------------------------------------------------------
NET ASSETS                                                                                                           
  Beginning of Period   . . . . . . . . . . . . . . .             1,778,344          1,371,394            426,025           332,957
- ------------------------------------------------------------------------------------------------------------------------------------
  End of Period   . . . . . . . . . . . . . . . . . .            $2,608,802       $  1,778,344         $  473,463        $  426,025
====================================================================================================================================
  (1)Shares Issued and Redeemed   . . . . . . . . . .                                                                
     Issued     . . . . . . . . . . . . . . . . . . .             1,647,721          1,644,118             15,144            26,346
     Issued in Lieu of Cash Distributions   . . . . .                52,417             82,822                936             1,849
     Redeemed   . . . . . . . . . . . . . . . . . . .              (869,538)        (1,320,063)           (10,183)          (20,626)
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                    830,600            406,877              5,897             7,569
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>




                                       10
<PAGE>   11


<TABLE>
<CAPTION>
                                                          INTERMEDIATE-TERM                             LONG-TERM
                                                              U.S. TREASURY                         U.S. TREASURY
                                                                  PORTFOLIO                             PORTFOLIO
- ------------------------------------------------------------------------------------------------------------------------------------
                                                           SIX MONTHS ENDED         Year Ended   SIX MONTHS ENDED         Year Ended
                                                              JULY 31, 1996   January 31, 1996      JULY 31, 1996   January 31, 1996
                                                                      (000)              (000)              (000)              (000)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                <C>               <C>                <C>              <C>
INCREASE (DECREASE) IN NET ASSETS                                                                                        
OPERATIONS  . . . . . . . . . . . . . . . . . . . . .                                                                    
  Net Investment Income   . . . . . . . . . . . . . .              $ 19,128          $  32,104           $  5,998          $ 10,585
  Realized Net Gain (Loss)  . . . . . . . . . . . . .                   367              6,041             (1,056)            4,194
  Change in Unrealized Appreciation                                                                                      
    (Depreciation)  . . . . . . . . . . . . . . . . .               (39,453)            46,712            (17,980)           23,788
- ------------------------------------------------------------------------------------------------------------------------------------
      Net Increase (Decrease) in Net Assets                                                                              
        Resulting from Operations   . . . . . . . . .               (19,958)            84,857            (13,038)           38,567
- ------------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS . . . . . . . . . . . . . . . . . . . .                                                                    
  Net Investment Income   . . . . . . . . . . . . . .               (19,128)           (32,104)            (5,998)          (10,585)
  Realized Net Gain   . . . . . . . . . . . . . . . .                    --                 --               (527)           (1,495)
- ------------------------------------------------------------------------------------------------------------------------------------
     Total Distributions  . . . . . . . . . . . . . .               (19,128)           (32,104)            (6,525)          (12,080)
- ------------------------------------------------------------------------------------------------------------------------------------
CAPITAL SHARE TRANSACTIONS (1)  . . . . . . . . . . .                                                                    
  Issued  . . . . . . . . . . . . . . . . . . . . . .               190,565            320,851             88,851           145,811
  Issued in Lieu of Cash Distributions  . . . . . . .                13,492             23,082              4,531             8,307
  Redeemed  . . . . . . . . . . . . . . . . . . . . .              (130,056)          (169,135)           (77,252)         (130,533)
- ------------------------------------------------------------------------------------------------------------------------------------
     Net Increase from                                                                                                   
        Capital Share Transactions  . . . . . . . . .                74,001            174,798             16,130            23,585
- ------------------------------------------------------------------------------------------------------------------------------------
        Total Increase (Decrease)   . . . . . . . . .                34,915            227,551             (3,433)           50,072
- ------------------------------------------------------------------------------------------------------------------------------------
NET ASSETS  . . . . . . . . . . . . . . . . . . . . .                                                                    
  Beginning of Period   . . . . . . . . . . . . . . .               584,685            357,134            185,878           135,806
- ------------------------------------------------------------------------------------------------------------------------------------
  End of Period   . . . . . . . . . . . . . . . . . .              $619,600           $584,685           $182,445          $185,878
====================================================================================================================================
  (1)Shares Issued and Redeemed   . . . . . . . . . .                                                                    
     Issued   . . . . . . . . . . . . . . . . . . . .                18,655             31,613              8,755            14,158
     Issued in Lieu of Cash Distributions   . . . . .                 1,334              2,244                451               794
     Redeemed   . . . . . . . . . . . . . . . . . . .               (12,840)           (16,469)            (7,628)          (12,599)
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                      7,149             17,388              1,578             2,353
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>




                                       11
<PAGE>   12
                              FINANCIAL HIGHLIGHTS


<TABLE>
<CAPTION>
                                                                              U.S. TREASURY MONEY MARKET PORTFOLIO
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                              Year Ended               December 14,
                                                                                              January 31,                  1992, to
                                                          SIX MONTHS ENDED       ------------------------------------   January 31, 
For a Share Outstanding Throughout Each Period               JULY 31, 1996         1996            1995         1994           1993
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                                                                <C>            <C>           <C>           <C>           <C>
NET ASSET VALUE, BEGINNING OF PERIOD      . . . . . . . . .         $ 1.00         $1.00          $1.00        $1.00         $1.00
                                                                   -------        ------        -------       ------        ------
INVESTMENT OPERATIONS
  Net Investment Income   . . . . . . . . . . . . . . . . .           .025          .055           .041         .029          .004
  Net Realized and Unrealized Gain (Loss) on Investments  .             --            --             --           --            --
                                                                   -------        ------        -------       ------        ------
      TOTAL FROM INVESTMENT OPERATIONS    . . . . . . . . .           .025          .055           .041         .029          .004
- -----------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net Investment Income  . . . . . . . . . .          (.025)        (.055)         (.041)       (.029)        (.004)
  Distributions from Realized Capital Gains . . . . . . . .            --             --             --           --            --
                                                                   -------        ------        -------       ------        ------
      TOTAL DISTRIBUTIONS   . . . . . . . . . . . . . . . .          (.025)        (.055)         (.041)       (.029)        (.004)
- -----------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD  . . . . . . . . . . . . . .         $1.00          $1.00          $1.00        $1.00         $1.00
===================================================================================================================================
TOTAL RETURN  . . . . . . . . . . . . . . . . . . . . . . .         +2.56%        +5.66%         +4.19%       +2.99%        +0.41%
- -----------------------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL DATA
- ------------------------    
Net Assets, End of Period (Millions)  . . . . . . . . . . .         $2,609        $1,778         $1,371         $860          $149
Ratio of Total Expenses to Average Net Assets . . . . . . .          .15%*          .15%           .15%         .15%         .15%*
Ratio of Net Investment Income to Average Net Assets  . . .         5.08%*         5.50%          4.21%        3.06%        3.12%*
Portfolio Turnover Rate . . . . . . . . . . . . . . . . . .            N/A           N/A            N/A          N/A           N/A
- -----------------------------------------------------------------------------------------------------------------------------------
*Annualized.
- -----------------------------------------------------------------------------------------------------------------------------------
<CAPTION>
                                                                              SHORT-TERM U.S. TREASURY PORTFOLIO
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                              Year Ended               December 14,
                                                                                              January 31,                  1992, to
                                                          SIX MONTHS ENDED       ------------------------------------   January 31, 
For a Share Outstanding Throughout Each Period               JULY 31, 1996         1996            1995         1994           1993
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                                                                <C>          <C>             <C>           <C>           <C>
NET ASSET VALUE, BEGINNING OF PERIOD    . . . . . . . . . .        $ 10.23       $  9.77         $ 10.26      $10.17        $10.00
                                                                   -------       -------         -------      -------       ------
INVESTMENT OPERATIONS                                                                                                
  Net Investment Income   . . . . . . . . . . . . . . . . .           .292          .626           .518         .448          .065
  Net Realized and Unrealized Gain (Loss) on Investments  .          (.270)         .460          (.468)        .101          .170
                                                                   -------       -------         -------      -------       ------
      TOTAL FROM INVESTMENT OPERATIONS    . . . . . . . . .           .022         1.086           .050         .549          .235
- -----------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net Investment Income  . . . . . . . . . .          (.292)        (.626)         (.518)       (.448)        (.065)
  Distributions from Realized Capital Gains . . . . . . . .             --            --          (.022)       (.011)           --
                                                                   -------       -------         -------      -------       ------
      TOTAL DISTRIBUTIONS   . . . . . . . . . . . . . . . .          (.292)        (.626)         (.540)       (.459)        (.065)
- -----------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD    . . . . . . . . . . . . .        $  9.96       $ 10.23         $ 9.77       $10.26        $10.17
===================================================================================================================================
TOTAL RETURN  . . . . . . . . . . . . . . . . . . . . . . .         +0.24%       +11.41%         +0.57%       +5.50%        +2.35%
- -----------------------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL DATA
- ------------------------    
Net Assets, End of Period (Millions)  . . . . . . . . . . .           $473          $426           $333         $252           $63
Ratio of Total Expenses to Average Net Assets . . . . . . .          .15%*          .15%           .15%         .15%         .15%*
Ratio of Net Investment Income to Average Net Assets  . . .         5.84%*         6.22%          5.30%        4.38%        4.87%*
Portfolio Turnover Rate     . . . . . . . . . . . . . . . .           95%*           95%           129%          90%            7%
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
*Annualized.





                                       12
<PAGE>   13
<TABLE>
<CAPTION>
                                                                          INTERMEDIATE-TERM U.S. TREASURY PORTFOLIO
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                                Year Ended             December 14,
                                                                                                January 31,                1992, to
                                                          SIX MONTHS ENDED       ------------------------------------   January 31, 
For a Share Outstanding Throughout Each Period               JULY 31, 1996          1996           1995         1994           1993
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                                                                 <C>          <C>            <C>           <C>           <C>
NET ASSET VALUE, BEGINNING OF PERIOD    . . . . . . . . . .         $10.70       $  9.58         $10.58       $10.29        $10.00
                                                                    ------       -------         ------       ------        -------
INVESTMENT OPERATIONS
  Net Investment Income   . . . . . . . . . . . . . . . . .           .322          .665           .598         .578          .084
  Net Realized and Unrealized Gain (Loss) on Investments  .          (.680)        1.120          (.995)        .418          .290
                                                                    ------       -------         ------       ------        -------
      TOTAL FROM INVESTMENT OPERATIONS      . . . . . . . .          (.358)        1.785          (.397)        .996          .374
- -----------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net Investment Income  . . . . . . . . . .          (.322)        (.665)         (.598)       (.578)        (.084)
  Distributions from Realized Capital Gains . . . . . . . .             --            --          (.005)       (.128)           --
                                                                    ------       -------         ------       ------        -------
      TOTAL DISTRIBUTIONS   . . . . . . . . . . . . . . . .          (.322)        (.665)         (.603)       (.706)        (.084)
- -----------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD    . . . . . . . . . . . . .         $10.02        $10.70        $  9.58       $10.58        $10.29
===================================================================================================================================
TOTAL RETURN    . . . . . . . . . . . . . . . . . . . . . .         -3.34%       +19.16%         -3.67%       +9.89%        +3.75%
- -----------------------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL DATA
- ------------------------
Net Assets, End of Period (Millions)  . . . . . . . . . . .           $620          $585           $357         $332           $78
Ratio of Total Expenses to Average Net Assets . . . . . . .          .15%*          .15%           .15%         .15%         .15%*
Ratio of Net Investment Income to Average Net Assets  . . .         6.35%*         6.49%          6.15%        5.46%        6.31%*
Portfolio Turnover Rate . . . . . . . . . . . . . . . . . .           65%*           64%           134%         102%            0%
- -----------------------------------------------------------------------------------------------------------------------------------
*Annualized.
<CAPTION>
                                                                                   LONG-TERM U.S. TREASURY PORTFOLIO
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                                Year Ended             December 14,
                                                                                                January 31,                1992, to
                                                          SIX MONTHS ENDED       ------------------------------------   January 31, 
For a Share Outstanding Throughout Each Period               JULY 31, 1996          1996           1995         1994           1993
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                                                                <C>           <C>            <C>          <C>            <C>
NET ASSET VALUE, BEGINNING OF PERIOD    . . . . . . . . . .         $11.06        $ 9.40         $10.90       $10.30        $10.00
                                                                   -------       -------        -------      -------        -------
INVESTMENT OPERATIONS
  Net Investment Income   . . . . . . . . . . . . . . . . .           .341          .691           .670         .709          .096
  Net Realized and Unrealized Gain (Loss) on Investments  .         (1.100)        1.749         (1.405)        .881          .300
                                                                   -------       -------        -------      -------        -------
      TOTAL FROM INVESTMENT OPERATIONS    . . . . . . . . .          (.759)        2.440          (.735)       1.590          .396
- -----------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTION
  Dividends from Net Investment Income  . . . . . . . . . .          (.341)        (.691)         (.670)       (.709)        (.096)
  Distributions from Realized Capital Gains . . . . . . . .          (.030)        (.089)         (.095)       (.281)           --
                                                                   -------       -------        -------      -------        -------
      TOTAL DISTRIBUTIONS     . . . . . . . . . . . . . . .          (.371)        (.780)         (.765)       (.990)        (.096)
- -----------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD    . . . . . . . . . . . . .         $ 9.93        $11.06         $ 9.40       $10.90        $10.30
===================================================================================================================================
TOTAL RETURN    . . . . . . . . . . . . . . . . . . . . . .         -6.85%       +26.74%         -6.60%      +15.90%        +3.97%
- -----------------------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL DATA
- ------------------------
Net Assets, End of Period (Millions)  . . . . . . . . . . .           $182          $186           $136          $99           $49
Ratio of Total Expenses to Average Net Assets . . . . . . .          .15%*          .15%           .15%         .15%         .15%*
Ratio of Net Investment Income to Average Net Assets  . . .         6.76%*         6.66%          7.06%        6.58%        7.22%*
Portfolio Turnover Rate     . . . . . . . . . . . . . . . .           65%*          125%            44%          51%           17%
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
*Annualized.





                                       13
<PAGE>   14
                         NOTES TO FINANCIAL STATEMENTS


Vanguard Admiral Funds is registered under the Investment Company Act of 1940
as a diversified open-end investment company and consists of the U.S. Treasury
Money Market, Short-Term U.S. Treasury, Intermediate-Term U.S. Treasury, and
Long-Term U.S. Treasury Portfolios.

A.       The following significant accounting policies are in conformity with
generally accepted accounting principles for investment companies. Such
policies are consistently followed by the Fund in the preparation of financial
statements.

1.       SECURITY VALUATION: U.S. Treasury Money Market Portfolio: Securities
         are stated at amortized cost which approximates market value. Other
         Portfolios: Securities are valued utilizing the latest bid prices and
         on the basis of a matrix system (which considers such factors as
         security prices, yields, maturities, and ratings), both as furnished
         by independent pricing services. Temporary cash investments are valued
         at amortized cost which approximates market value.

2.       FEDERAL INCOME TAXES: Each Portfolio of the Fund intends to continue
         to qualify as a regulated investment company and distribute all of its
         taxable income. Accordingly, no provision for Federal income taxes is
         required in the financial statements.

3.       REPURCHASE AGREEMENTS: The Short-Term U.S. Treasury, Intermediate-Term
         U.S. Treasury, and Long-Term U.S. Treasury Portfolios of the Fund,
         along with other members of The Vanguard Group, transfer uninvested
         cash balances into a Pooled Cash Account, the daily aggregate of which
         is invested in repurchase agreements secured by U.S. Government
         obligations.  Securities pledged as collateral for repurchase
         agreements are held by a custodian bank until maturity of each
         repurchase agreement. Provisions of each agreement require that the
         market value of the collateral is sufficient in the event of default;
         however, in the event of default or bankruptcy by the other party to
         the agreement, realization and/or retention of the collateral may be
         subject to legal proceedings.

4.       FUTURES: The Short-Term U.S. Treasury, Intermediate-Term U.S.
         Treasury, and Long-Term U.S. Treasury Portfolios utilize Municipal
         Bond Index and U.S. Treasury Bond futures contracts to a limited
         extent, with the objectives of enhancing returns, managing interest
         rate risk, maintaining liquidity, and minimizing transaction costs.
         The Portfolios may purchase futures  contracts instead of bonds when
         futures contracts are believed to be priced more attractively than
         bonds. The Portfolios may also seek to take advantage of price
         differences among bond market sectors by simultaneously buying futures
         (or bonds) of one market sector and selling futures (or bonds) of
         another sector. Futures contracts may also be used to simulate a fully
         invested position in the underlying bonds while maintaining a cash
         balance for liquidity.

         The primary risks associated with the use of futures contracts are
         imperfect correlation between changes in market values of bonds held
         by the Portfolios and the prices of futures contracts, and the
         possibility of an illiquid market. Futures contracts are valued based
         upon their quoted daily settlement prices. Fluctuations in the values
         of futures contracts are recorded as unrealized appreciation
         (depreciation) until terminated at which time realized gains (losses)
         are recognized.  Unrealized appreciation (depreciation) related to
         open futures contracts is required to be treated as realized gain
         (loss) for Federal income tax purposes.

5.       OTHER: Security transactions are accounted for on the date the
         securities are purchased or sold. Costs used in determining realized
         gains and losses on sales of investment securities are those of
         specific securities sold. Discounts and premiums on securities
         purchased are amortized to interest income over the lives of the
         respective securities. Dividends from net investment income are





                                       14
<PAGE>   15
         declared on a daily basis payable on the first business day of the
         following month. Annual distributions from realized gains, if any, are
         recorded on the ex-dividend date.

B.       The Vanguard Group furnishes at cost investment advisory, corporate
management, administrative, marketing, and distribution services. The costs of
such services are allocated to the Fund under methods approved by the Board of
Directors. At July 31, 1996, the Fund had contributed capital of $377,000 to
Vanguard (included in Other Assets), representing 1.9% of Vanguard's
capitalization.  The Fund's directors and officers are also directors and
officers of Vanguard.

C.       During the six months ended July 31, 1996, purchases and sales of U.S.
Government securities other than temporary cash investments were:

<TABLE>
<CAPTION>
- ---------------------------------------------------------------      
                                                (000)                
                                    ---------------------------      
Portfolio                           Purchases             Sales      
- ---------------------------------------------------------------      
<S>                                  <C>               <C>           
SHORT-TERM U.S. TREASURY             $310,311          $196,096      
INTERMEDIATE-TERM U.S. TREASURY       256,410           189,773      
LONG-TERM U.S. TREASURY                77,416            56,339      
- ---------------------------------------------------------------      
</TABLE>

At January 31, 1996, capital loss carryforwards available to offset  future net
capital gains were:

<TABLE>
<CAPTION>
- ---------------------------------------------------------------  
                                 Expiration Fiscal               
                                  Year(s) Ending        Amount   
Portfolio                           January 31           (000)   
- ---------------------------------------------------------------  
<S>                                  <C>               <C>       
SHORT-TERM U.S. TREASURY             2003-2004         $  5,805  
INTERMEDIATE-TERM U.S. TREASURY        2003              10,274  
- ---------------------------------------------------------------  
</TABLE>

D.       At  July 31, 1996, net unrealized depreciation of investment
securities for financial reporting and Federal income tax purposes was:

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------        
                                                (000)                  
                          ---------------------------------------------        
                                                                Net            
                              Appreciated    Depreciated    Unrealized         
Portfolio                     Securities     Securities    Depreciation        
- -----------------------------------------------------------------------        
<S>                             <C>         <C>              <C>               
SHORT-TERM                                                                     
  U.S. TREASURY                 $  543      $  (3,198)       $(2,655)          
INTERMEDIATE-TERM                                                              
  U.S. TREASURY                  7,001        (12,854)        (5,853)          
LONG-TERM                                                                      
  U.S. TREASURY                  1,573         (1,927)          (354)          
- -----------------------------------------------------------------------        
</TABLE>                                                                       

E.       The market value of securities on loan to broker/dealers at July 31,
1996, and collateral received with respect to such loans were:


<TABLE>
<CAPTION>
- ------------------------------------------------------------------------
                                             (000)
                             -------------------------------------------
                                               Collateral Received
                               Market        ---------------------------
                              Value of                   Market Value of
                               Loaned                     U.S. Treasury
Portfolio                    Securities        Cash        Securities
- ------------------------------------------------------------------------
<S>                            <C>            <C>           <C>
INTERMEDIATE-TERM
  U.S. TREASURY                $32,185        $4,347        $28,407
LONG-TERM U.S. TREASURY          1,972         1,995             --
- ------------------------------------------------------------------------
</TABLE>

Security loans are required to be secured at all times by collateral at least
equal to the market value of securities loaned; however, in the event of
default or bankruptcy by the other party to the agreement, realization and/or
retention of the collateral may be subject to legal proceedings.





                                       15
<PAGE>   16

                          THE VANGUARD FAMILY OF FUNDS

                               FIXED INCOME FUNDS

MONEY MARKET FUNDS
Vanguard Admiral Funds
U.S. Treasury Money
  Market Portfolio
Vanguard Money Market Reserves

TAX-EXEMPT MONEY MARKET FUNDS
Vanguard Municipal Bond Fund
Money Market Portfolio
Vanguard State Tax-Free Funds
Money Market Portfolios
  (CA, NJ, OH, PA)

TAX-EXEMPT INCOME FUNDS
Vanguard Municipal Bond Fund
Vanguard State Tax-Free Funds
Insured Longer-Term Portfolios
  (CA, FL, NJ, NY, OH, PA)

INCOME FUNDS
Vanguard Admiral Funds
Vanguard Fixed Income
  Securities Fund
Vanguard Preferred Stock Fund

                           EQUITY AND BALANCED FUNDS

GROWTH AND INCOME FUNDS
Vanguard Convertible
  Securities Fund
Vanguard Equity Income Fund
Vanguard Quantitative Portfolios
Vanguard Selected Value Portfolio
Vanguard/Trustees' Equity Fund
U.S. Portfolio
Vanguard/Windsor Fund
Vanguard/Windsor II

BALANCED FUNDS
Vanguard Asset Allocation Fund
Vanguard LifeStrategy Portfolios
Income Portfolio
Conservative Growth Portfolio
Moderate Growth Portfolio
Growth Portfolio
Vanguard STAR Portfolio
Vanguard/Wellesley Income Fund
Vanguard/Wellington Fund

GROWTH FUNDS
Vanguard/Morgan Growth Fund
Vanguard/PRIMECAP Fund
Vanguard U.S. Growth Portfolio

AGGRESSIVE GROWTH FUNDS
Vanguard Explorer Fund
Vanguard Horizon Fund
Global Equity Portfolio
Global Asset Allocation Portfolio
Capital Opportunity Portfolio
Aggressive Growth Portfolio
Vanguard Specialized Portfolios

INTERNATIONAL FUNDS
Vanguard International
  Growth Portfolio
Vanguard/Trustees' Equity Fund
International Portfolio

                                  INDEX FUNDS

Vanguard Index Trust
Total Stock Market Portfolio
500 Portfolio
Extended Market Portfolio
Growth Portfolio
Value Portfolio
Small Capitalization Stock Portfolio

Vanguard International Equity
  Index Fund
European Portfolio
Pacific Portfolio
Emerging Markets Portfolio
Vanguard Bond Index Fund
Vanguard Tax-Managed Fund
Vanguard Balanced Index Fund

                          [THE VANGUARD GROUP LOGO]
                                      
        Vanguard Financial Center      Valley Forge, Pennsylvania 19482
                                      
         New Account Information:      Shareholder Account Services:
                 1 (800) 662-7447      1 (800) 662-2739

This Report has been prepared for shareholders and may be distributed to others
  only if preceded or accompanied by a current prospectus. All Funds in the
               Vanguard Family are offered by prospectus only.

                                  Q122-7/96

                                       


VANGUARD 
ADMIRAL FUNDS 

SEMI-ANNUAL REPORT
JULY 31, 1996


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