
<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<CIK>     0001090709
<NAME>    ANTEON CORPORATION

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                           2,764
<SECURITIES>                                    10,533
<RECEIVABLES>                                  102,469
<ALLOWANCES>                                   (3,527)
<INVENTORY>                                          0
<CURRENT-ASSETS>                               106,459
<PP&E>                                          24,216
<DEPRECIATION>                                 (5,569)
<TOTAL-ASSETS>                                 287,107
<CURRENT-LIABILITIES>                         (62,857)
<BONDS>                                      (174,727)
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             0
<OTHER-SE>                                          48
<TOTAL-LIABILITY-AND-EQUITY>                   287,107
<SALES>                                              0
<TOTAL-REVENUES>                               145,609
<CGS>                                        (128,576)
<TOTAL-COSTS>                                (138,961)
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             (6,312)
<INCOME-PRETAX>                                  1,131
<INCOME-TAX>                                       597
<INCOME-CONTINUING>                                534
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                  (463)
<CHANGES>                                            0
<NET-INCOME>                                        71
<EPS-BASIC>                                          0
<EPS-DILUTED>                                        0


</TABLE>
