<ARTICLE> 5
<CIK>  0001056239
<NAME> L-3 COMMUNICATIONS HOLDINGS, INC.
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               DEC-31-1999
<CASH>                                          42,788
<SECURITIES>                                         0
<RECEIVABLES>                                  387,288
<ALLOWANCES>                                  (13,933)
<INVENTORY>                                    110,818
<CURRENT-ASSETS>                               567,707
<PP&E>                                         191,409
<DEPRECIATION>                                  50,438
<TOTAL-ASSETS>                               1,633,771
<CURRENT-LIABILITIES>                          318,306
<BONDS>                                        605,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       483,694
<OTHER-SE>                                      99,481
<TOTAL-LIABILITY-AND-EQUITY>                 1,633,771
<SALES>                                              0
<TOTAL-REVENUES>                             1,405,462
<CGS>                                                0
<TOTAL-COSTS>                                1,254,976
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              60,590
<INCOME-PRETAX>                                 95,430
<INCOME-TAX>                                    36,741
<INCOME-CONTINUING>                             58,689
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    58,689
<EPS-BASIC>                                       1.83
<EPS-DILUTED>                                     1.75