EXHIBIT A

                                                                       EXHIBIT A

                                    AGREEMENT

                          JOINT FILING OF SCHEDULE 13G

      The undersigned hereby agree to jointly prepare and file with regulatory
authorities a Schedule 13G and any future amendments thereto reporting each of
the undersigned's ownership of securities of L-3 Communications Holdings, Inc.
and hereby affirms that such Schedule 13G is being filed on behalf of each of
the undersigned. The undersigned acknowledge that each shall be responsible for
the timely filing of such amendments, and for the completeness and accuracy of
the information concerning him or it contained therein, but shall not be
responsible for the completeness and accuracy of the information concerning the
other, except to the extent that he or it knows or has reason to believe that
such information is inaccurate.

                                        PERRY CORP.


Dated: June 26, 1998                    By: /s/ Xxxxxxx X. Xxxxx
       New York, New York                   ----------------------------
                                        Name:  Xxxxxxx X. Xxxxx
                                        Title: President



Dated: June 26, 1998                    /s/ Xxxxxxx X. Xxxxx
       New York, New York               ---------------------------------
                                        Xxxxxxx X. Xxxxx