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                                                                    Exhibit 3.17


                            CERTIFICATE OF AMENDMENT
                                     TO THE
                          CERTIFICATE OF INCORPORATION

                                       OF

                              BROMAR SERVICES, INC.

                                  JULY 13, 1998


                  BroMar Services, Inc., a corporation organized and existing
under and by virtue of the General Corporation Law of the State of Delaware (the
"Corporation"), does hereby certify that:

                  FIRST:   The name of the Corporation is BroMar Services, Inc.

                  SECOND: The Board of Directors of the Corporation, by the
consent of all of its members, adopted a resolution declaring advisable that the
following Amendment to the Certificate of Incorporation of the Corporation be
submitted to the stockholders for approval in accordance with Section 242 of the
General Corporation Law of the State of Delaware:

                  RESOLVED, that the Board of Directors deems it advisable to
amend the Corporation's Certificate of Incorporation:

                  Article 1 of the Certificate of Incorporation shall be deleted
in its entirety and replaced with the following language:

1.       Name.    The name of the corporation is ASNSC, Inc.

                  THIRD: The aforesaid amendment was duly adopted by the
Corporation's stockholders in accordance with the applicable provisions of
Sections 228 and 242(b)(1) of the General Corporation Law of the State of
Delaware.

                  IN WITNESS WHEREOF, BroMar Services, Inc. has caused this
certificate to be executed by the undersigned this 13th day of July, 1998.


                                                     BROMAR SERVICES, INC.