EXHIBIT 23.8

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

    As independent public accountants, we hereby consent to the use of our
report dated May 17, 1999 on the financial statements of Commonwealth Scientific
Corporation (and to all references to our Firm) included in this Registration
Statement on Form S-4.

                                          /s/ Arthur Andersen LLP

Vienna, Virginia
March 30, 2000