EXHIBIT 99


               CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350(a)

In connection with the accompanying Annual Report of the USF Employees' 401K
Retirement Plan (the Plan) on Form 11-K for the period ended December 31, 2002,
as filed with the Securities and Exchange Commission (the SEC), I, Christopher
L. Ellis, a member of the Plan Committee administering the Plan hereby certify
pursuant to 18 U.S.C. Section 1350(a), as adopted pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, to the best of my knowledge and belief, that:

         (1) such Annual Report on Form 11-K for the year ended December 31,
         2002, fully complies with the requirements of section 13(a) or 15(d) of
         the Securities Exchange Act of 1934; and

         (2) the information contained in such Annual Report on Form 11-K for
         the year ended December 31, 2002, fairly presents, in all material
         respects, the financial condition and results of operations of the
         Plan.

A signed original of this written statement has been provided to the Plan and
USF Corporation, the issuer, and will be retained and furnished to the SEC or
its staff upon request.



                                                  /s/ Christopher L. Ellis
                                                  --------------------------
                                                  Christopher L. Ellis
                                                  Member of the Plan Committee
                                                  administering the USF
                                                  Employees' 401K Retirement
                                                  Plan

Date: June 26, 2003