(a) 10 U.S.C. 2858 requires agency head approval to expedite the completion date of a contract funded by a Military Construction Appropriations Act, if additional costs are involved. This approval authority may not be redelegated. The approval authority must—

1. (1) Certify that the additional expenditures are necessary to protect the National interest; and
2. (2) Establish a reasonable completion date for the project.