10 U.S.C. § 4751: Determinations and decisions

Determinations and decisions required to be made under any chapter 137 legacy provision by the head of an agency may be made for an individual purchase or contract or, except to the extent expressly prohibited by another provision of law, for a class of purchases or contracts. Such determinations and decisions are final. Each determination or decision under section 3531(a), 3803, or 3841(c)(2)(B) of this title shall be based on a written finding by the person making the determination or decision. The finding shall set out facts and circumstances that support the determination or decision. Each finding referred to in paragraph (1) is final. The head of the agency making such finding shall maintain a copy of the finding for not less than 6 years after the date of the determination or decision. Except as provided in subsection (b), the amendments made by this title [see Tables for classification] shall apply with respect to any solicitation for bids or proposals issued after March 31, 1985 . The amendments made by section 2713 [amending section 759 of former Title 40, Public Buildings, Property, and Works, and enacting provisions set out as a note under section 759 of former Title 40] and subtitle D [enacting sections 3551 to 3556 of Title 31, Money and Finance] shall apply with respect to any protest filed after January 14, 1985 .”