48 C.F.R. § 3001.106
(a) The Office of Management and Budget (OMB) has assigned the following control numbers that must appear on the upper right-hand corner of the face page of each solicitation, contract, modification, and order:
OMB Control No. 1600-002 (Contract related forms) OMB Control No. 1600-005 (Offeror submissions) OMB Control No. 1600-003 (Contractor submissions) OMB Control No. 1600-004 (Protests) OMB Control No. 1601-0023 (Safeguarding of Controlled Unclassified Information)
[68 FR 67871, Dec. 4, 2003, as amended at 88 FR 40596, June 21, 2023]