48 C.F.R. § 207.470
(a) Requirement for authorization of certain contracts relating to vessels, aircraft, and combat vehicles. The contracting officer shall not enter into any contract for the lease or charter of any vessel, aircraft, or combat vehicle, or any contract for services that would require the use of the contractor's vessel, aircraft, or combat vehicle, unless the Secretary of the military department concerned has satisfied the requirements of 10 U.S.C. 3671-3677, when—
(b) Limitation on contracts with terms of 18 months or more. As required by 10 U.S.C. 3678, the contracting officer shall not enter into any contract for any vessel, aircraft, or vehicle, through a lease, charter, or similar agreement with a term of 18 months or more, or extend or renew any such contract for a term of 18 months or more, unless the head of the contracting activity has—
[61 FR 16879, Apr. 18, 1996, as amended at 61 FR 50451, Sept. 26, 1996; 74 FR 34266, July 15, 2009; 87 FR 76990, Dec. 16, 2022]