41 C.F.R. § 102-36.175
(a) You must report to GSA all excess aircraft, regardless of condition or dollar value, and provide the following information on the SF 120:
(3) Whether or not the:
(4) For military aircraft, indicate Category A, B, or C as designated by the Department of Defense (DoD), as follows:
Table 1 to Paragraph (a)(4)
