27 C.F.R. § 27.181 – General.

(a) The United States or any of its Government agencies may, upon filing proper customs entry, withdraw imported distilled spirits free of tax from customs custody, as authorized by 26 U.S.C. 5313 and under the provisions of this subpart. Before any distilled spirits may be withdrawn, a permit to procure the spirits shall be obtained from the appropriate TTB officer. A bond is not required for any Government agency to procure and withdraw spirits free of tax under this subpart.
(b) The provisions of subpart N of part 22 of this chapter cover the withdrawal of domestically produced tax-free spirits for use of the United States or any of its Government agencies.
(Sec. 201, Pub. L. 85-859, 72 Stat. 1372, as amended, 1375, as amended (26 U.S.C. 5273, 5313))