19 C.F.R. § 141.102
Entry or withdrawal for consumption in the following situations may be made without depositing the estimated Customs duties, or estimated taxes, or both, as specifically noted:
(d) Government entries. If a shipment is entered or withdrawn for consumption by a U.S. Government department or agency, or an authorized representative thereof, no deposit of estimated Customs duties or taxes shall be required if a stipulation is furnished in lieu of the bond. The proper department or agency will then be billed after liquidation of the entry for any duties or charges due. The stipulation shall be in the following form:
I, ____________________________________ (title), a duly authorized representative of the (name of U.S. Government department or agency) stipulate and agree on behalf of such department or agency that all applicable provisions of the Tariff Act of 1930, as amended, and the regulations thereunder, and of all other laws and regulations, relating to (type of entry) entry No. ____________, of ____________ (date) will be observed and complied with in all respects. (Signature)
[T.D. 73-175, 38 FR 17447, July 2, 1973, as amended by T.D. 78-329, 43 FR 43455, Sept. 26, 1978; T.D. 84-213, 49 FR 41184, Oct. 19, 1984; T.D. 89-65, 54 FR 28414, July 6, 1989; T.D. 92-31, 57 FR 10989, Apr. 1, 1992; CBP Dec. 08-25, 73 FR 40727, July 16, 2008]