19 CFR 148.89: Property of public international organizations and foreign governments.

(a) Exemption from duty. Property of designated international organizations listed in paragraph (b) of § 148.87 or of foreign governments shall be admitted free of duty and internal-revenue taxes imposed upon or by reason of importation under 22 U.S.C. 288a(d), but such exemption shall be granted only upon the receipt in each instance of instruction from the United States Customs Service issued at the request of the Department of State.

(b) Bond. Any Customs bond which may be required from a designated international organization (see paragraph (b) of § 148.87) in connection with the importation or entry of merchandise into, or the exportation of merchandise from, the United States may be accepted without surety.