22 U.S.C. § 287d–1 — Noncombatant assistance to United Nations

(a) Armed forces details; supplies and equipment; obligation of funds. If the UN requests cooperative action, and the President finds it's consistent with the national interest to comply, the President may authorize the following — in support of UN activities aimed specifically at peacefully settling disputes, not the armed-forces activities under Chapter VII of the UN Charter: (1) Detailing U.S. armed-forces personnel to the UN, on terms the President sets, to serve as observers, guards, or in any non-combat role — capped at 1,000 such personnel at any one time. While detailed, they're treated for all purposes as on regular duty, keeping their pay, allowances, longevity credit, retirement credit, and other perquisites; and if the President authorizes or approves it, they may also accept directly from the UN any of those allowances or perquisites, plus extraordinary expenses and perquisites tied to the detail. (2) Letting the Department of Defense furnish the UN facilities, services, or other assistance, and lend the U.S.'s fair share of supplies and equipment, on terms the President sets. (3) Obligating whatever funds appropriated to the Defense Department (or any department within it) are needed to carry out (1) and (2), including procuring the personnel, supplies, equipment, facilities, services, or other assistance the UN requested, and replacing items drawn from existing stock. (b) Reimbursement from the United Nations; waiver. Whenever personnel or assistance is provided under subsection (a)(1) or (2), the President must require the UN to reimburse the U.S. for the expense — except that in exceptional circumstances, or when the President finds it's in the national interest, the President may waive some or all of that reimbursement requirement. When reimbursement is made, it's credited, at the Defense Department's option, either to the account that incurred the expense or to another current account for the same purposes. (c) Additional appropriation authorizations. Besides the funding already authorized to the State Department under section 287e, Congress also authorized appropriating to the Defense Department (or any department in it) whatever sums are needed to reimburse it if reimbursement from the UN is waived, in whole or part, under subsection (b). (d) Disclosure of information. Nothing in this subchapter authorizes disclosing information or knowledge whose disclosure is banned by any other U.S. law.