10 U.S.C. § 277 — Reimbursement

(a) Subject to subsection (c), and to the extent required by section 1535 of title 31 (the "Economy Act") or other applicable law, the Secretary of Defense must require a civilian law enforcement agency that receives support under this chapter to reimburse the Department of Defense for that support. (b) (1) Subject to subsection (c), the Secretary of Defense must require a federal agency that receives law enforcement support, or support for a national special security event, from National Guard personnel on duty under section 502(f) of title 32, to reimburse the Department of Defense for the costs — no matter what any other law says. No other part of this chapter applies to that support. (2) Any funds the Department receives as reimbursement for National Guard support can be credited, at the Secretary of Defense's choice, to (A) the account used to fund the support, or (B) the account currently available for reimbursement purposes. (c) An agency receiving support under this chapter or under section 502(f) of title 32 does not have to reimburse the Department if the Secretary of Defense waives the reimbursement requirement. The Secretary may waive it if the support (1) is provided in the normal course of military training or operations, or (2) benefits the Defense Department unit or National Guard personnel providing it about as much as they would have gained from regular military operations or training.