; of which $500,000,000 shall be available until September 30, 2025; and of which such sums as become available in the Customs User Fee Account, except sums subject to section 13031(f)(3) of the Consolidated Omnibus Budget Reconciliation Act of 1985 ( 19 U.S.C. 58c(f)(3) ), shall be derived from that account: Provided, That not to exceed $34,425 shall be for official reception and representation expenses: Provided further, That not to exceed $150,000 shall be available for payment for rental space in connection with preclearance operations: Provided further, That not to exceed $2,000,000 shall be for awards of compensation to informants, to be accounted for solely under the certificate of the Secretary of Homeland Security: Provided further, That $650,000,000 shall be transferred to Federal Emergency Management Agency—Federal Assistance to support sheltering and related activities provided by non-Federal entities, in support of relieving overcrowding in short-term holding facilities of U.S. Customs and Border Protection, of which not to exceed $9,100,000 shall be for the administrative costs of the Federal Emergency Management Agency: Provided further, That not to exceed $2,500,000 may be transferred to the Bureau of Indian Affairs for the maintenance and repair of roads on Native American reservations used by the U.S. Border Patrol. PROCUREMENT, CONSTRUCTION, AND IMPROVEMENTS For necessary expenses of U.S. Customs and Border Protection for procurement, construction, and improvements, including procurement of marine vessels, aircraft, and unmanned aerial systems, $850,170,000, of which $758,056,000 shall remain available until September 30, 2026, and of which $92,114,000 shall remain available until September 30, 2028. U.S. immigration and customs enforcement OPERATIONS AND SUPPORT For necessary expenses of U.S. Immigration and Customs Enforcement for operations and support, including the purchase and lease of up to 3,790 (2,350 for replacement only) police-type vehicles; overseas vetted units