Provided further, That of the amounts made available under this heading, $798,762,000 is designated by the Congress as being for an emergency requirement pursuant to section 251(b)(2)(A)(i) of the Balanced Budget and Emergency Deficit Control Act of 1985. 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, $1,152,529,000, of which $1,082,875,000 shall remain available until September 30, 2026, and of which $69,654,000 shall remain available until September 30, 2028: Provided, That the amounts made available under this heading are designated by the Congress as being for an emergency requirement pursuant to section 251(b)(2)(A)(i) of the Balanced Budget and Emergency Deficit Control Act of 1985. 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