Provided, That such amount 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. SECURITY, ENFORCEMENT, AND INVESTIGATIONS U.S. Customs and border protection OPERATIONS AND SUPPORT (INCLUDING TRANSFER OF FUNDS) For an additional amount for U.S. Customs and Border Protection—Operations and Support , $4,001,239,000, to remain available until September 30, 2026: Provided, That of the total amount provided under this heading in this Act, $2,091,363,000 shall be for operational requirements relating to migration surges along the southwest border, counter-fentanyl activities, necessary expenses at ports of entry, reimbursement to the Department of Defense for border operations support, and other related expenses