251(b)(2)(A). Procurement, Defense-Wide For an additional amount for Procurement, Defense-Wide, $4,000,000,000, to remain available until September 30, 2027, for the Secretary of Defense to provide to the Government of Israel for the procurement of the Iron Dome and David’s Sling defense systems to counter shortrange rocket threats: Provided , That such funds shall be transferred pursuant to an exchange of letters and are in addition to funds provided pursuant to the U.S.-Israel Iron Dome Procurement Agreement, as amended: Provided further , That nothing under this heading shall be construed to apply to amounts made available in prior appropriations Acts for the procurement of the Iron Dome and David's Sling defense systems: Provided further , That such amount is designated by the Congress as being for an emergency requirement pursuant to section 251(b)(2)(A) of the Balanced Budget and Emergency Deficit Control Act of 1985, as amended: Provided further , That such amounts shall be available only if the President designates such amount as an emergency requirement pursuant to section 251(b)(2)(A). Military Programs Research, Development, Test, and Evaluation Research, Development, Test and Evaluation, Defense-Wide For an additional amount for Research, Development, Test and Evaluation, Defense-Wide , $1,200,000,000, to remain available until September 30, 2026, for the Secretary of Defense to provide to the Government of Israel for the development of the Iron Beam defense system to counter short-range rocket threats: Provided , That such funds shall be transferred pursuant to an exchange of letters: Provided further , That nothing in the preceding proviso shall be construed to apply to amounts made available in prior appropriations Acts for the development of the Iron Beam defense system: Provided further , That such amount is designated by the Congress as being for an emergency requirement pursuant to section 251(b)(2)(A) of the Balanced Budget and Emergency Deficit Control Act of 1985, as amended: Provided