; or (2) to impair or otherwise affect the activities performed by that agency as granted by law. 1263. Extension and modification of authority to provide assistance to counter the Islamic State of Iraq and Syria (a) In general Subsection (a) of section 1236 of the Carl Levin and Howard P. Buck McKeon National Defense Authorization Act for Fiscal Year 2015 ( Public Law 113–291 ; 128 Stat. 3559) is amended, in the matter preceding paragraph (1)— (1) by striking $4,000,000 and inserting $6,000,000 ; and (2) by striking December 31, 2023 and inserting December 31, 2024 . (b) Funding Subsection (g) of such section is amended by striking Overseas Contingency Operations for fiscal year 2023, there are authorized to be appropriated $358,000,000 and inserting fiscal year 2024, there is authorized to be appropriated $241,950,000 . (c) Limitation on cost of construction, repair, and renovation projects Subsection (o) of such section is amended— (1) in paragraph (1)— (A) by striking (1) In general .—The President and inserting (1) Authority of President .—The President ; and (B) by striking paragraph (2) and inserting paragraph (3) ; (2) by redesignating paragraphs (2), (3), (4), and (5) as paragraphs (3), (4), (5), and (6), respectively; (3) by inserting after paragraph (1) (as so amended) the following: (2) Authority of Secretary of Defense (A) In general The Secretary of Defense may further adjust the total cost of a project subsequent to a waiver by the President of the dollar amount limitation in subsection (a) if— (i) such total cost does not exceed the sum of— (I) the cost estimate for the project as required by paragraph (4)(B)(i) that is included in the notification submitted by the President pursuant to such waiver; and (II) the amount that is 50 percent of such cost estimate