unless the Secretary of the Army determines that additional obligations are necessary for such purposes and notifies the Committees on Appropriations of both Houses of Congress of the determination and the reasons therefor. Military construction, navy and marine corps For acquisition, construction, installation, and equipment of temporary or permanent public works, naval installations, facilities, and real property for the Navy and Marine Corps as currently authorized by law, including personnel in the Naval Facilities Engineering Command and other personal services necessary for the purposes of this appropriation, $1,611,914,000, shall be used for the projects, and in the amounts specified under the heading Military Construction, Navy and Marine Corps in the report accompanying this Act, to remain available until September 30, 2025: Provided , That, of this amount, not to exceed $160,710,000 shall be available for study, planning, design, and architect and engineer services, as authorized by law, unless the Secretary of the Navy determines that additional obligations are necessary for such purposes and notifies the Committees on Appropriations of both Houses of Congress of the determination and the reasons therefor. Military construction, air force For acquisition, construction, installation, and equipment of temporary or permanent public works, military installations, facilities, and real property for the Air Force as currently authorized by law, $569,792,000, shall be used for the projects, and in the amounts specified under the heading Military Construction, Air Force in the report accompanying this Act, to remain available until September 30, 2025: Provided , That, of this amount, not to exceed $166,192,000 shall be available for study, planning, design, and architect and engineer services, as authorized by law, unless the Secretary of the Air Force determines that additional obligations are necessary for such purposes and notifies the Committees on Appropriations of both Houses of Congress of the