; (4) submit to the National Nuclear Security Administration a formal request, through the Nuclear Weapons Council, for participation in and support for the W80–4 ALT warhead project; and (5) designate the Department of the Navy as the military department to lead the W80–4 ALT nuclear weapon program for the Department of Defense. (b) Initial operational capability The Secretary of Defense and the Administrator for Nuclear Security shall take such actions as necessary to ensure the program described in subsection (a) achieves initial operational capability, as defined jointly by the Secretary of the Navy and the Commander of United States Strategic Command, by not later than fiscal year 2035. (c) Limitation The Under Secretary of Defense for Acquisition and Sustainment may not approve a Full Rate Production Decision or authorize Full Scale Production (as those terms are defined in the memorandum of the Nuclear Weapons Council entitled Procedural Guidelines for the Phase 6.X Process and dated April 19, 2000), for the W80–4 ALT program. (d) Briefing (1) In general Beginning not later than November 1, 2023, and on March 1 and September 1 of each year thereafter, the Under Secretary of Defense for Acquisition and Sustainment, in coordination with the Secretary of the Navy, the Administrator for Nuclear Security, and the Commander of the United States Strategic Command, shall jointly brief the congressional defense committees on the progress of the program described in subsection (a). (2) Contents Each briefing required under paragraph (1) shall include— (A) a description of significant achievements of the program described in subsection (a) completed during the period specified in paragraph (3) and any planned objectives that were not achieved during such period; (B) for the 180-day period following the briefing— (i) planned objectives for the programs; and (ii) anticipated spending plans for the programs; (C) a description of any notable technical hurdles that could impede timely completion of the programs