; (2) gyroscopes; (3) guidance computers; (4) specialized mechanical and retaining assemblies; (5) test equipment; and (6) such other components to ensure the guidance system will be maintained and modernized over the life of the Sentinel. 1643. Integrated master schedule for the Sentinel missile program of the Air Force (a) Documentation required Not later than 30 days after the date of the enactment of this Act, the Under Secretary of Defense for Acquisition and Sustainment, acting through the Assistant Secretary of the Air Force for Acquisition, Technology, and Logistics, shall submit to the congressional defense committees an approved integrated master schedule for the Sentinel missile program of the Air Force. (b) Additional requirements The Under Secretary of Defense for Acquisition and Sustainment shall ensure that the integrated master schedule submitted under subsection (a)— (1) is consistent with the scheduling best practices set forth in the publication of the Government Accountability Office titled Schedule Assessment Guide: Best Practices for Project Schedules (GAO–16–89G), dated December 2015 (or any successor to such guide); (2) addresses the full scope of work required under the sentinel missile program