; (2) addresses the full scope of work required under the sentinel missile program; and (3) fully integrates contractor and government activities. (c) Monthly briefings Not later than 180 days after the date of the enactment of this Act, and on a monthly basis thereafter until January 1, 2029, the Secretary of the Air Force shall provide to the congressional defense committees a briefing on the progress of the Sentinel missile program, which shall include an update on the progress of all subsystems and elements associated with achieving full operational capability of the weapons system. (d) Notification Not later than 30 days after the Secretary of the Air Force becomes aware of an event that is expected to delay, by more than one fiscal quarter, the date on which Sentinel missile achieves initial operational capability (as set forth in the integrated master schedule submitted under subsection (a)), the Secretary shall— (1) submit notice of such delay to the congressional defense committees; and (2) include with such notice— (A) an explanation of the factors causing such delay; and (B) a plan to prevent or minimize the duration of such delay. 1644. Operational timeline for Strategic Automated Command and Control System (a) In general The Secretary of the Air Force shall develop a replacement of the Strategic Automated Command and Control System (SACCS) by not later than the date on which the LGM–35A Sentinel intercontinental ballistic missile program reaches initial operational capability. (b) Replacement capabilities The replacement required by subsection (a) shall— (1) replace the SACCS base processors; (2) replace the SACCS processors at launch control centers; (3) provide internet protocol connectivity for wing-wide command centers of the LGM–35A Sentinel intercontinental ballistic missile program