Director assumes control of Sentinel Systems Directorate U.S. Air Force Logo Aug. 12, 2022 Assumption of responsibility ceremony Maj. Gen. John Newberry (left), commander of the Air Force Nuclear Weapons Center, hands the directorate flag to Col. Charles Clegg, incoming director of the Sentinel Systems Directorate, during an assumption of responsibility ceremony July 27, 2022, at Hill Air Force Base, Utah. The directorate is responsible for the total life cycle of the new LGM-35A Sentinel intercontinental ballistic missile (ICBM), which will replace the LGM-30 Minuteman III ICBM. (U.S. Air Force photo by Todd Cromar) Details Download