The Air Force and Northrop Grumman are discussing changes to the schedule for the Sentinel intercontinental ballistic missile to remedy the "many deficiencies" in the current master schedule, according to a Government Accountability Office report released Thursday. The program office is working with Northrop on a high-level review for the LGM-35A nuclear missile, according to GAO's Weapon Systems Annual Assessment , as the deficiencies have made the schedule ineffective at managing the program’s execution. The program office, in response to...