USAF Sentinel Program Advances Design and Testing Amid Restructuring Ahead of Key Milestone Decision
The U.S. Air Force’s Sentinel program, a critical initiative to overhaul the nation's intercontinental ballistic missile (ICBM) infrastructure, is progressing with significant design maturation and testing despite an ongoing restructuring process. This restructuring began over two years ago following substantial cost growth, which led to a Nunn-McCurdy breach in 2024, with costs projected at $141 billion—an 81% increase over original estimates. Although the Pentagon recertified the program's necessity, the Milestone B decision was rescinded, necessitating a comprehensive restructuring plan. Air Force and Northrop Grumman leaders assert that this extended process has clarified the program's scope and importance. Key recent achievements include the first vertical stacking of an inert missile at Vandenberg SFB, California, demonstrating that critical subsystems are on track for initial flight tests in 2027. Additionally, a structural trial of the missile’s payload reentry system was completed in August, and t...