The United States Air Force and Northrop Grumman have begun prototyping a new launch silo tube for the Sentinel intercontinental ballistic missile program. The modular silo design is intended to accelerate deployment of 450 launch sites while improving maintainability and reducing long-term costs. ====================================== #LGM_35A_Sentinel #Northrop_Grumman #ICBM_launch_silo

Source: Northrop Grumman builds Sentinel ICBM launch silo