Air Force’s new intercontinental ballistic missile system has a name: Sentinel
Secretary of the Air Force Frank Kendall approved the designation for the system that modernizes the ICBM leg of the Nation’s nuclear triad.
https://www.af.mil/News/Article-Display/Article/2990069/air-forces-new-intercontinental-ballistic-missile-system-has-a-name-sentinel/ DoD News