Intercontinental ballistic missile
Vandenberg Space Force Base Launch Facility 21 (LF-21) is a former US Air Force Intercontinental ballistic missile launch facility on Vandenberg SFB, California, USA. It was a launch site for the land-based Minuteman missile series. In the 2000s the silo was remodeled into a launch site for an Interceptor for the Ground-Based Midcourse Defense System.