The 'trail' Ground-based Interceptor (GBI) launches from Vandenberg Air Force Base, California, March 25, in the first-ever salvo engagement test of a threat-representative Intercontinental Ballistic Missile target. The AEDC 10-foot vacuum chamber at Arnold Air Force Base provided mission simulation capability for interceptor and its kill vehicle sensors. The chamber is able to characterize sensor performance in a space environment against simulated operational scenarios. (Courtesy photo/Missile Defense Agency)