U.S. Air Force B-2 Spirit pilots assigned to the 509th Bomb Wing run to their aircraft during a response to aircraft alert during Global Thunder 17, at Whiteman Air Force Base, Mo., Oct. 27, 2016. Global Thunder is an annual command and control exercise designed to train U.S. Strategic Command forces and assess joint operational readiness. (U.S. Air Force photo by Tech. Sgt. Andy Kin)