A KC-135 Stratotanker prepares to refuel a B-52 Stratofortress in midair over the United States Oct. 30, 2016, as part of Exercise Global Thunder. Exercise Global Thunder provides training opportunities for USSTRATCOM components, task forces, units and command posts to deter and, if necessary, defeat a military attack against the United States and to employ forces as directed by the President.This tanker refueled two B-52s on this mission. (U.S. Air Force photo/Tech. Sgt. Travis Edwards)