A B-52H Stratofortress assigned to the 20th Bomb Squadron, Barksdale Air Force Base, La., soars over Nevada during a Red Flag exercise at Nellis Air Force Base, Nev., Jan. 31, 2013. The B-52 was America's first long-range, swept-wing heavy bomber. Now entering its sixth decade of service, it continues to be an integral element of the Air Force bomber fleet. (U.S. Air Force photo/Staff Sgt. Vernon Young Jr.)