U.S. Air Force Lt. Col. Tim Hines, from the 10th Flight Test Squadron at Tinker AFB, Okla., prepares for the engine start of a B-52H Stratofortress on Feb. 12, 2015, Davis-Monthan Air Force Base, Ariz. The B-52 was decommissioned in 2008 and has spent the last seven years in 1000-type storage in the "Boneyard,” but is being restored and will eventually join the active B-52 fleet. (U.S. Air Force photo by Master Sgt. Greg Steele/Released)