U.S. Air Force Staff Sgt. Matthew Cocran, 2nd Aircraft Maintenance Squadron crew chief, communicates with the aircrew aboard a B-52H Stratofortress before a taxi test on Feb. 12, 2015, Davis-Monthan Air Force Base, Ariz. The aircraft, known as the "Ghost Rider,” will undergo the taxi test to ensure the aircraft can be safely controlled down the runway before its flight to Barksdale Air Force Base, La, on Feb. 13. (U.S. Air Force photo by Master Sgt. Greg Steele/Released)