Airman 1st Class William Becker, 28th Aircraft Maintenance Squadron B-1 bomber crew chief, services the main gear strut on a B-1 during a routine inspection at Ellsworth Air Force Base, S.D., Sept. 10, 2013. Prior to flight, crew chiefs will inspect and perform various functional checks on the B-1 to ensure it has been properly serviced with fuel, hydraulic fluid and liquid oxygen. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)