Staff Sgt. Chelsea Mays disconnects a fuel hose as part of preflight preparations for a 64th Aggressor Squadron F-16 Fighting Falcon Aug. 13, 2013, at Nellis Air Force Base, Nev. It is the crew chief's responsibility to ensure the aircraft is properly refueled before each training mission. Mays is a F-16 crew chief assigned to the 926th Aircraft Maintenance Squadron. (U.S. Air Force photo/Airman 1st Class Joshua Kleinholz)

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Photo by: Airman 1st Class Joshua Kleinholz |  VIRIN: 130813-F-MF020-018.JPG