Master Sgt. Brian Fahey performs preflight checks on a KC-10 Extender prior to flight June 14, 2013, in Southwest Asia. Fahey manages all systems on the aircraft, ranging from hydraulics to electrical systems throughout the flight. Fahey is a flight engineer assigned to the 908th Expeditionary Air Refueling Squadron. (U.S. Air Force photo/Staff Sgt. Joshua J. Garcia)