Staff Sgt. Steven Concepcion, 455th Expeditionary Aircraft Maintenance Squadron crew chief, deployed from Hill Air Force Base, Utah, looks on as an F-16 Fighting Falcon starts up during a hydraulic leak repair at Bagram Airfield, Afghanistan, Nov. 30, 2015. The squadron provides combat-ready aircraft to the air component commander in support of coalition forces throughout Afghanistan. (U.S. Air Force Photo by Tech. Sgt. Robert Cloys/Released)