An F-16 Fighting Falcon assigned to the 77th Expeditionary Fighter Squadron, Bagram Airfield, Afghanistan prepares to be refueled by a KC-135 Stratotanker from the 340th Expeditionary Air Refueling Squadron Det 1 over the skies of Afghanistan. F-16s are used to provide vital air support to Afghan and coalition forces on the ground.(U.S. Air Force photo by Staff Sgt. Sean Martin) (Released)(U.S. Air Force photo by Staff Sgt. Sean Martin)