An F-16 Fighting Falcon belonging to the 4th Expeditionary Fighting Squadron takes off from Bagram Airfield, Afghanistan, March 9, 2011. More recently, F-16s from the 555th EFS contributed to the success of Operation Hammer Down II, which took place along the Afghanistan-Pakistan border June 25-30, 2011. (U.S. Air Force photo/Capt. Erick Saks)