U.S. Air Force Airmen run during the POW/MIA 24-hour vigil at Langley Air Force Base, Va., Sept. 19, 2013. Airmen were able to walk or run a portion of the full 7.4 mile path through Langley AFB. The run ended at 10 a.m. Sept. 20 at the Langley POW/MIA memorial. (U.S. Air Force photo by Staff Sgt. Stephanie Rubi/Released)