U.S. Air Force Chief Master Sgt. Roger Towberman, left, 480th Intelligence, Surveillance and Reconnaissance Wing command chief, and Chief Master Sgt. Emmette E. Bush Jr., 1st Fighter Wing command chief, run during the POW/MIA 24-hour vigil at Langley Air Force Base, Va., Sept. 19, 2013. Directly after the run, the Recognition Ceremony was held at the Langley POW/MIA memorial. (U.S. Air Force photo by Staff Sgt. Stephanie Rubi/Released)