U.S. Air Force Master Sgt. Jeffrey Koenig, right, president of Chapter 358, Air Force Sergeants Association, helps Airmen with the Langley Air Force Base Honor Guard raise the POW/MIA flag over the POW/MIA Memorial after a 24-hour run at Langley Air Force Base, Va., Sept. 20, 2013. Volunteer runners kept the flag in constant motion in honor of National POW/MIA Recognition Day.