Icemen from the 354th Communications Squadron carry a POW/MIA flag during a 24-hour Memorial Run Sept. 20, 2013, Eielson Air Force Base, Alaska. The flag was in constant motion, being passed from one group of runners to another, in a run dedicated to American prisoners of war and those missing in action. (USAF Airman 1st Class Peter Reft)Since World War II to present day, over 83,000 Americans have been unaccounted for,according to Defense Prisoner of War/Missing Personnel Office.