Defense Secretary Ash Carter, center left, and Air Force Gen. Paul J. Selva, center right, vice chairman of the Joint Chiefs of Staff, observe honor guard members during a POW/MIA ceremony at the Pentagon, Sept. 16, 2016. National POW/MIA Recognition Day is observed on the third Friday in September and honors those who were prisoners of war and those who are still missing in action. DoD photo by Air Force Tech. Sgt. Brigitte N. Brantley