Senior foreign and U.S. attachés stand in silence during a wreath laying ceremony at the Mount Rushmore National Memorial, S.D., Sept. 11, 2016. The ceremony, administered in silence, was conducted in honor of the 15th anniversary of the attacks on Sept. 11, 2001, that occurred in New York, Virginia and Pennsylvania. (U.S. Air Force photo by Senior Airman Anania Tekurio)