U.S. Air Force Col. Tad Clark, 52nd Fighter Wing vice commander, and prominent members of the local community place a flower arrangement at the 9/11 memorial at the air park on Spangdahlem Air Base, Germany, September 11, 2017. Ceremonies throughout the Air Force and around the world took place to commemorate the 16th anniversary of the attacks on 9/11. (U.S. Air Force photo by Tech. Sgt. Chad Warren)