U.S. Army Gen. John. F. Campbell, left, commander of Resolute Support Mission U.S. Forces Afghanistan and U.S. Army Command Sgt. Maj. Delbert Byers share a moment of silence observing the anniversary of the 9/11 attacks during a wreath-laying ceremony in Kabul, Afghanistan, Sept. 11, 2015. U.S. Air Force photo by Tech. Sgt. Robert Sizelove