Col. Michele Edmondson, 81st Training Wing commander, delivers remarks during a 9/11 memorial ceremony, Sept. 12, 2016, on Keesler Air Force Base, Miss. Fifteen years ago on Sept. 11, 2001, 19 terrorists simultaneously hijacked four passenger jets; flying one into the Pentagon in Washington, D.C., two into the World Trade Center in New York City, New York and one crashing outside of Shanksville, Pa. A total of 2,996 people were killed in the attacks.  (U.S. Air Force photo by Kemberly Groue/Released)