U.S. Air Force Senior Airman Zachary Slater, 81st

U.S. Air Force Senior Airman Zachary Slater, 81st Infrastructure Division firefighter, rings a tribute bell as Chief Aviation Electronics Technician (Select) Adrian Pineiro, The Center for Naval Aviation Technical Training Unit student, stands by during a 9/11 ceremony in front of the 81st Training Wing headquarters building at Keesler Air Force Base, Mississippi, Sept. 11, 2018. Seventeen years ago on Sept. 11, 2001, 19 terrorists simultaneously hijacked four passenger jets; flying one into the Pentagon and two into the World Trade Center in New York City, New York, and one crashing outside of Shanksville, Pennsylvania. A total of 2,996 people were killed in the attacks. (U.S. Air Force photo by Kemberly Groue)