U.S. Air Force first responders from 60th Security Forces Squadron and the 60th Civil Engineer Squadron render a salute during a 9/11 Memorial Retreat Ceremony Sept. 11, 2019, at Travis Air Force Base, California. The ceremony honored the victims of the terrorist attacks on Sept. 11, 2001 and the first responders who risked their lives to save them. (U.S. Air Force photo by Heide Couch)