Members of the 28th Civil Engineer Squadron fire department rang the fire department bell at the 9/11 memorial ceremony outside of the 28th Bomb Wing headquarters at Ellsworth Air Force Base, S.D., Sept. 11, 2018. The bell was struck in three intervals of five rings, as firefighter tradition, in honor of the 343 firefighters that died on Sept. 11, 2001. (U.S. Air Force photo by Airman Christina Bennett)