A portion of a steel beam collected from the wreckage of ground zero is displayed at the 9/11 memorial ceremony outside of the 28th Bomb Wing headquarters at Ellsworth Air Force Base, S.D., Sept. 11, 2018. The memorial ceremony was organized by the 28th Civil Engineer Squadron fire department in honor of the nearly 3,000 people that died on Sept. 11, 2001. (U.S. Air Force photo by Airman Christina Bennett)