A Japanese Air Self-Defense Force member buckles on an oxygen tank before running 110 flights of stairs with his team at Yokota Air Base, Japan, Sept. 11, 2020, for a 9/11 Memorial Run. During the run, teams of four relayed to run 110 floors together; individuals also competed separately, running all 110 floors themselves in honor of the men and women lost while responding to the terror attacks on 9/11. (U.S. Air Force photo by Staff Sgt. Kyle Johnson)