U.S. Air Force Staff Sgt. Kassandra Hershberger, 374th Communications Squadron unit security manager, looks up the stairs of a tower at Yokota Air Base, Japan, Sept. 11, 2020, as she prepares to switch with the current runner during a 9/11 Memorial Run. Hershberger and her team competed in the 9/11 Memorial Tower Run where teams of four relayed to run 110 floors together, simulating the floors first responders would have had to climb after the attacks. (U.S. Air Force photo by Staff Sgt. Kyle Johnson)