U.S. Air Force Airman 1st Class Curvin Snyder, 18th Civil Engineer Squadron firefighter, takes off his personal protective equipment after participating in a 9/11 Memorial Stair Climb at Kadena Air Base, Japan, Sept. 11, 2021. Made of many layers of heat-resistant fabric, the bulky pants and jacket worn by firefighters help protect them from the many dangerous conditions they may encounter on the job. (U.S. Air Force photo by Airman 1st Class Anna Nolte)