Airmen assigned to the 317th Aircraft Maintenance Squadron rest in a simulated bunker on the flightline as they wait for perimeter sweeps to finish during an exercise at Dyess Air Force Base, Texas, Nov. 18, 2020. The Chemical Fury exercise was the 317th Airlift Wing’s first full-scale ATSO, or Ability to Survive and Operate, exercise since it was named a wing in 2017. (U.S. Air Force photo by Senior Airman Mercedes Porter)