U.S. Air Force Staff Sgt Hunter Kline, 379th Expeditionary Civil Engineering Squadron fire protection chief (right), dons a protective gas mask before participating in a confined space exercise at Al Udeid Air Base, Qatar, Nov. 19, 2021. Airmen who work in underground confined spaces wear respiratory equipment for their safety. (U.S. Air Force Photo by Senior Airman Jacob Dastas)
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