U.S. Air Force Airmen of the 97th Civil Engineer Squadron (CES) walk back from the chemical, biological, radiological and nuclear (CBRN) defense training area, May 26, 2021, at Altus Air Force Base, Oklahoma. CBRN training is one of the primary responsibilities of the 97th CES Emergency Management Flight. (U.S. Air Force photo by Tech. Sgt. Robert Sizelove)
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