Airmen don their gas masks during a chemical, biological, radiological or nuclear attack training exercise at Davis-Monthan Air Force Base, Ariz., Feb. 11, 2018. The CBRN exercise tested the readiness of Airmen in a simulated deployed location. ( Air Force photo by Senior Airman Cheyenne A. Powers)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: -, air, base, cbrn, davis-monthan, exercise, force, gear, mopp, readiness