Staff Sgt. Nathan Gilbert, 141st Maintenance Squadron metals technician, participates in a respirator mask fit test Dec. 7, 2016 at Fairchild Air Force Base, Washington. Gilbert completed the respirator fit test as part of requirements for accomplishing his duties as a metals technician. ( Air Force photo/Senior Airman Nick J. Daniello)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: airmen, bioenvironmental, biological, chemical, fairchild, fit, gas, mask, readiness, test