Senior Airman Justeen Swihart, 97th Medical Group bio environmental engineering technician, tightens gas mask on Airman 1st Class Don Nathaniel Wentzel, 97th Medical Group bio environmental engineering tech at the Bio Environmental office Jan. 10, 2011. Quantitative fit tests ensure issued gas masks are properly fit to users increasing personal protection during a chemical, biological, radiological or nuclear attack.

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Photo credit: © PJF Military Collection / Alamy / Afripics
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Keywords: air, airforce, altus, base, force, military, states, united, usa