Maj. Rolf Holmquist, 99th Air Base Wing deputy chaplain, inspects a gas mask during a chemical, biological, radiological and nuclear defense survival skills training course on Nellis Air Force Base, Nev., April 30, 2015. A gas mask inspection should be performed every six months when not in a combat zone or every seven days while in a combat zone. Airman 1st Class Mikaley Towle)

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Photo credit: © PJF Military Collection / Alamy / Afripics
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Keywords: air, airforce, airman, cbrn, force, military, nellis, states, training, united, usa