Airman 1st Class Amanda Edwards, 931st Civil Engineer Squadron emergency management apprentice, instructs Chemical, Biological, Radiological and Nuclear Survival Skills Training students on the proper wear of the M50 gas mask Oct. 3, 2017, at McConnell Air Force Base, Kansas. Students check the serviceability of their mask by ensuring a proper seal is accomplished.

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: 22d, arw, cbrn, chemical, gas, mask, sst, training