The Portacount, a protection assessment test instrument, is used to test the durability of the gas mask. The Portacount measures how much air is shielded from the mask to ensure no outside elements get into the mask. ( Air Force photo by Tech. Sgt. Terrica Y. Jones)

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Photo credit: © PJF Military Collection / Alamy / Afripics
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Keywords: 916th, afb, air, arw, exercise, force, johnson, refueling, seymour, wing