Airmen of the 106th Rescue Wing assigned to the New York Air National Guard inspecting the filters of their gas masks at Francis S. Gabreski Air National Guard Base, , Feb. 3, 2018. A moisture sensor on the filer will change color to indicate if the filter should be replaced. ( Air National Guard

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Size: 1673px × 1195px
Photo credit: © PR Archive / Alamy / Afripics
License: Licensed
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