Soldiers of the 40th Division undergo gas mask testing to ensure preparedness for any potential gas attacks. This photograph, taken in March 1918 at Camp Kearny in San Diego, California, captures their dedication to practicing with their protective gear so that they can react efficiently to the "gas" signal. This image was censored and released by the War College division.

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Size: 7983px × 6305px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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