#10 U.S. Army soldiers wear gas masks during a chemical warfare training exercise in California. 1943.

#10 U.S. Army soldiers wear gas masks during a chemical warfare training exercise in California. 1943.

War dogs Wearing Canine Gas Masks during WWI and WWII

#10 U.S. Army soldiers wear gas masks during a chemical warfare training exercise in California. 1943.

WWII

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