A division commander of Chemical Warfare Service tells assembled World War 1 trainee soldiers that, properly trained, they should be able to perform their duties, in simulated combat, for at least one hour, in full protective gas masks, without loss of efficiency. Soldiers seen training in field wearing gas masks. Officer in charge of gun crew is wearing new diaphragm microphones so that gun crew can hear while wearing their gas masks. He drills gun crew with commands.
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