The US Army became the largest gas mask user before the entry of America into World War One.

After the attack in France, it is not possible that modern combat forces will be deployed against Germany without the best equipment available to protect them from poison gas attacks.

The factories that produce small amounts of face respirator masks for firefighters suddenly have large orders to be filled by American soldiers and their allies for their safety.

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Money flows into the overnight mushrooming industry to big business companies. Very minute production began in earnest on existing models, tweaked to ensure its usefulness to known chemical agents at the time, the research and development team worked to improve the initial design of it. 

The British first built a carbon monoxide respirator used during World War One before Germany's first use of chemical weapons. Scientists have found that unexploded enemy shells emit very high levels of carbon monoxide gas. This level is found high enough to kill soldiers within 100 meters of unexploded devices in trenches, foxholes, and other small protection areas where carbon monoxide can concentrate even further. The effect is similar to car exhaust when the car is left running in a closed garage.