Modern warfighters face various biological and chemical threats on the battlefield, from disease to potential manmade poisons, and they require more protective and innovative gear to keep them safe in the varied environments they encounter.
When you think of a CBRN protective mask, most people visualize one of the currently fielded masks, such as the M50 or M51, which is a large black mask with two filter canisters on each side of the mask (see image below for reference). These are the masks that most warfighters across the services are fielded for a protective ground mask.
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Source: DVIDS