M40 Field Protective Mask

The M40 Field Protective Mask is one of various gas masks used by the military of the United States and its allies to protect from field concentrations of chemical and biological agents, along with radiological fallout particles. It is not effective in an oxygen deficient environment or against ammonia.

Read more about M40 Field Protective Mask:  Characteristics, History

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M40 Field Protective Mask - History
... The M40 was the result of a program in the 1980s to develop a successor to the M17-series protective masks which had been in service with the US armed ... The M40 was to be a return to conventional gas mask design with an external side-mounted filter canister, rather than the internal cheek filters of the M17, which were awkward to change, especially ... The final prototype, the XM40, was approved for service and then designated the M40 ...

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