M40, Gas Mask and Respirator Wiki
The M40 series Field Protective Masks were used by the US Army, US Marine Corps, and selectively by the US Navy. . The masks were developed and introduced as a replacement to the M17 series protective mask that had been in service since 1959. The M17 introduced a number of innovative features absent on the previous service masks, such as a voice diaphragm and a drinking system. However, the M17 series had a number of shortcomings: The M17 series M13 filters were difficult and time-consuming to c
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