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 forces from the 1960s. 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 in a contaminated environment. The final prototype, the XM40, was approved for service and then designated the M40.
The M40 was phased into service with the US Army in the mid-1990s, with another new design, the MCU-2/P similarly replacing older masks in service with the Air Force. However, both masks suffered from the inadequate protective capabilities of their facepiece, which was of a silicone rubber susceptible to corrosion from blister agents. Thus, the masks were effectively ill-suited for protecting against much more than riot control agents, and a butyl rubber 'Second Skin' had to be quickly issued for fitting over and reinforcing the M40 facepiece to make it effective in its intended role.
The M42 series masks are a variant of this mask with alterations that make it better suited for use by armored vehicle crews, who have to connect their masks to and draw air from their vehicle's own filtration system.
The M40 field protective mask, along with the older M17 mask, are currently being replaced by the M50 Joint Service General Purpose Mask.
Read more about this topic: M40 Field Protective Mask
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