![]() 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. ![]() However, both masks suffered from the inadequate protective capabilities of their face pieces, which was of a silicone rubber susceptible to corrosion from blister agents. Army and Marine Corps in the mid-1990s, with another new design, the MCU-2/P also replacing the older M17 in service with the U.S. The M40 was phased into service with the U.S. The final prototype, the XM40, was approved for service and then designated the M40. The M40 was to be a return to conventional protective 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 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 since 1959. History US Navy Seabees jog during an exercise with M40s worn. It is not effective in an oxygen deficient environment or against ammonia. The M40 field protective mask was one of various protective masks used by the United States Armed Forces and its allies to protect from field concentrations of chemical and biological agents, along with radiological fallout particles. A soldier from the 70th Brigade Support Battalion, 210th Fires Brigade, 2nd Infantry Division wears the M40 during an NBC exercise in South Korea.ġ992–Present (U.S.
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