#Gas mask filter adapter series
The field of view of the M40 series and other masks were deemed inadequate for sustained operations and the mask's ability to interface with current sighting and other optical devices was poor.
When the mask is worn, the filter element stuck out of the face blank of the mask and became a natural "lever arm" that could break the seal of the mask when working in confined spaces or simply through the rigor of combat operations. The M40 mask carrier earned the derogatory nickname, "the suitcase" due to the large size and cumbersome handling in the field. The decision to move to the large external C2 and C2A1 filter elements for the sake of NATO standardization made the mask bulkier (although lighter) than its predecessor, the M17. Reports from the field indicated that the M40 series mask was described as too bulky and heavy for modern military operations. The program managers gathered information from all viewpoints, to include: In the mid-1990s, the M40 series masks were replacing the old M17 series throughout the armed forces of the United States but CBDCOM (later SBCCOM) was already looking forward to the next mask series. Foreign military sales versions of the mask are also available with similar or identical specifications. Other variants were developed based on the M50 design for specific needs of certain military populations such as the M53 for the Special Operations Forces (SOF) community. There are two mask variants: the M50 (ground and shipboard use) and M51 (ground vehicle use).
The M50/51 masks replaced the M40 and M42, MCU-2/P series of masks, and the M45 in the Land Warrior Program. It is an above-the-neck, chemical-biological (CB) respirator that protects against battlefield concentrations of CB agents, toxins, toxic industrial materials, and radioactive particulate matter.
The mask was designed to incorporate state-of-the-art technologies to protect US and allied forces from current and anticipated CBRN threats. The M50 and M51, officially the Joint Service General Protective Mask ( JSGPM) is a lightweight, protective mask system consisting of the mask, a mask carrier, and additional accessories.
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