For example, the M2-10-6 may not be the real designation of the older rarer facepiece as the -10- part in the mask means it has an M10 service canister. However, the designation would depend on the canister on said mask. Since The M2 optical was a lightweight service based mask it used a M10/M10A1 service canister. However, the earlier M2-10-6 is very rare. The M2-10A1-6 is relatively uncommon today but when found in original packaging is quite rare. The Kit of the M2 optical consisted of: The mask, Anti Dim Cloth, C3 waterproofing kit, 2 Cover Protective Individuals, M5/M5A1 ointment kit, and a M6 lightweight service mask carrier. The Later M2-10A1-6 had an Updated C11 Diaphragm Angle tube assembly utilizing the updated C15 exhale valve. (A Soviet copy) The mask was also equipped with a standard 686 mm (18-inch) M3 hose, M10A1 Service Canister, as well as a 6 point M7/M7A1 (depending on model) head harness. The face piece had side running tissot deflectors similar to the ShMS. The M2-10-6 face pieces were made of a neoprene rubber due to the lack of natural rubbers during the war, though they still continued to procure all examples out of neoprene post war. The assembly consisted of an Older M8 exhale valve and plastic Diaphragm Cover. The M2-10-6 was almost identical to the post war M2-10A1-6 but utilized an older Diaphragm Angle Tube Assembly Found on the M3A1 Diaphragm. In around the mid-1940s the United States Military replaced the M1 optical series with the M2-10-6 as the M1s were too bulky so they used a design derived from the current M3-10A1-6 lightweight service mask. This Optical Design is no longer used today with the growing use of all-purpose masks. The M1 optical series then saw use in the Navy as the Navy Diaphragm Optical (NDO). The brow of the lens existed because it was adjustable for optics on certain ranging devices. The M1 optical was very similar to the Navy Diaphragm Series the only difference being the canister being rimmed on the M1, and the M1 having optical lenses, which had a poor field of vision but did the job of fitting with optics. Most in trial failed but one design saw use the M1 Army Optical series. In the late 1930s and early 1940s, the United States Military saw a need for optical respirators.
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