![]() Early production of the M3 saw problems with the canister assembly, the crimping of the eye-rings to the facepiece, and problems producing the M6 carrier which was the main bottleneck of the lightweight service mask. The requirement for the M3 Lightweight Service mask was established as early as January of 1942 but wasn't finalized or standardized until later that year. The M3 Lightweight service mask had a shorter 457 mm (18-inch) long M3 hose, addition of an oronasal cup to reduce lens fogging, the lighter weight M10 or M10A1 canister, a smaller M6 carrier, and the facepiece itself had the head harness tab position changed to be farther back on the facepiece which negated the need for a rifle skid. The M2 series service mask had a longer 686 mm (27-inch) hose, no oronasal cup, used the MIXA1 canister, used the MIVA1 Carrier, and had a rifle skid on the lower head harness of the facepiece which was positioned mid-cheek of the facepiece. Over 8 million of the M2 series masks were produced during World War II, becoming obsolete in 1949.The United States M3 Lightweight Service Mask was a needed upgrade for the US military after it was found that the weight and bulk of the older M2 series service masks were unsatisfactory. That problem, and its heavy canister, led to the development of the M3 series and M4 series Lightweight Service Gas Masks during 1942. The M2 series masks lacked an internal nose cup and were more prone to fogging than their successors. A waist strap kept the bag close to the body. In use, the mask was removed from the bag while the canister remained in the bag, connected by the hose. The MIVAI (M4A1) carrying bag was used with a wide right-shoulder strap, carried at waist position on the left side. The next design, the M3 Lightweight Gas Mask, made substantial improvements over the M2 series. The M2 mask was very successful in providing protection for the soldier, but weighed about 5 pounds and was too bulky and inconvenient to use. M1VA1 Gas Mask Bag, used for the M1 and M2 series masks and others, sometimes with additional markings to designate which mask is enclosed. ![]() The M2A2 and M2A3 had a round outlet valve with concentric circle grillwork. The M2A1 outlet valve was flat, egg-shaped with no grill. Improvements to the outlet valve resulted in the M2A2 in 1942 and the M2A3 in 1944. The M2 Service Gas Mask was produced in three sizes: small, universal, and large. The M2A1 Service Mask used the facepiece of the training mask but replaced the training canister with the corrugated tube and M1XA1 filter canister arrangement from the M1A2 Service Mask. The M1 Training Mask was carried in a deep-pocket shoulder bag with a snap opening at top and a waist string attached to D-rings. The M1 Training Mask was standardized as the M2A1 Service Gas Mask in 1941.Īs the MI Training it used a cylindrical canister attached directly to the facepiece at the inlet valve, projecting downward to the wearer's chest. In 1939, the US Army developed the lightweight M1 Training Mask with a fully molded rubber facepiece, the first mai service respirator to eliminate stockinet cloth coverings. The M2 was developed and used during the second world war, from 1941, to 1949. ![]() The M2 mask was used by the US Army, replacing the M1.
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