Some early units were equipped with towed 37 mm guns, but this was quickly abandoned. In addition to the 75 mm-equipped M3 GMC, the original attempt to produce a tank destroyer, a vehicle was developed utilizing the common 37mm anti-tank gun. This was designated the M6 GMC, and was simply a 3/4 ton truck with a 37 mm gun mounted in the rear compartment. A large number were produced, equipping one platoon in each company, but this was abandoned after November 1942 and the vehicles exchanged for M3 GMCs. The M6 saw only limited service in North Africa, and was declared obsolescent in 1943. A few were used by Free French forces in Europe in 1944–45, and the 37mm gun mounts were added to a few M2 halftracks at the unit level.