A1 modification allowed the weapon to be fixed facing forward and fired from within the vehicle. M2 w/ M3 37 mm Mechanized infantry units in the US Army were supposed to receive the M6 Gun Motor Carriage, based on Dodge light trucks. With the overall failure in combat of these vehicles, some units removed the M3 37 mm guns and their assemblies and mounted them on M2 half-track cars. Anti-aircraft variants Multiple Gun Motor Carriage T1E1 M2 based mobile anti-aircraft gun featuring an open rear with a Bendix mount featuring two .50 inch (12.7 mm) M2 machine guns. The Bendix mount proved to be unsatisfactory. Prototype only. MGMC T1E2 As T1E1 with Maxson M33 mount in the place of the Bendix mount. The M33 mount also featured two .50 inch M2 machine guns. Would be developed into the M3 based T1E4. The T1E2 was rebuilt as the T61 with Maxson quad turret. MGMC T1E3 M2 fitted with a partial hard top and a Martin turret, identical to that used on the Boeing B-17 Flying Fortress. Proved to be overcomplicated and was ill-suited to the space available in the M2. Prototype only. T28 CGMC M2 based combination gun motor carriage with a single 37 mm Gun M1A2 autocannon flanked by two .50 inch M2 machine guns. The side armor was removed in order to make room for the mount. The project was canceled in 1942 but then revived the same year, when a decision was made to use the longer M3 half-track personnel carrier chassis for the subsequent T28E1 See also List of U.S. military vehicles by supply catalog designation List of U.S. military vehicles by model number Notes References Green, Michael ; Green, Gladys. Weapons of Patton's Armies. MBI Publishing Company, 2000 Mesko, Jim. M3 Half-tracks in Action. Carrollton, TX: Squadron/Signal Publications, 1996 SNL G102 TM 9-2800 army vehicles dated 1947 United States, War Department. TM 9-710 Basic Half-Track Vehicles (White, Autocar, and Diamond T). Washington, DC: War Department, 1944. External links AFV Database World War II Vehicles - US Half tracks World War II armored fighting vehicles of the United States Reconnaissance vehicles of the United States World War II half-tracks Half-tracks of the United States Military vehicles introduced from 1940 to 1944