M2 Medium Tank

M2 Medium Tank The M2 Medium Tank was an American armored fighting vehicle developed in the late 1930s and fielded in the early years of World War II. It served as a transitional design between interwar experiments and the later standardized M3 Lee and M4 Sherman, influencing doctrine at institutions such as the United States Army Armor Branch and the Armored Force (United States).

Development and Design

The M2 originated from requirements issued by the United States Army Ordnance Department and concepts debated at the National Defense Act staff conferences, influenced by observations from the Spanish Civil War and staff exchanges with the British Army and French Army. Design work involved teams at Rock Island Arsenal and the Aberdeen Proving Ground, with consultation from engineers at Schenectady and companies such as General Motors, Ford Motor Company, and American Locomotive Company. Early prototypes were trialed alongside contemporaries like the Light Tank M2, the T6 Medium Tank, and foreign models including the German Panzer III and the Soviet T-34, informing armor layout and suspension choices. The hull and turret arrangement reflected lessons from the Interwar period and debates presented at the Infantry Board (Fort Benning), leading to a four- to five-man crew arrangement and incorporation of the vertical volute spring suspension developed by Cleveland Tank Plant engineers.

Specifications

The M2's dimensions and mechanical package were defined during trials at Aberdeen Proving Ground and performance tests at Fort Knox. The vehicle weighed roughly 18 to 21 short tons, with a length near 18 feet, width about 9 feet, and height approximating 8 feet, carrying a crew of four to five including commander, gunner, loader, driver, and radio operator. Power came from a Continental R-975 nine-cylinder radial engine also used in vehicles like the M3 Lee and aircraft such as the B-17 Flying Fortress prototypes for parts compatibility considerations. Running gear used vertical volute spring suspension similarities with later M4 Sherman components; transmission and steering systems were tested against standards set by the Ordnance Department and compared with systems in the British Matilda II and French Char B1. Electrical and radio equipment followed specifications from the Signal Corps and used sets standardized with other armored vehicles.

Armament and Armor

Primary armament consisted of a 37 mm gun mounted in a rotating turret; supplementary weapons included coaxial and hull-mounted .30-06 M1919 machine guns and a cupola-mounted .50 Browning M2. The 37 mm weapon reflected U.S. anti-armor thinking of the late 1930s and was comparable to guns on vehicles like the British Vickers Medium Mark II. Armor thickness varied across the hull and turret, offering protection against small arms and shrapnel, influenced by experiences analyzed from the Spanish Civil War and trials at Edgewood Arsenal. Ballistic performance, penetration tables, and stabilization trials were conducted at Pacific Proving Grounds and Watertown Arsenal, with armor steel produced by firms including Bethlehem Steel and Carnegie Steel Company under Ordnance specifications.

Production and Variants

Production contracts were awarded to arsenals and private firms after approval by the Chief of Ordnance and the War Department. Approximately 1,100 vehicles were built between 1939 and 1941, including subvariants with changes to turrets, radio installations, and hull machine-gun placements. Notable developmental offshoots and comparative designs included the M2A1, M2A2, and M2A3 series, which informed the layout of the M3 Lee and components later standardized on the M4 Sherman. Industrial participants included Rock Island Arsenal, Baylor Manufacturing, Cadillac Division, and subcontractors tied to Republic Steel and General Electric for electrical systems. Programmes coordinated with the National Defense Research Committee and influenced Lend-Lease deliberations at the Department of State, though few M2s were sent overseas under such schemes.

Operational History

The M2 saw limited combat use and primarily served in training, doctrinal development, and evaluation regimens at Fort Benning, Fort Knox, and the California Tank School. Crews and instructors from the Armored Force School and officers assigned to units such as the 1st Armored Division and 2nd Armored Division used M2s to develop tactics later employed in campaigns in the North African Campaign, Operation Torch, and the European Theater of Operations (ETO). Elements of the United States Marine Corps used M2s in amphibious training exercises influenced by planners at Naval War College and liaison officers from the Amphibious Forces (United States Atlantic Fleet). Combat assessments compared M2 performance with vehicles like the Panzer III and Valentine tank, shaping U.S. procurement decisions at meetings of the Combined Chiefs of Staff.

Surviving Examples and Legacy

Surviving M2 specimens are preserved in museums and collections including the National Armor and Cavalry Museum, the U.S. Army Ordnance Museum, the National Museum of the United States Army, and international museums that house interwar armored vehicle collections. The M2's design lineage is evident in the M3 Lee and M4 Sherman, and its service informed doctrine codified in field manuals issued by the War Department, influencing armored tactics taught at the United States Military Academy (West Point) and the Command and General Staff College. Historians at institutions such as the Smithsonian Institution and authors from Office of Military History have examined its transitional role between interwar experiments and mass-production wartime designs. Category:Medium tanks of the United States