The M2 half-track car is an armored half-track produced by the United States during World War II. Its design drew upon half-tracks imported from France in the 1930s, employing standard components supplied by U.S. truck manufacturers to speed production and reduce costs. The concept was designed, and the pilot models manufactured by the Firestone Tire and Rubber Company (before the prototype was officially labeled M2.) Production by the White Motor Company began in 1940 and was expanded to include Autocar. The M2 was initially intended for use as an artillery tractor, but also found use with reconnaissance units. International Harvester Company built the M9 half-track, a variant of their M5 half track, to fulfill the same purpose. History The concept of a half-track vehicle had been evaluated by the US Army Ordnance Department using Citroën-Kégresse vehicles. The Cavalry branch of the US Army found that their wheeled armored scout cars had trouble in wet terrain due to their high ground pressure. In 1938, the White Motor Company took the Timken rear bogie assembly from a T9 half-track truck and added it to an M3 scout car, creating the T7 half-track car. This vehicle was significantly underpowered. When a further requirement came down from US Army artillery units in 1939 for a prime mover to be used as an artillery tractor, a vehicle with an uprated engine was developed, which was designated the half-track scout car T14. By 1940, the vehicle had been standardized as the M2 half-track car. The M2 design was recognized as having the potential for use by mechanized infantry, which spawned the larger-bodied M3 half-track. Both the M2 and M3 were ordered into production in late 1940, with M2 contracts let to Autocar, White and Diamond T. The first vehicles were received by the Army in 1941. The M2 was supplied to armored artillery units as the prime mover and ammunition carrier for the 105mm howitzer, and to armored infantry units for carrying machine gun squads. It was also issued to armored reconnaissance units as an interim solution until more specialized vehicles could be fielded. Between 1942 and 1943, both the M2 and M3 would receive a number of modifications to the drive train, engine, and stowage, among other upgrades. Total production of M2 and derivatives by White was about 13,500 units. To meet the needs of Lend-Lease to the Allies, the International Harvester Company produced 3,500