Half-track is a vehicle that utilizes both tracks and wheels as running gear. Early 30s?The U.S. Army purchased a license to develop half-tracks and experimented with half-track adapters. The mobility of the vehicle improved markedly when using these adapters. The best known American half-tracks were the M series made as a standardized design by Autocar, Diamond T, International and White. The M series had a similar front end to the White M3A1 Scout Car but used more powerful engines: a 147bhp 6.3-liter White AX in the Autocar, Diamond T, and White, and a 143bhp 1HC in the International. Each version had four-speed gearboxes with two-speed transfer boxes and drive to the front axle as well as the tracked bogie. The M series half-tracks were widely used by US forces in most theatres of the war, and were also supplied under the Lend-Lease Program to Great Britain, Canada and the Soviet Union. A total of 41,170 were made. The M16 quadmount version of the half-track proved very successful and became the standard light anti-aircraft armored vehicle.

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