M4 Tractor
The M4 High-Speed Tractor for World War II was an artillery tractor used by the US Army from 1943. Design and development. The M4 High Speed Tractor used M4 Sherman tracks, roadwheels and drive sprocket. One variant was designed to tow the 90 mm anti-aircraft gun, and another was for the 155 mm gun or 8-inch howitzer. The rear compartment carried the gun crew and other equipment and some later variants included a crane to assist with heavier projectiles. Two types of ammunition boxes were used on all models: a 90 mm box with side  tailgates to access 90 mm shells pigeon-holed in the sides, and a combination box for 155 mm or 8-inch ammunition. History. The M4 was built by tractors manufacturer Allis-Chalmers of West Allis, Wisconsin, starting in 1943 and was in U.S. military service until approximately 1960. After WWII, under the US Mutual Defense Assistance Program, M4s was supplied to Greece, the Netherlands, Japan, Brazil, Yugoslavia and Pakistan and several other states friendly to the USA. In the Indo-Pakistani War of 1965 the Pakistani Army used M4 Tractors to haul their M115 Howitzers to the battlefield of Chamb  and then to the front at Lahore during the fighting with Indian troops. Civilian use. After the war many types of these tractors were stripped of their military components and used for log skidders and power line construction. Many were used as carriers for rock drills, used in logging road construction in British Columbia. The first prototype was designed in the early 1960s by G.M. Philpott Ltd. of Vancouver, BC, and Scott-Douglas Industries, who supplied the M4 Carrier. It was used by MacMillan, Bloedel, and Powell River Company at their Juskatla, BC logging operation. Many improvements were made and  when Finning Tractor later bought G.M. Philpott, the machine became the Finning Tank Drill. At least 500 were built, many of which are still in service. The original Finning Tank Drill was replaced by the M32F and M40F Tank Drills, which used larger Sherman tank carriers. At Amsterdam Airport Schiphol in the Netherlands, at least two refurbished M4s were used by the airport fire brigade in the 1960s and '70s.