 On 21 September 1945, a set of requirements were laid down for a squad sized armored personnel carrier, based on the chassis of the T43 cargo carrier.On 26 September 1946, the development of the T18 armored utility vehicle was approved with the International Harvester (IHC) contracted to produce four prototypes.The original mockup, which was designed to carry 14 people, including crew, featured two remote controlled .50 caliber machine guns, which could be aimed remotely by either the commander or either of the two gunners.