t14

The Assault Tank T14 was a joint project between the United States and the United Kingdom with the goal being to produce a universal infantry tank.
The T14 project never came to fruition, as a pilot model was not delivered to the UK until 1944 by which time the British Churchill tank had been in service for two years and greatly improved over its initial model. US efforts working on a similarly well-armoured tank but with a higher speed for use other than in infantry support led to the T20 Medium Tank.

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