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In page M26 Pershing:

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In the spring of 1942, as the M4 Sherman was entering production, U.S. Army Ordnance began work on a follow-up tank. The T20 tank reached a mock-up stage in May 1942, and was intended as an improved medium tank to follow the M4.[5] An earlier heavy tank, the M6, had been standardized in February 1942, but proved to be a failure. The U.S. Army had no doctrinal use for a heavy tank at the time.[6][7]