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The T71 had a new turret with curved sides. M36 90mm Gun Motor Carriage crossing the Rhine In November 1943 the T71 was accepted for limited procurement, and it wasn't standardized until June 1944, when it became the M36 90mm Gun Motor Carriage.
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Work began to speed up in March 1943 and a prototype was ready for trials at the Aberdeen Proving Ground by the summer of 1943. Early encounters with the heavily armoured Tiger I in 1943 had slightly shaken that complacency, but work on the T71 still progressed rather slowly. Unfortunately in 1943 neither the Tank Destroyer Centre nor the US Armored Force believed that they needed a more powerful anti-tank gun, and were instead confident that the 75mm gun of the Sherman and the 76mm gun of the M18 Hellcat would be perfectly adequate. This was a more straightforward vehicle that carried a 90mm gun on the chassis of the M10A1 Gun Motor Carriage, and would have been a very valuable weapon if it had been available in large numbers in 1944. Work began on the T71 90mm Gun Motor Carriage in October 1942.
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