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In page M26 Pershing:

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The T25 and T26 lines of tanks came into being in the midst of a heated internal debate within the U.S. Army in the mid-1943 to early 1944 over the need for tanks with greater firepower and armor. A 90 mm gun mounted in a massive new turret was installed in both series. The T26 series were given additional frontal hull armor, with the glacis plate increased to 4 in (10 cm). This increased the weight of the T26 series to over 40 short tons (36 t) and decreased their mobility and durability as the engine and powertrain were not improved to compensate for the weight gain.