In early 1944, it was time to decide what tank to build for 1945 service, and also to decide what modifications to ship for tanks already fielded. These readings from the archives should give an idea of why the European Theater wanted a 90mm gun Sherman, why Armored Force wanted a 90mm gun Sherman, and why it wasn't going to happen.
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The Chieftain (Real name Nicholas Moran) is Wargaming America's resident tanker and amateur historian.