This interesting article on the M6 tank showed up on my Facebook timeline.
The M6 is one of those military options that the US Army pursued and then dropped. Through 1940 and the beginning of the war the US Army initiated these various armored vehicle and self propelled gun project as stopgaps and in response to evolving doctrine. As the war progressed and these various vehicles proved to be redundant, the programs were reduced to a barely sustained level and then canceled altogether. So if the question is ever asked why the US didn’t design a heavy tank, the answer is that they did. Then the Armored forces decided that the gains were not worth the resources.
I posted a while back about the Combined arms doctrine used by The US Army.
One thing you learn is that the US Army while pursuing options, in case of a failed strategy, stuck to choices based on logistics. Which led to the choices for things like the seemingly inadequate Sherman. The people in charge knew though, that a tank on the field in the action was far better than a “better” tank that’s sitting on the roadside or stuck in the field because of a faulty transmission.
Some more Sherman stuff.
Which comes down to making the choices that win.
Tank factories 1916-1945