In 1940, the year German Panzers rolled across the low countries and France, the entire tank development budget for the U.S. Army was only $90,000. Given that level of parsimony, it’s amazing we were able to develop the Sherman. Don’t forget, our “first” medium tank of the war, the Grant, had a side-mounted main gun, because we didn’t have the capability to mount a larger gun in a revolving turret.