Source:
https://www.podbean.com/media/share/pb-us5ia-a3a2ac

The Medium Tank M3/ Grant/ Lee was the first American medium tank to carry a 75mm gun, and played a significant part in the fighting in North Africa in 1942, but it was always seen as a interim design as its main gun was carried in the right of the hull, and it had been rushed into production to fill a gap before the arrival of the Medium Tank M4 Sherman.