Im not sure if this would be early war or mid war, but how about we ad the m3 grant as a tank.
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Armament: 1 - 75mm gun
1 - 37mm gun
3 - 0.3" MG
Engine: Wright R975, air cooled, radial
9 cyl. gas, 340 hp
Speed: 26 mph
Range: 120 miles
Crew: 6
Weight: 30 tons
This Would also be good for scenarios because we wouldn't have to substitute as many tanks.