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.