The M4 Sherman was used by US, UK and the Soviet Union, the M4 was also used in many variants and was beefed up with a bigger gun late in the war. I believe it was a 17 pdr gun on the Firefly if I'm not mistaken. The T-34 would be the alternative.
How about making 2 versions of each type? Both the M4 and T-34 were upgraded many times leaving room for different versions be put in AH2 with the only difference being their turrets and armament. That way we'd have tanks from all sides, GE, US and SU. A rather time & work efficient option instead of making different tank types.
Planes:
HE-111
Do 217
Hs-129 "Panzerknacker"
B-24
B-25
Pe-2
a carrier compatible 109
