Well i see M1A1 Abrams there,so i guess we won't see the challenger 1 in the game right?
Anyway the major challenger of the M1A1 Abrams should be the T-80B i think.I mean we had T-72 against M60 in the game so yeah i think T-80B against the Abrams makes a lot of sense.
I see some M2 Bradleys,we used them in the game already.Their challengers are the BMPs.We also used M113s and i cannot think of a challenger for it sry.
I also see some M163 Vulcans but i don't have any eastern vehicle in mind to be used by the house of Green.
I recognize the M109 SPG Artilliery if i'm not mistaken,so it's counterpart should be the 2S3 Akatsiya.
About the choppers we used them in game too,it's the Mi-24 Hind against the AH-1 Cobra.
So that's all i can come up with.If anyone has a better eye or knows some more fitting challengers i'd love to see them.