I'm pretty sure that you can't get march on artillery... am I mistaken?
I didn't think they could get medic promotions.
Yea you are. You can make march artillery but the cant get blitz or commando. And while tanks get blitz and commando they cant get march. I double checked.
So I guess my WP/GG city should pump out the tanks and the Red Cross city should handle artillery. Games usually end before I could make great use of all this. But I can always just turn certain conditions off.