The Game is Called "Aces High". I believe the focus should stay true to that name. Yes, it would be nice to have a Sherman or some allied tank BUT its not why the majority of the people play the game.
If your looking to get some good ground warfare going try WWII online. Its pretty decent. I myself will stick with AH.
See you in the air....well, ok at least as im tumbling out of the sky in a ball of flames
