Tanks would be nice to have, but they need to be limited. By limited i mean, make it very hard to repair it back to working order and have fuel hard to find. Have three seats Driver, Gunner, and commander. Lock it into first person mode for driver and gunner. Commander should be able to pop his head out of the top to enter 3rd person view. Make it so one person can do anything, be the driver, gunner, or commander. But require the player to exit the tank to change positions. There should be a little delay to reenter the tank when changing positions. RPG's and IED's should be a one hit kill for balance. A grenade to the side should take out a track and one to the rear, wastes the engine.