Enter one of the following codes during a mission to
activate the corresponding cheat function. Note: The cheats will
only function in v1.03 and may not be enabled in multi-player
mode.

Code
Toggle overview of battlefield [Ctrl] + [F12]
Full ammo [Alt] + [Shift] + R
Repair damage [Alt] + [Shift] + D
Selected tank is invincible [Alt] + [Shift] + I