Return Fire: Maps of Death (3DO)

Unlimited vehicles:
This code must be done separately for each vehicle and must be repeated if a new map is started. Choose a vehicle from the vehicle select screen. Press C to display the fuel/ammunition screen. Hold LS + RS + C, then press X. The "Leave Game" option will be displayed. Keep those buttons held, then hold Down and press A. Three light blue shadows of the selected vehicle will appear.