Start the game as normal with just one bazooka shell.  Arm the 

        weapon, press and hold the fire button.  Now press 'ESC'.  Go to

        the armory and get rid of all your rockets.  Now you can start the

        mission with infinite supply of bazooka shells.  The same applies to

        all weapons as well.

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ADDITIONAL CHEATS (from OLLIVision)

After a Game Over, insert a copy of the Roster disk into the drive and follow the program instructions. In the menu, quickly insert the other Roster disk and all characters will be alive again!