Unlimited Ammo & All Weapons:
You must achieve records in all of the L.E.I.L.A tests, then finish the game. You should recieve a message under you statistics that says "You have recieved the Special Award." Now save when prompted. Then start a New Game, and when you get up to the L.E.I.L.A Office go to the * box. Check inside for all of the weapons fully loaded.
After beating the game, you will be prompted to save. Answer "Yes" and the game will start again, but will be marked "V2." It's more difficult this time around. This can be done again up to "V8."
Thanks to Revolution readers Chris Lees and Harvey Morgan!