Simply reload before you run out of shots on one clip.
Successfully complete the game with the best ending. Allow the credits to complete and an intermission sequence will begin.
Hold [Left Shift] and press [Keypad Minus] at the indicated screen. Release the keys, then type one of the following codes to activate the corresponding cheat function:
|All missions unlocked||Main menu||campaign|
|Saves game||During game||savegame|
|End current mission||During game||endmission|