On the server PlayStation 2, press R1(2), L1(2), R1, L1 at the "Press Start button" screen. If you entered the code correctly, you will hear the sound of a drum. Press Start to continue with your server setup. The code does not need to be entered on the client PlayStation 2s that will join the game. Note: Online voice chat is normally only available in two player online games. Allowing it to be used by more players will effect bandwidth and game play quality. An upstream bandwidth of 512 Kbps is recommended.
Successfully complete a campaign on the veteran difficulty setting to unlock its corresponding bonuses. It is not necessary to play on the elite difficulty setting to unlock anything.