When you start the 1st level, after the video (of you jumping out of a chopper in to terrorist land) push Left, Left, X, Right ,Circle, R1, R2, L2, R2. This will give you all the guns and a couple extra little bonus', The 2x barreled shotgun. If you cycle your inventory you will also find the double sided commando blade. Try coming up behind an enemy and put him in a choke.

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Beat the game on Lieutenant.

Beat the game on Lieutenant Commander.

Beat the game on Lieutenant JG.

There are two outhouses on level two. One is down by the river, one is close to the Cabin. Blow up the outhouse near the Cabin by planting some C4 on it. If you do it right, Boomer will say,"I guess I'll have to hold it, right sir?"

Beat the game on Ensign.

Press R3 to reload and you won't lose a clip - technically. You'll simply replace the half-empty clip with a brand new one, though you'll still be using up bullets.

Beat the game on "Lieutenant JG" difficulty to unlock level select.

Beat the game on Rear Admiral difficulty.

Beat the game on "Ensign" difficulty to unlock terrorist weapons. Beat the game on "Lieutenant" difficulty to unlock the Multiple Grenade Launcher.

Beat the game on Captain difficulty.

Beat the game on Commander difficulty.