Cheat: Press Start to pause game play during the Afghanistan-Pakistan Border mission, then press Circle(3), Square(3). Enemies will randomly appear as Osama Bin Laden.
Cheat: On the title screen, press circle 5 times and square 4 times. Do it fast and you should hear a sound confirming the code. Now before you start the game, go to special features. You will now be able to access the cheat menu.