Invisible Player
At the main menu press R1, L1, X, 0, 0,Square, Square , R1, and 0
Submitted by Alf
Level Select
At the main menu press R1+R2, L1+L2, Circle, Square
Submitted by Alf
Unlock Weapons
At the main menu press X two times then Triangle, O, Up, Up, Down, Square, and then Triangle
Submitted by Alf
Tips/Hints
Dem's is Gernades!
The tan soldiers like gernades, so if you see something incoming, you should get used to hitting L2 to roll out of the way
Let them take the fire
Some missions you have troops to back you up. You can let them take some of the heat off you so you can sneak behind the tan for some easy kills