SWAT - Global Strike Team:
Invincibility:
During gameplay pause the game and press Up, Down, Left, Right, Left, Right, L2, R2
Unlimited Ammo:
During gameplay pause the game and press Left, Right, Up, Down, Up, Down, R2, L2
Unlock All Stages:
On the mission select screen press Up, L1, Down, R1, Left, L1, Right, R1, Up