SOCOM 3: U.S. Navy SEALS cheats and cheat codes for Playstation 2

Reveal coordinates
Pause the game play and enter Square, Triangle, O, O, L1,
Triangle, O, O, Triangle, Square. Continue the game play and your current
coordinates will be revealed in the corner.

Bonus weapons:
Complete a single player game under the indicated difficulty
setting to unlock more weapons for single player or training modes.

IW-80 A2: Finish any difficulty mode.
STG 77: Finish any difficulty mode.
SEAL weapons: Finish ensign difficulty mode.
Terrorist weapons: Finish lieutenant difficulty mode.
SBS weapons: Finish commander difficulty mode.
GROM weapons: Finish captain difficulty mode.

Unlock Medium Scope + Front Grip:
Complete a single player game under the captain difficulty mode.

Unlock Captain difficulty:
Finish single player mode in the Commander difficulty mode.

Unlock Admiral difficulty:
Finish single player mode in the Captain difficulty mode.