G.I. Joe: The Rise of Cobra -- The Game Cheats (PSP)

At the game's title screen, enter the following codes 

with the D-pad to unlock Classic Uniforms. A "Yo Joe!" 

sound effect will play if you entered the code correctly.  

This unlocked costume will be available from the start of 

the game.

Shana "Scarlett" O'Hara - RIGHT, UP, DOWN, 

DOWN, TRIANGLE

Duke - LEFT, UP, SQUARE, UP, RIGHT, 

TRIANGLE