Press start and hold L1, R1, press Square, Circle, Circle, Triangle, X, Triangle, Square, Left, Right, Up, X.
All weapons
During any mission hold select and start and quickly press X, X, Circle, X, Left, Down, Square. You will also get a new weapon called 'Marooner'.
Private rank
At the title screen, press Square, Circle, Triangle, then start a new game. This results in a game with Michaels 9mmS, 99 clips, and bonus points displayed when earned.
Sergeant rank
At the title screen, press Triangle, Circle, Square, then start a new game. This results in a game with no weight limit, Taylor M82, Michaels 9mmS, 99 clips, and bonus points displayed when earned.
Lieutenant rank
At the title screen, press R1, L2, L1, R2, then start a new game. This results in a game with a level 2 shield, no weight limit, Taylor M82, Michaels 9mmS, 99 clips, bonus points displayed when earned, and a 10,000 point bonus when a level is completed.
Captain rank
At the title screen, press Circle, R1, Circle, L1, Triangle, R2, then start a new game. This results in a game with radar, no weight limit, Taylor M82, Michaels 9mmS, 99 clips, and bonus points displayed when earned.
Major rank
At the title screen, press L2, Square,R2, Triangle, L1, Circle, R1, then start a new game. This results in a game with a level 3 shield, Level 3 sensor, radar, no weight limit, Taylor M82, Michaels 9mmS, 99 clips, and bonus points displayed when earned.
Colonel rank
At the title screen, press Triangle, Square, Circle, Square, Triangle, Circle, then start a new game. This results in a game with a level 3 shield, level 3 sensor, radar, no weight limit, beginner level of all weapons, 99 clips for each, and bonus points displayed when earned.
General rank
At the title screen, press L1(2), L2(2), R1(2), R2(2), then start a new game. This results in a game with a level 3 shield, level 3 sensor, radar, no weight limit, intermediate level of all weapons, 99 clips for each, and bonus points displayed when earned.
Master of X-Squad rank
At the title screen, press Circle(4), Triangle, Square(4), then start a new game. This results in a game with a level 3 shield, level 3 sensor, radar, no weight limit, master level of all weapons, 99 clips for each, and bonus points displayed when earned.
