Enter the following codes at the 'Main' Menu to begin a new game with the corresponding rank and specieal features that come with it like extra weapons and ammo.

Unlock Lieutenant:
R1, L2, L1, R2.

Unlock Private:
Square, Circle, Triangle.

Unlock Sergeant:
Triangle, Circle, Square.

Unlock Captain:
Circle, R1, Circle, L1, Triangle, R2.

Unlock Colonel:
Triangle, Square, Circle, Square, Triangle, Circle.

Unlock Major:
L2, Square, R2, Triangle, L1, Circle, R1.

Unlock Master of X-Squad:
Circle (x4), Triangle, Square (x4).

Unlock General:
L1, L1, L2, L2, R1, R1, R2, R2.