At the main menu, enter the following codes to start to which ranks. 
If you entered the code right, you will hear a gunshot.
NOTE: The higer the rank, the more you have weapons and gadgets unlocked.
      Ranks above Private have no weight limit.

Private Rank: 
Press Square, Circle, Traingle - You'll start 
with the michaels 9mms, 99 clips and the bonus
points will be displayed when you earn them.


Sergeant Rank: 
Press Triangle, Circle, Square - You'll start 
with the Taylor M82, no weight limit, Michaels 
9mmS, 99 clips and the bonus points will be 
displayed when you earn them.


Lieutenant Rank: 
Press R1, L2, L1, R2 - you will start with the
level 2 shield, the Taylor M82, no weight limit,
Michales 9mmS 99 clips and the bonus points will
be displayed when you earn them plus you will 
arn 10,000 points when you finish the level.


Captain Rank:
Press Circle, R1, Circle, L1, Triangle, R2. 


Major Rank:
Press L2, Square, R2, Triangle, L1, Circle, R1 


Colonel Rank:
Press Triangle, Square, Circle, Square, Triangle,
Circle. 


General Rank:
Press L1, L1, L2, L2, R1, R1, R2, R2.


Master of X-Squad Rank: 
Press Circle, Circle, Circle, Circle, Triangle,
Square, Square, Square, Square.


by unknown