Cheat Codes for the "Security Clearance" Menu
     At   the   main   menu,  hold  down  all  four  shoulder  buttons
(L1+L2+R1+R2)  at  once, for about 3 to 4 seconds, until the "Security
Clearance" cheat menu pops up.
     To  enter  the letters for the codes, hold down the X button over
the character you wish to change, then move the + button left or right
to  change  the characters, then let go of the X button to move to the
next  character using + button. Once all the characters are entered in
correctly,  press  the  Square  button, and the cheat code should turn
orange.

Cheat code:        Effect:
66BAUER            Invulnerable
62ALMEIDA          Infinite Ammo
72DESSLER          All Missions
54PALMER           All Bonuses
BAUER066           Invulnerable
ALMEIDA062         Infinite Ammo
DESSLER072         All Missions
PALMER054          All Bonuses