Metal Gear Solid : Portable Ops - Cheats

Character Passwords (NTSC Version)
At the password screen, enter the following:

R.R.R. : Unlock Ocelot.
PK +ESP : Unlock Ursual.
E.APPLE : Unlock Eva.
!TRAUMER : Unlock Ga-Ko.
ERBE : Unlock Gene.
JUNKER : Unlock Cunningham.
THE-L : Unlock Elisa.
1+2-3 : Unlock Major Zero.
Hunter-n : Unlocks Null.
PM-EMS : Unlock Paramedic.
LQ.N2 : Unlock Python.
IVN =RV : Unlock Raikov.
DARPA-1 : Unlock Sigint.
SATURNV : Unlock Solokov.
T.F-ACID : Unlock Teliko.
MGA2VE : Unlock Venus.

To unlock the relevant characters, complete the following tasks:
Cunningham: On any difficulty, defeat Cunningham through stamina and complete the game before 1971. He will be available next game.
Elisa: Unlock Elisa after getting a Medic level of 80.
Gene: Stamina kill Gene and recruit 200 soldiers in the same game.
Major Zero: On your second playthrough, he will be available, if you have a MGS:DGN save on the same stick.
Null: Kill him on the second battle and he'll be available on your second playthrough.
Para Medic: On the Comm Tower stage, contact her. She need rescuing in the Hospital stage, place spies there as well.
Python: Stamina kill
Raikov: Get spies in the Western Wilderness, then complete the Guard House mission. You should receive a report after the Guard House mission.
Sigint: When Snake is captured and rescued, contact Signit on the Comm Tower stage, then rescue him in town.
Sokolov: Give Sokolov the Saturn V blueprints
Teliko: Have an Acid save on your memory stick, and Teliko will be available on your second playthrough
Venus: Have an Acid 2 save on your stick, and Venus will be available on your second playthrough.
Additional Unlockables: Beating the game unlocks the Extreme Difficulty mode Beating the game with a combined Tech level of 99 unlocks the Stealth Camo.

P/S :There is no space after the plus sign.