SOCOM 2 - US Navy SEALS Cheats

To our current knowledge there are no cheats codes which you can just tap in with your controller, but there are a number of unlockables which can be done...

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Unlock Characters
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Sabre - Finish the Albania missions on Commander.
Pius Platz - Finish the Albania missions on Lieutenant.
Feral - Finish the game on Admiral.
Quixada Christo - Finish the Brazil missions on Commander.
Reaver - Finish the Algeria missions on Commander.
Algerian Officer - Finish the Algeria missions on Lieutenant.
The Specialist (Flatfoot) - Finish the Russia missions on Commander.
Valeska Lukanov - Finish the Russia missions on Lieutenant.

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Unlock Credits
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Finish the game on Ensign or above.

Unlock Jukebox Songs
SOCOM II Online Theme - Already unlocked.
Dance of the Unknown - Finish the game on Lieutenant.
Insertion Suite - Finish the game on Lieutenant.
Infiltrator - Finish the game on Lieutenant.
Contortion - Finish the game on Lieutenant.
Tari Tari - Finish the game on Lieutenant.
KGM - Finish the game on Lieutenant.
Gnostec - Finish the game on Lieutenant.
Dark in Your Heart - Finish the game on Captain.
Beach Bossa - Finish the game on Captain.
Brazilicious - Finish the game on Captain.
SOCOM II Finale - Finish the game on Captain.

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Unlock Movies
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Albanian Intro Movie - Already unlocked.
Brazilian Intro Movie - Finish the Albania missions.
Algerian Intro Movie - Finish the Brazil missions.
Russian Intro Movie - Finish the Algeria missions.
Making the SOCOM II Music Movie - Finish the game on Lieutenant.

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Unlock Weapons (Single Player)
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SEAL Weapons: Finish the game on Ensign. Terrorist Weapons: Finish the game on Lieutenant.
SAS Weapons: Finish the game on Commander.
Spetsnaz Weapons: Finish the game on Commander.
MGL (Multiple Grenade Launcher): Finish the game on Captain.
OICW: Finish the game on Admiral.
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Unlock Art/Production (Art Gallery)
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Finish the game on Commander.

Once you've located the ladder to the drug lab, tos your grenades down
there to clear it.  Go down the ladder and clear out all scum waiting
for you.  Look in a dark room and pick up the RPG rocket launcher. 
Order able to place satchel near the barrals.go out the back door of the
coke lab. Head up hill until the satchel charge goes of.  Clear the hut
, then head down hill until you reach the ciff.  You should be able to
see the plane in the hanger.  By this time, the helicopter should be
airborne.  Ignore it.  Blow up the plane with your launcher and they
have no chance of escape.  Now shoot at the heli until black smoke comes
out. It should stop circling you.

Take out your rocket launcher. Face it down and launch it. When this is done, you will not see it blow up on the ground. You will see it go flying and when you look in that direction it will be gone.

After meeting with the informant Mallard, go to the largest section of ruin just past
the building that you met him in. There should be a guard patrolling it and a few
boxes of ammunition lying around. Once at this ruin, turn left so that you are
facing towards the road that connects to the bridge. There should be a small
section of wall, on which a Sr-25 SD is located. Getting this weapon will allow you
to kill the guards and the sniper in the watchtower easier, which should prevent
the alarm from being raised.