[PS2] [Cheats] Tom Clancy's Ghost Recon
 

Missions Unlock:
When the cinema screen appears press a button as soon as the title screen comes up and says start very quickly press this code in
X L2 TRIANGLE R2 SELECT.
It Should be a different picture when you come to the start up screen if it worked

Get All Special Features:
When the cinema screen appears press a button as soon as the title screen comes up and says start very quickly press this code in
L1, L2, R1, R2, X, Select

Be invincible:
When the cinema screen appears press a button as soon as the title screen comes up and says start very quickly press this code in
L1, R2, L2, R1, Select

Extra Levels:
After you beat the 15 levels don't think you are done ! There are another 8 levels that take place in the desert called "Ghost Recon Desert Siege"

Source? Here it is.