Tom Clancy's Ghost Recon Cheats

Purple Heart: Get wounded or killed in action.
Bronze Star: Get 15 kills
Silver Star: Get 20 kills
Distinguished Service Cross: Get 25 kills
Congressional Medal Of Honor: Get 30 kills

Enter on in-game pause menu, L1, R2, L2, R1, Select

Unlock All Missions, Enter on Title Screen: X, L2, Triangle, R2, Select

Unlock All Special Features, Enter on Title Screen: L1, L2, R1, R2, X, Select

Two Dimensional Mode: Press Back then B, A, X, Y, A. Now when you look at the other soldiers on your team, they will be two dimensional.

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"