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Invincibility:
Begin a mission, then pause game play. Press L1, R2, L2, R1, Select to become invincible.

All missions:
Press X, L2, Triangle, R2, Select at the title screen to unlock all missions.

All special features:
Press L1, L2, R1, R2, X, Select at the title screen to unlock all specials features.

Bonus levels
After completing the fifteen normal levels another eight levels that take place in the desert called "Ghost Recon Desert Siege" will be unlocked.

Medals

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

All heroes
Successfully complete the first twelve missions in campaign mode to unlock all twelve heroes as playable characters in quick mission and campaign modes. They include Henry Ramirez, Nigel Tunney, Will Jacobs, Jack Stone, Guram Osadze, Susan Grey, Klaus Henkel, Buzz Gordon, Lindy Cohen, Astra Galinksy, Scott Ibrahim, and Dieter Munz.

Sniping
If you are a sniper looking for your enemy when he is hiding in the trees, zoom in with your sniper gun. Look around the trees until the crosshairs turn red. When this happens, you can be almost sure that the enemy is there. You can either shoot him or take out your pistol to save yourself some ammo for your sniper gun, since you are already in position.

When playing in multi-player mode on the city Gold Mt. Level, there is a nice hidden sniping location. In the mission there was a shot down helicopter. To the west will be a strip of the road going down. Go straight ahead. On the front left side is a door. Enter it and go up the stairs to the end of the building. You should be looking out a third story window.

Recommended weapon
In multi-player mode, choose a rifleman and get Kit 6 (MP5 SD, extra ammunition). This kit will almost win every battle because it has a 30 shot clip and you can walk while looking in the scope. You will have great accuracy with most of the shots. It really does not matter what gun your opponent chooses, unless they select the same kit. The M136 and other powerful weapons take a long time to aim.

If you complete the (X) objective for each mission, you will unlock a new soldier. These soldiers have boosted stats and have their own specialist weapons. If these soldiers die, you will not be able to use them except in quick mission mode. You can also use their weapons in multi-player mode.

Black Needle: Easier completion
Leave Bravo at the insertion/extraction point. Take Alpha and secure the crossroads and rescue the soldiers in the buildings. Make sure you only have one soldier remaining (kill the other two if needed). Go back down the road where about five soldiers are waiting. Let them kill you. If done correctly you should have a mission complete.

Fever Claw: Sniping location
When playing in multi-player mode, find the large building with a Russian flag flying in front of it. Go through the gate and take a right, then a left, then another left, then turn around. There will be a stairway. Go up it into the building and go up those stairs. Take the first left and you will find a very nice sniping location.