Ghost Recon

Press Back then press A, X, B, Y, A during game play. A message will confirm correct code entry.

Successfully complete all fifty dossier missions. The following codes can now be enabled.

In the multi-player day Castle level, go to the house near the broken fence. Go to the right side of the door and crawl into the corner between what appears to be a trash can or box as far as you can. Then, stand up and you can shoot out. If an enemy enters the house, they can see and shoot you but you cannot do the same. The only way out is to go through the door.

Go to the house on the southwest side of the map. Lay down on the porch and you will notice a cylinder. Get close enough to it and you will see a shaded triangle. Try crawling between the triangle and the cylinder, and you will notice that the walls have disappeared. Stand up or kneel, and you can shoot people. Note: If someone comes in the house they will be able to see you.
Jameson Fehlhaber.

In the day Docks level in Xbox Live!, have a pair of binoculars out and go near a box. Lay down and start to crawl into it. This will only work on the small metal boxes with the wood frames at the bottom. The enemy will still be able to shoot the box and kill you. Sometimes if you do not do this correctly, your feet will stick out of the box, making you an easy target.

If you have binoculars, go in front of the metal box in between the office and the other building. Make sure there are two boxes behind you. Lay down flat and take out your binoculars. Start crawling forward to get in the box.
Jameson Fehlhaber.

In the day Docks level, go to the crater in the corner of the map. Go to the next one over and you will see a rock near some boxes. Take out binoculars and lay down on your stomach in front of the rock (not in the gap). You should lay down directly in front of the largest smooth area. Then, with your binoculars still out, start crawling forward. If done correctly, you will notice that the rock has disappeared, because you are inside it. You can stand up and walk around. If you move forward, you will notice some boxes to your left. You can easily walk in them and shoot people from there, but be careful not to go too far out; you might walk out of the boxes and get shot.

This trick can be done with any door on the Docks level (MP05), but is much easier at the building in the northeast (with all the offices). First, go inside one of the buildings. Open a door from the inside. Try to use the south entrance of the office buildings. Next, crouch in front of the open door so that the black square on the door is directly in front of you. Close the door and immediately lay down. The door should be trying to close on you. Use the Analog-stick to slightly move out the door. Try to line your waist up with the frame of the door so that your legs remain inside the building. Once you have positioned yourself accurately, face the crates closest to the door. Then, hold Left on the D-pad for a second and release. Your screen should become orange/white and you should be outside the door. Finally, get up, reopen the door, and walk inside. You should be able to see the entire area around the building. You can take enemies out from inside the building. There are a few drawbacks. Only the host can shoot people on the outside. Other people can do the glitch, but will not be able to shoot. Once an enemy steps inside the building you will not be able to see them and they can kill you. You can do this glitch with many doors in the game that open in the same way. To get out of the glitch, walk out the door and keep going until your screen returns to normal.

In the Embassy level, by the broken car bridge, there is a set of steps. At the top of the steps, there is a little "panel" that you can see through and shoot people, but they cannot see you. It is easier to find the panel if you are laying down and are zoomed in.

Get in front of a tank then go into the prone position and press Back. The tank will roll over you. Press Up to get up to crouch. You will be inside the tank.

In the P.O.W. Camp level, all cabins can be crawled under. When you stand up, you will be inside the walls. You can shoot out and cannot be hit, except for your feet, but they are a small target.

Go on the top balcony and lay down by the door to the left of the stairs in the little gap. You will notice that you may be hanging over the edge. Try crawling off the edge and you should see a door below you. If you kneel, you will fall and most likely get wounded and see white. However, if you try looking at a wall, you will see through it. Be careful, as people can easily shoot you.