Invincibility (self)
At the main menu or while the game is paused, select the "Enter Cheats" option, then press B(2), X, A. Your first soldier will be invincible, but the remaining members of your platoon can still be harmed.
Invincibility (team)
At the main menu or while the game is paused, select the "Enter Cheats" option, then press B(2), X, B.
Refill ammunition
At the main menu or while the game is paused, select the "Enter Cheats" option, then press B(2), X(2).
Autowin
At the main menu or while the game is paused, select the "Enter Cheats" option, then press B(2), X, Y.
Water source
In all the levels with a river or stream, if you follow it to its source you can see that it's flowing out of solid rock.
Under Armor reference
During the training mission, go to the rifle range and get a sniper. Stand in front of Alicia Diaz. Make sure you are standing on the range and she has her weapon down. Zoom in on her neck. Notice that she is wearing Under Armor, and that it has the Under Armor logo and writing on it.
Problems loading the game
Many of the first game discs shipped contained glitches that caused the game to not load properly. If you experience problems loading the game, try the following three steps:
1. Make sure that your game disc is clean and free from of any blemishes or marks. If it is dirty or scratched, try to clean the disc with an approved cleaning solution.
2. Unplug all game controllers at the Ghost Recon 2: Summit Strike splash screen and allow all the introductory videos to play through. Once the videos have finished playing (and you are at the main menu of the game), you can then plug the controller(s) in again and hopefully play successfully.
3. If the above two steps do not work, keep restarting the Xbox console until the video has played through. Once you have gotten the video to finish, you should be able to play without problems. If the problem persists, repeat these steps until you are able to play, or just return the game for a working one.
Note: In case the game experiences problems later during saving (around Mission 4 and higher) you should always maintain two or more saved game files in case one becomes corrupted.