CALL OF DUTY MODERN WARFARE 2
Veteran Glitch
This is a glitch to complete Veteran on Recruit setting. Please read the article about this here.
You will need two separate save locations e.g. A Hard Drive and a Memory Unit. When Modern Warfare 2 saves the game, it only saves the last checkpoint, and the difficulty is saved on your profile. To make this work, you will need to complete only the last checkpoint on Veteran, which are short and easy. This is very similar to the Bourne Conspiracy Assassin Cheat.
Here's how to do it
STEP 1
Play the level on Recruit (Easy) until the last checkpoint, and then save and quit.
STEP 2
Change the storage device . Go to Menu > Options > Select Save Device and restart the level on Veteran, then save and quit.
STEP 3
Go back to the original storage device and continue the last checkpoint on Veteran.
There you go. Remember I am only giving this out for informational purposes so it is entirely up to the individual should they wish to cheat on Veteran.
Credit goes to kero's forum post about this glitch at Xbox360achievements.org.