Submitted by John
Glitch: 
Mission 6: 

Sink into hill:

It is possible to win the BadDog level (Mission 6, City Of The Forgotten) by sinking into a hill. Before you go up the stone staircase (where the little fire is burning), you will pass on the right hand side what appears to be doorways made of stone. These doorways on your right are all connected and lead nowhere. They appear to be there for game ambiance. The very last doorway has a small grass mound leading up into it (and a single shoot of a plant). You will notice that if you crouch (do 
not stand or lay down), you can move up to this grass hill and almost sink into it. 

Almost all of your body disappears until you can only see your hat. Once you have nudged up very close to this grassy hill, go to night-vision. Then, very slowly rotate your view to the left so that you start looking "into" the game (as if you are looking behind the scenes). When you are looking "into" the game graphics, go to the prone position. You are now crawling behind the scenes, out of enemy rea!

ch. Crawl forward to make sure it works (that your entire body is out of the regular game play and behind the scenes). Then, stand up. You can now walk around the entire game (until you get to the "sub-level" area) behind the scenes, killing everyone. Remember, your team is still out in the open as you walk up to the enemy and will get shot if you are not careful. Keep trying until you learn how to slink into that grassy hill in that last stone doorway. Note: This was done at the Lt. JG 
rank. Just nudge and glance in night-vision a few times before you sink in. By using this trick, you can sneak all the way up to BadDog and pick him off while he is standing there with his bodyguards. Information in this section was contributed by SOMMERKAMP.