The image you'll find in here is taken from the CG in the brand new Halo 3 TV ad, airing on ESPN's Monday Night Football next week. Be sure to check it out and set up that Tivo. This is one you won't want to miss. Also, there is some football game playing that night. Apparently.
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Something I just though of, in Halo 3 you should be able to collect the dog tags from dead marines. Not the ones killed in combat with you, the ones that come dead with the level. Once you have the dog tag, it should unlock a cinematic about what happened before you arrived. It would add more depth to the game, and add to the back story. Through this way, people that only want to see the main game don't have to be bored with extra, possibly seemingly pointless, cinematic's, while the fans that want a larger insight into the game's back story could discover exactly what happened in each area, and what preceded them.