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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and plus MC does not even know of their existence because he is fighting other places (i.e. halo 2), so why would he have a dream/flashback about them?