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Maybe way off target...
Seems like Bungie has been putting a lot of effort into this ARG, and maybe they've had it planned for a while. Which makes me wonder if there are other clues in older material that predate the Circuit City ad. As a for instance, wasn't there a Spartan in the DOA game at 360 launch? Anybody know of any other Bungie sanctioned earlier appearaences that might be clues?