I was thinking, why would bungie make a game with a story we already know? Yes, this has been confirmed a "Prequel", but that doesn't really mean its the same story as the Fall of Reach. Is it not possible that this is the same reach, just a few years after the fall? Like, a salvage mission to save any civilians who were stranded in the city? Or all the important ONI personel who were left in the Castle thing?