I was just wondering if you all had made a point of noting it is Dr Halsey, not Cortana, speaking at the beginning about Master Chief. They virtually have the same voice since they are the same person.. but still. I just think it adds a whole new layer of intrigue if you imagine Dr Halsey sitting away somewhere reciting those lines.
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That's Cortana. You hear Dr. Halsey's voice at the level "Cortana" when you are at the part were the cortana terminal is.