I want to say three, but I haven't read the Fall of Reach. This is truly a Heroic difficulty question.
English
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You are incorrect, but close
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Was it four?
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Yes Red Team was split up into Team Alpha, Team Beta, Team Gamma, and Team Delta
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Alright, thanks. I have yet to delve into the books, but have limited knowledge on the Halo lore. I'll have to ask for game questions to be safe.