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Jacob Keyes was the commander of The Pillar Of Autumn, but he only appeared in HALO: Combat Evolved because he was taken over by the Flood, and Master Chief had to kill him before Flood Keyes could fly The Truth And Reconciliation (one of the Covenant's capital ships)off of HALO. After Master Chief killed Keyes, he went to the crash site of the Pillar Of Autumn and destroyed the ship, which then destroyed one of the seven rings of HALO, leading to HALO 2 which also lead to HALO 3.

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