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Thel Vadam was the commanding officer of the Fleet of Particular Justice which followed the Pillar of Autumn to Installation 04 during the Battle of Reach. This late in the war the Covenant could translate human text and the name Pillar of Autumn was written on the side of the ship.Probably because the names is on the side of the ship.he was on board the POA during its destruction.. he had intel

Plus, they probably hacked into the ship's communications in its final moments. Also, they captured Captain Keyes and he could have told them, but this is unlikely as he was a "tough-as-nails" soldier.

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