The first ever gameplay footage was shown yesterday during Microsoft’s E3 Press Conference and it looks absolutely amazing.

In Halo 3: ODST, you play as The Rookie.  The Rookie is deployed into a mission, but becomes seperated from his teammates.  He goes out in search of his teammates, or at least what happened to them.  Along the way he’ll find artifacts that were left behind by his teammates, which will trigger a flashback and allow players to experience what happened first hand as they take control of one of The Rookie’s teammates.

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