I seriously believe the enemy is mainly going to be ONI aka Office on Naval Intelligence.Because they are known to set up at installations like these and known to sacrifice UNSC personnel.Think about it.It definitely shows in the books,games,and minifilms from waypoint.
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Proof? Yes I may make myself look like an idiot when you prove it, but for right now I'd like some proof where it says it landed before the Covies existed.