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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yes that is EXACTLY what i am suggesting. ill admit it is plausible but the remnants of onyx are in slip-space. and chief is not in slip-space.