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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that may be true BUT you are forgetting all that is left is the core which if i am not mistaken is in slip-space. making it UN-accessible to anything floating around. now i am fully aware rocks and other space debris can get into slip-space making chief's ride possible to do so as well but if you look at the back ground in the trailer you will see normal stars.