Quote Originally Posted by Freelancer View Post
As for the trailer and the jetpack, I was always under the assumption that the Spartan II's had some kind of built in zero-g maneuvering thrusters in their suits. It would make sense that they were located on the backpack since the suit power-core is there as well. We've never really seen the chief operate in a zero-g environment so I assume that may be the explanation.

Remember, it may not be a full on jetpack that can lift a super soldier in MJOLNIR armor off the ground in-atmosphere.
It's about time someone mentioned the obvious.
I mean the first time the Spartans encountered the Covenant in their suits they did make a jump onto a covenant hull in space it would only make sense for later revisions to have integrated stabilizers.

As for the ancient threat, The Flood is the only thing coming to my mind right now.
The forerunner died so unless it's some kind of automated system aka Onyx sentinels I doubt we would have too much trouble with them.