Pfft. Show's how out of contact I've been with Bungie. I had to go look these guys up to get any clue as to who they were. Probably doesn't help I've never owned an Xbox or any of it's later versions, and all I really knew by them was Halo. xp
Well, there's a Story Page with all of the terminals (the games' primary method of story conveyance) that might be useful! I can try and answer questions you might still have after reading through that.