Hi guys I've done some digging and I may have found some more info on Halo 3's campaign.
Firstly the first level takes place at seira-117(wherever that is)
Grunts are more vicious and dangerous and so are the brutes
Secondly the pelican has a more active role as you man the turret in missions.
Finally there May be spartans after all as A magazine has said they played it and it sound like they are spartanIII's
Vigil is watching you
Halo: The Unlatched Casket- The horror is released........