IMO the story suffered a bit when the Chief never once removed his helmet, even though everyone else in the room did. 343 went a long way in humanizing him, which made it even more silly that he never once showed his face.
If Chief eventually dies in a future game I want the final scene to be the removal of the helmet to reveal...he's actually a she... and a really butch looking woman. John is actually shortened from Johanne. Yeah.