- last post: 01.01.0001 12:00 AM PDT
I'm not sure this makes any sense at all. Do you mean being able to choose your model for campaign? Campaign is story-based, so you should use whoever the plot revolves around at the moment. Replacing the Chief, Arbiter, or Spartan with anything other than would be stupid.
[Edited on 11.14.2009 4:40 PM PST]