I'd like to use this post to dispel another myth that people seem to be flinging around constantly on this forum: That spartan's in the original trilogy couldn't run (I shouldn't even have to entertain this because canon doesn't matter in competitive MP). In the original Halo games (the good ones without sprint) the spartan would be jogging if you pushed the stick right forward, and they would walk forward if you put less pressure on it. In these games, your spartan could actually run and shoot at the same time because he was an actual super soldier, if you care so much about canon you could say he was reserving energy for upcoming battles by jogging instead of sprinting. So this still makes sense in canon without compromising gameplay.