Ranks of Col. Stuart's men?

I know it's an unimportant detail but I was wondering if there a copy of the script out there mentioning the ranks of Stuart's men. Obviously Cochran is a Sergeant, as revealed by the dossier Al pulls up. I figure Don Harvey's character, the second-in-command, is either a Lieutenant Colonel or a very senior Major. And the rest are probably all Captains, Lieutenants and NCOs.