Re-doing his background a bit to have been a former Warden.  He "enlisted" as an Investigator 15 years ago and stayed in for 10, so he had a few chances to work with folks before getting out.  I see him as being the tough one of the non-Enforcers.  He wasn't a particularly good fighter, but he was most willing to risk contagious areas and take a beating from falls as well as monsters without much complaint or loss of competence.  He left due to dissatisfaction with governmental decisions.