Marine Corps veteran Brian Stann added another line to his impressive resume this month, as the Silver Star recipient, mixed martial arts champion, UFC and college football commentator, Hiring Heroes CEO and real-estate executive rejoined the cage-fighting club via the front office of the Professional Fighters League. Stann will serve as head of the fighters and competition/rules committee for the PFL, playing a key role in the organization’s plans to become a “fighters first” league, according to a news release. A PFL primer for non-MMA addicts: The group will kick off what amounts to a series of yearlong tournaments next month,…