What kind of federal agent was Phillip Sheppard on the TV show survivor?

Phillip Sheppard was a former "federal agent".

He claims he was a Special Agent with the former DIS (Defense Investigative Service) under the DoD (Dept of Defense) which is now the DSS (Defense Security Service). The DSS is NOT a Federal law enforcement organization and does not have police powers. The Special Agent (1811) position IS a sworn Federal law enforcement officer, however, those agents generally conduct background investigations for employees in the DoD/military. The DIS/DSS is not to be confused with the Diplomatic Security Service DSS in the State Dept, which does employ gun-toting/arrest-making Special Agents.