Yup, the initial report was incorrect. One Staff Sergeant, E6, one CW2, Warrant Officer, and one Captain, O3. The Staff Sergeant had some kind of title in that vehicle, indicating that he was somehow "in charge". I don't know how to explain that.
The Staff Sergeant was the "Crew Chief" whose job it is to do light maintenance; prepare the aircraft for flight and secure the aircraft after flight. In flight it's their job to secure cargo and passengers, assist pilots picking up loads plus any other assistance the pilots may need.
