3. Admiral Lee Slaughter
https://www.youtube.com/watch?v=T5xHnVd-LhA It might seem odd for a land-locked community college to offer a one-week intensive sailing class without leaving campus, but why would Greendale let that stop them? Pierce convinces Shirley, Britta, and Troy to enroll in the class with him only for the instructor, Admiral Slaughter, to name Shirley as the ship's Captain instead of Pierce. Slaughter would talk them through imaginary scenarios as the crew attempted navigate the immobile ship in the campus parking lot. After Shirley defied her crew to decide to rescue the recently overboard Pierce, who was taking on water from a nearby fountain into a rowboat, Admiral Slaughter decided to promote her to Admiral and gave everyone an A. Slaughter was able to teach Pierce about the reality of failure while the rest of the seaman learned to stick together through the rough times. Troy most likely learned valuable lessons from Slaughter that helped him in an eventual circumnavigational journey around the globe with LeVar Burton.