[Kevin]

With Sigma Nu (or at least the way my chapter handles it), a chapter is run sort of like a corporation. Due to the VMI roots of the Fraternity, all officer names are military in origin.

Commander = CEO
Lieutenant Commander = COO
Treasurer = CFO
Recorder = Secretary, in charge of record keeping and communication
Marshal = In charge of new member education
Recruitment Chair
Chaplain

Below this you have your people like social chair, etc. One notable difference in my chapter, we have a "Charm" Chair who's job it is to ensure that everyone practices good ettiquette in public. Other than that, we have about the same chairs as any other fraternity.