That sounds like dereliction of duty.
I meant in the sense that if a captain fights in a battle against a ship, he doesn't necessarily get assigned to all future diplomatic overtures towards or battles against that species in perpetuity. Or if he makes first contact with a species, he doesn't have to make every subsequent contact, though he can participate, advise, etc. Or if his general purpose ship discovers a new life form, a smaller science ship can pick up where he left off.