Re: does a starfleet ship always have a CO with the rank of captain?
Simpsons once made a joke about captains holding ranks other than Captain, where Homer referred to himself as a Colonel, then added he was the Captain of a rocket ship. Bart, totally confused asks "Are you a Captain or a Colonel?"
"Internet message boards aren't as funny today as they were ten years ago. I've stopped reading new posts." -The Simpsons 20th anniversary special.