That's probably a joke, but my question is serious.
I've noticed that several countries have two grades of lieutenant and a grade of captain, or an ensign, a lieutenant, a captain grade. Others have three lieutenants and a captain, an ensign, two lieutenants, and a captain grade, or two lieutenant and two captain grades. I could have sworn I saw the one ensign, three lieutenant, and two captain grades in the same military, but I'm not sure ...
Anyhow, the question is why?
Most of these were from the American continent, but there are European examples as well, so I don't think it's the size of the military or whether they are a conscript or professional one. I could kinda see one extra one as a promoted-from-the-ranks or just-commissioned designator, so is that it? Some militaries get away with just two (Spanish Army and British Navy,) so I'm curious why add more?