And by the way, I was referring to it in the sense of a “frocking”, not in the sense of an actual position as the Captain of a vessel.
I had thought that a LCDR in command of a vessel was referred to as “Commander” when being introduced or addressed by other officers in his role and not differentiating between LCDR and CDR. I don’t think it would be the same for a LT who was in charge of a boat.
umm, see above