There are usually multiple offices of several ranks on board all but really small vessels. Even small creed like submarines have enough officers for they’re to be more than one of several ranks. The XO is a LCDR, as is the ENG. The other settlement heads are usually LT, although I did have a NAV that was a LCDR. The division officers are somewhere between O1 and O3. As for who’s in charge, there’s a chain of command The CO is at the top, the most junior is at the bottom. Two junior officers of equal rank both holding division officer billets it would depend on what the need for seniority is. If it’s due to a maintenance item that belongs to one of them, that’s the one with authority. If it’s something to do with the operation of the ship, if one of them is on watch as the OOD, that’s the one in charge. Of its an emergency like a fire, whoever got there first is in charge.
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