Can there possibly be two officers of the same rank serving on the same vessel? And if so who is in charge? (I.e two lieutenant junior grade officers on the same ship)
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Like most corporations, military bases/ships/posts are divided up into various departments. You might have the supply department, the medical department, operations, IT, food, etc. Each of those have senior leadership who oversee other officers, who themselves oversee even more people.
The hierarchy gets wider the further down you go, with individuals of the same rank often being responsible for very specific but different duties. The rank structure is pretty clear to those within it and having people of the same rank is rarely an issue unless one of them has a fragile baby ego.
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