<Li> OF - 4: Commander, frigate captain . </Li> <Li> OF - 5: Captain, ship - of - the - line captain, captain of sea and war . </Li> <P> Many naval rank systems ultimately derive from either British, French or Spanish naval usage . </P> <P> Generally speaking, naval ranks systems derived from French and Spanish usage use the names of different classes of ship (corvette, frigate, ship - of - the - line) in their rank titles . This is also the case in some other navies, e.g. two German naval ranks, those of "corvette captain" and "frigate captain". </P>

Naval officer between admiral and captain crossword clue