Midshipman and Midshipwoman were the official ranks of officer candidates of the Royal Manticoran Navy.

After completing their officer training at the Royal Manticoran Naval Academy on Saganami Island, the cadets became Midshipmen and were sent on their Midshipman cruises, active-duty field exercises aboard RMN starships. These 'middy cruises' were supervised by the Officers Candidate Training Officer, or OCTO.

Once a Midshipman had completed the middy cruise, he was evaluated by his superiors and, if he had done his job well, given an officer's commission with the rank of Ensign. (HH1, SI1)