Officers candidate
An officers candidate was a generally a civilian – already possessing a higher education – or a non-commissioned officer who trained to earn a commission, as an officer in the military, without being required to attending a service academy. An officers candidate was similar to what a midshipman was to a cadet.

Prior to joining the crew of  in 2371, Crewman Frank Darwin was recommended by his training instructor as an officers candidate. Darwin, however, turned down the opportunity in favor of his desire to get out into space. ()

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Military ranks
Education occupations