|Higher Rank:||Petty Officer Third Class|
|Lower Rank:||Crewman Apprentice|
|Known Crewman||Known Crewman|
|[ Source ]|
Crewman (Abbreviated to CN) is an enlisted Starfleet rate generally reserved for personnel with between two and four years of experience. Crewmen generally serve as medical technicians or engineering technicians. Promotion to Petty Officer Third Class upon re-enlistment is common, but not guaranteed.