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A non-commissioned officer (also known as NCO or noncom) was an enlisted member of Starfleet or another military or service organization who had not attended officer training, but functioned as a lower-ranking crewman with authority over other enlisted crewmen.
In Starfleet, anyone who was a petty officer (including specialists, yeomen, and technicians) was an NCO, as they were senior to the lower crewman rank. This included the more senior NCOs, such as chiefs.
- Non-commissioned ranks
- Master chief petty officer
- Senior chief petty officer
- Chief petty officer
- Petty officer
- first class
- second class
- third class