UniversalStarfleet

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Non-commissioned officers
The enlisted section of Starfleet had a hierarchy of "noncoms," short for non-commissioned officers.
These ranks were achieved by members of Starfleet who had not attended Starfleet Academy.
Petty Officers:
Master chief petty officer

Senior chief petty officer
Also known as "senior chief specialist".

Chief petty officer

Petty officer first class
Also known as "technician first class", etc.

Petty officer second class
Also known as "specialist second class", etc.

Petty officer third class
Also known as "yeoman third class", etc.

Crewman:
Crewman first class

Crewman second class

Crewman third class

The lowest possible rank of Recruit, rated below the Crewman grades, had no insignia.