|First sergeant insignia|
|Earth Two, 2266|
First sergeant was a military rank, a traditional infantry or army enlisted grade held by a non-commissioned officer. In comparison to naval rate systems, this rank was equivalent to senior chief petty officer.
First sergeant was, in title, the senior non-commissioned officer of a designated group of people with many other sergeants (possibly of the same grade) reporting to him/her. First sergeants were senior to all sergeants except for sergeant major (equivalent to MCPO), who was the first sergeant of first sergeants.
This was used by the United States of America in more than one branch of their armed forces, represented as a uniform insignia by a diamond-shaped "lozenge" insignia within the three sergeant chevrons – although the number of "rocker" insignia opposing may vary depending on the first sergeant's grade.
A US Marine Corps first sergeant was assigned to aircraft carrier USS Enterprise (CVN-65), one of the troops involved in the hunt for intruding time traveler Pavel Chekov in 1986. (Star Trek IV: The Voyage Home)
|Enlisted personnel||Commissioned officers||Generals and flag officers|
|ENS||LT JG||LT||LT CMDR||CMDR||CAPT||FCAPT||CDORE||RADM||VADM||ADM||FADM|
|2nd LT||1st LT||CAPT||MAJ||LT COL||COL||BRIG||MAJ GEN||LT GEN||GEN||MARSHAL|
|Positions:||Crewman • Technician • Chief||YMN||TAC • SO • 3rd • 2nd • 1st • CO • DD||Portmaster • Chief of Staff • CinC|
|Services:|| Andorian • Bajoran • Cardassian • Jem'Hadar • Klingon • Romulan • SS • Terran Empire Starfleet • Terran Empire MACO •|
United Earth MACO • United Earth/Federation Starfleet • United States • Vulcan