Staff sergeant was a military rank, a traditional infantry or army enlisted grade held by a non-commissioned officer.
A security police staff sergeant was accidentally beamed aboard the USS Enterprise during a time travel mission in 1969. (TOS: "Tomorrow is Yesterday")
The equivalent SS-rank on Earth and Ekos was oberscharführer. (TOS: "Patterns of Force"; VOY: "The Killing Game, Part II")
According to the Star Trek Encyclopedia, 4th ed., vol. 2, p. 9, staff sergeant was a rank in the Military Assault Command Operations in the 2150s. The insignia for this rank was on display in a diagram of MACO rank and insignia.
| Enlisted personnel | Commissioned officers | Flag officers | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fleet: | CRM | PO | CPO | MID CDT OC WO |
ENS | LT JG | LT | LT CMDR | CMDR | CAPT | FCAPT | CDORE | RADM | VADM | ADM | FADM | ||||
| Military: | PVT AMN |
CPL LCP |
SGT | SSGT | MSGT 1SGT |
2nd LT | 1st LT | CAPT | MAJ | LT COL | COL | BRIG | MAJ GEN | LT GEN | GEN | MARSHAL | ||||
| Services: | Andorian • Bajoran • Cardassian • Ferengi • Human (CSA • Third Reich • UE MACO • USA) • Jem'Hadar • Klingon • Romulan • United Earth/Federation Starfleet • Vulcan Mirror universe: Terran Empire Starfleet • Terran Empire MACO | |||||||||||||||||||
This chart shows only general equivalencies based on the ranks used by many governments on Earth, as well as the rest of the galaxy.