(covers information from several alternate timelines)
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Brigadier was a military officer's rank, the equivalent of which was used by the service organizations of many civilizations. As a traditional grade, brigadier (also known as brigadier general) was the most junior flag officer rank, or the most senior field officer rank, of a fighting organization; by definition it was the officer in charge of a brigade. In comparison to naval ranking systems, this rank was equivalent to the naval commodore (or rear admiral lower half) ranks.
This grade existed in some form in many other cultures' rank arrangements, such as the Klingon Defense Force. (Star Trek VI: The Undiscovered Country)
In an alternate World War II-era on Earth, the German Wehrmacht army brigadier general equivalent, called Generalmajor in German, wore an insignia of gold shoulder knots. (ENT: "Storm Front")
On the planet Ekos, there were two equivalent ranks carried by the Ekosian SS in 2268; One was SS-Oberführer, and the other was the slightly higher SS-Brigadeführer. The historical Earth Wehrmacht too, had a counterpart on Ekos, along with its brigadier general, the Generalmajor. (TOS: "Patterns of Force")
Noted brigadiers
- Ekosian
- Human
- Klingon
- Brigadier Kerla (Klingon Defense Force)
Enlisted personnel | Commissioned officers | Generals and flag officers | ||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Fleet: | CRM | PO | CPO | MID CDT OC |
ENS | LT JG | LT | LT CMDR | CMDR | CAPT | FCAPT | CDORE | RADM | VADM | ADM | FADM | ||||
Military: | PVT AMN |
CPL | SGT | SSGT | MSGT 1SGT |
2nd LT | 1st LT | CAPT | MAJ | LT COL | COL | BRIG | MAJ GEN | LT GEN | GEN | MARSHAL | ||||
Positions: | Boatswain • Chief • Corpsman • Engineer's mate • Specialist • Technician • Yeoman | TAC • SO • 3rd • 2nd • 1st • CO • DD | Portmaster • Chief of Staff • CinC | |||||||||||||||||
Services: | Andorian • Bajoran • Cardassian • Ferengi • Jem'Hadar • Klingon • Romulan • SS • United Earth MACO • United Earth/Federation Starfleet • United States • Vulcan Mirror universe: Terran Empire Starfleet • Terran Empire MACO |
Appendices
Background information

Brigadier general insignia in the 1940s USAAF
Based on the three star insignia used by Lieutenant General Denning in the United States Army Air Forces in the 1940s, a brigadier general would wear one star.
The SS Ekosian Oberführer – equaling the British brigadier rank – and Brigadeführer – comparable to the US brigadier general rank – were wearing older versions of their insignia (though historically, the brigadier should have had his insignia mounted on a black field), which however had by 1944 become obsolete, the year in which "Storm Front" took place, superseded by new, April 1942 designs.
According to the Star Trek Encyclopedia (4th ed., vol. 2, p. 9), brigadier general 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.