(covers information from several alternate timelines)
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.
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")
|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:||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
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mounted on a black field), which however had by 1944 become obsolete, the year in which "Storm Front" took place, superseded by new, April 1942 designs.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.