The military of the Vulcan High Command maintained a rank structure roughly equivalent to that of the Starfleet. (ENT: "Broken Bow")
Administrator
Edit

Administrator V'Las in 2154
The administrator of the High Command had the power to authorize military action against foreign governments. (ENT: "Kir'Shara")
- Administrator V'Las
Fleet commander
Edit
Fleet commanders reported directly to the High Command. They oversaw and commanded fleet engagements. (ENT: "Kir'Shara")
Captain
Edit

A captain in 1957

Captain Oratt in 2152

A captain in 2369
Captain was the rank held by Vulcan starship commanders. (ENT: "Breaking the Ice")
Sub-commander
Edit

Sub-Commander Muroc in 2152
Sub-commander was a rank subordinate to a Vulcan captain. In dealing with Starfleet, a sub-commander was considered above the rank of commander and below the rank of captain. (ENT: "Broken Bow")
Major
Edit

Major Talok in 2154
Major was a rank held by senior Vulcan field agents. (ENT: "Kir'Shara")
- Major Talok
Subaltern
Edit
Subaltern was a rank that existed sometime before 2375. (VOY: "Infinite Regress")
- Subaltern Lorot
Sublieutenant
Edit

A sublieutenant in 2154
Sublieutenants were low-ranking members of the High Command, often manning security posts. (ENT: "Kir'Shara")
Rank insignia
Edit
Enlisted personnel | Commissioned officers | Generals and flag officers | ||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Fleet: | CRM | PO | CPO | MID CDT | 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: | Technician • Specialist • 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 |
Background information
Edit
The Vulcan rank system seems to have been similar to the system used by the Romulans, perhaps suggestive of a common origin. Vulcans and Romulans are the only species in Trek shown to hold the ranks of sub-commander and sublieutenant.
The ranks of commander and lieutenant have never been referenced on-screen, although their existence at some point in Vulcan history can be inferred by their subordinate ranks.