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

Administrator

Administrator V'Las in 2154

The administrator of the High Command had the power to authorize military action against foreign governments. (ENT: "Kir'Shara")


Fleet commander

Fleet commanders reported directly to the High Command. They oversaw and commanded fleet engagements. (ENT: "Kir'Shara")

Captain

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

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

Major Talok in 2154

Major was a rank held by senior Vulcan field agents. (ENT: "Kir'Shara")


Subaltern

Subaltern was a rank that existed sometime before 2375. (VOY: "Infinite Regress")

Sublieutenant

A sublieutenant in 2154

Sublieutenants were low-ranking members of the High Command, often manning security posts. (ENT: "Kir'Shara")

Rank insignia

Sublieutenants do not appear to have worn rank insignia.
This chart shows only general equivalencies based on the ranks used by many governments on Earth, as well as the rest of the galaxy.

Background information

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.

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