Romulan Guard
- Overarching Romulan military structure (TNG: "Unification II")
- Divided into legions
- First Legion
- More commonly known as the Romulan Star Navy (TLE novel: Serpents Among the Ruins)
- Fifth Legion (ENT Novel: Kobayashi Maru)
- Military research and development (ENT Novel: Kobayashi Maru)
- General goals decided by commanding admiral, specific directions and implementation by chief technologist (ENT Novel: The Good That Men Do, Kobayashi Maru, Beneath the Raptor's Wing)
- First Legion
- Ranks
- Officers
- Officer training at Imperial War College (TNG: "Face of the Enemy")
- Ranking, highest to lowest:
- Admiral
- Admirality divided into echelons of seniority and prominence (ENT Novel: To Brave the Storm)
- Members of lower echelon known as khre'rior, often translated as "vice-admiral" (ENT Novel: To Brave the Storm)
- Commander (equivalent to Captain)
- Subcommander (equivalent to Commander)
- Centurion (equivalent to Lieutenant Commander)
- Subcenturion (ENT Novel: To Brave the Storm; TNG Short Story: "Turncoats")
- Lieutenant (equivalent to Lieutenant)
- Sublieutenant (equivalent to Ensign)
- Admiral
- Officers are usually expected to serve until retirement or death, but resignations are allowed
- Enlisted
- Highest to lowest:
- Decurion (equivalent-ish to Petty Officer)
- Uhlan (equivalent to Crewman) (ENT Novel: Beneath the Raptor's Wing, To Brave the Storm)
- Plural: uhlanu
- Highest to lowest:
- Officers
- Uniform
- As of mid-22nd century, enlisted field operatives wear orange fatigues (ENT Novel: Beneath the Raptor's Wing)
- Notes
- Classified directives delivered in deep-green PADDs (ENT Novel: Beneath the Raptor's Wing)