| Rank Class | Fleet Rank | Fleet Responsibilities | Marine Rank | Marine Responsibilities |
|---|---|---|---|---|
| O12 | Commander-in-Chief, Starfleet | Joint Chief of Staff for the Fleet, under the Secretary for the Star Fleet | Chief Marshal | Joint Chief of Staff for the Diplomatic Protection Group (DPG) |
| O11 | Fleet Admiral | Commands a Numbered Fleet (100-200 ships) consisting of several administratively-grouped sub-Fleets (War-time duty only)
Commands a branch of the Service (e.g. Bureau of Exploration, Bureau of Colonisation, Fleet Operations, etc.) |
Field Marshal | Commands a Theatre of War or Army Group |
| O10 | Admiral | Commands a Wing of a Numbered Fleet or large Task Force (25-50 ships)
Heads a Department within a branch of the service (e.g. SciFleet or TacFleet within Starfleet Operations) |
General | Commands a Field Army |
| O9 | Vice Admiral | Commands a major Sector and a Sub-Fleet (18-30 ships), headquartered at a starbase
Deputy Commander of a Department of Starfleet Command |
Lieutenant General | Commands an Army Corps |
| O8 | Rear Admiral | Commands a major Starbase or a Task Force of Capital Starships (5-20 ships) | Major General | Commands a Ground Division |
| O7 | Commodore | Commands a minor Starbase, a Squadron of Capital Starships (3-6 ships), or a Flotilla of Support Vessels (4-10 ships) | Brigadier General | Commands a Brigade Deputy commander of a Ground Divison |
| O6A | Fleet Captain | Commands a Squadron Element (1-3 ships) of capital starships Senior Captain in a Numbered Fleet |
Regimental Colonel | Senior Colonel in an Army Corps |
| O6 | Captain | Commands a capital starship Commands a Flotilla (3-6 ships) of escort starships |
Colonel | Commands a Regiment or Brigade |
| O5 | Commander | Commands an escort starship XO of capital starship |
Lieutenant Colonel | Commands a Battalion |
| O4 | Lieutenant Commander | Commands a patrol starship or spacecraft Heads major Department on a capital starship |
Major | Deputy commander of a Battalion |
| O3 | Lieutenant | Heads minor Department on a capital starship | Captain | Leads a Company |
| O2 | Lieutenant JG | Experienced working officer | First Lieutenant | Deputy commander of a Company Senior platoon leader |
| O1 | Ensign | Inexperienced working officer, recent graduate of military academy | Second Lieutenant | Commands a Platoon of 15-25 ground troops, recent graduate of military academy |
| O0 | Midshipman | Military academy student on a live training cruise | Cadet | Military academy student on a live training exercise |
| C4 | Cadet 1st-Class | Senior Student in final year at military academy | Cadet 1st-Class | Senior Student in final year at military academy |
| C3 | Cadet 2nd-Class | Junior Student in third year at military academy | Cadet 2nd-Class | Junior Student in third year at military academy |
| C2 | Cadet 3rd-Class | Sophomore Student in second year at military academy | Cadet 3rd-Class | Sophomore Student in second year at military academy |
| C1 | Cadet 4th-Class | Freshman Student in first year at military academy | Cadet 4th-Class | Freshman Student in first year at military academy |
| E9 | Master Chief Petty Officer | Senior enlisted man on a starship | Master Gunnery Segeant | Senior enlisted man in a Battalion |
| E8 | Senior Chief Petty Officer | Senior enlisted man in a starship Department | Master Sergeant | Senior enlisted man in a Company |
| E7 | Chief Petty Officer | Senior enlisted man in a starship Division | Gunnery Sergeant | Senior enlisted man in a Platoon |
| E6 | Petty Officer 1st-Class | Supervises a Duty Shift or group of 10 crew | Staff Sergeant | Supervises a group of 10 troops |
| E5 | Petty Officer 2nd-Class | Supervises a Division Section or group of 5 crew | Sergeant | Supervises a group of 5 troops |
| E4 | Petty Officer 3rd-Class | The lowest rank that supervises other personnel | Corporal | Junior sub-unit leader, an NCO at start of their career |
| E3 | Technician 1st-Class | Experienced crewman | Lance Corporal | Experienced marine |
| E2 | Technician 2nd-Class | Junior crewman | Private 1st-Class | Junior marine |
| E1 | Technician 3rd-Class | Crewman just completed basic training | Private | Marine just completed basic training |
| E0 | Recruit | Crewman just started basic training | Recruit | Marine just started basic training |
Last updated: 14:50 EST on 14th January 2007