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An officer was a member of a group typically in the areas of the military, police, or some other form of authority. In a military service, an officer's typical role was to command and direct, maintain discipline, and make plans and provisions for operation. Certain organizations had special criteria in order for one to achieve the status of officer.


In a military service, a commission was an order from the service's supreme authority, such as its commander-in-chief, authorizing an individual to legally hold a military rank, with all the privileges and responsibilities of said rank. A commission usually appointed an individual to hold an officer's rank. (TNG: "Where No One Has Gone Before", "Ménage à Troi")

In times of conflict, a temporary commission could appoint an officer to command rank to replace an incapacitated or killed commanding officer. (TNG: "The Battle"; DS9: "Valiant", "The Siege of AR-558") Commander William T. Riker, for example, was granted a field commission promoting him to captain and given command of the USS Enterprise-D when the ship's commanding officer, Captain Jean-Luc Picard, was abducted and assimilated by the Borg during their first attempt to assimilate Earth. (TNG: "The Best of Both Worlds", "The Best of Both Worlds, Part II")

In situations where contact with Starfleet was not possible for very extended periods, a commanding officer had the authority to grant commissions to officers under his or her command, or revoke their existing commissions; that is, he/she had the authority to promote or demote his/her officers. (VOY: "Caretaker", "Parallax", "Thirty Days") Examples of this are when Captain Kathryn Janeway, commanding officer of the USS Voyager, promoted her chief tactical officer and security chief, Lieutenant Tuvok, to the higher rank of lieutenant commander, or when she demoted her flight controller, Lieutenant junior grade Tom Paris, to ensign. (VOY: "Revulsion", "Thirty Days") After a year of exemplary service, she reinstated him to his former rank. (VOY: "Unimatrix Zero")

Within the Takret Militia resigning a commission was not tolerated. In 2152, the three Takret Rellus Tagrim, Renth, and Guri requested shelter aboard Enterprise NX-01 to prevent their superiors finding them. (ENT: "The Catwalk")


Jean-Luc Picard, 2366

Jean-Luc Picard of the USS Enterprise-D with the rank of captain

In the Federation Starfleet, an officer or commissioned officer was an individual who had attended and graduated from the four-year cadet program of Starfleet Academy. (TNG: "The Drumhead"; DS9: "Starship Down", "Little Green Men", "Homefront", "Paradise Lost") Upon graduation from the Academy, the cadet was granted a commission appointing him or her to the rank of Ensign, or in exceptional circumstances Lieutenant junior grade. (TNG: "The Pegasus"; VOY: "Caretaker", "Non Sequitur"; DS9: "Favor the Bold", "Valiant", "What You Leave Behind") Trades such as Doctor or Counselor graduated as a Lieutenant junior grade as standard due to the extra time spent studying before graduating. (TNG: "Tin Man", "Conundrum", "Ethics")

Commissioned officers and enlisted officers were distinguished from other crewmembers through the use of a rank structure. (Star Trek: The Next Generation; Star Trek: Deep Space Nine)

Commissioned officer rank structureEdit

Starfleet ranks from lowest to highest:

  1. Ensign
  2. Lieutenant junior grade
  3. Lieutenant
  4. Lieutenant commander
  5. Commander
  6. Captain
  7. Fleet Captain
  8. Commodore (aka rear admiral lower half)
  9. Rear admiral (aka rear admiral upper half)
  10. Vice admiral
  11. Admiral
  12. Fleet admiral

Other officer termsEdit

Certain officer positions could be filled by non-commissioned officers and civilians if the need arose.

By rankEdit

By titleEdit

By command structureEdit

By departmentEdit


An engineering officer in Starfleet (2364)

By functionEdit

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