Officer

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.
==Commissioned==
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.
===Starfleet Ranks===
Lowest to Highest
* Ensign
* Lieutenant Junior Grade
* Lieutenant
* Lieutenant Commander
* Commander
* Captain
* Commodore
* Rear Admiral
* Vice Admiral
* Admiral
* Fleet Admiral
==Warrant Officer==
A warrant officer (WO) is an officer in a military organization who is designated an officer by a warrant, as distinguished from a commissioned officer who is designated an officer by a commission, and a non-commissioned officer who is designated an officer, often by virtue of seniority.
There are no ranks in Starfleet for this specific rank
==Other officer terms==
:Certain officer positions could be filled by non-commissioned officers and civilians if the need arose.
===By rank===
*Field officer
*Flag officer
*Ranking officer
*Provisional officer
*Non-commissioned officer
===By title===
*Senior officer (see also: senior staff)
*First officer
*Second officer
*Third officer
===By command structure===
*Commanding officer
*Executive officer
*Duty officer
===By department===
*Helm officer
*Navigator
*Operations officer
*Engineer
*Tactical officer
*Security officer
*Weapons officer
*Armory officer
*Intelligence officer
*Communications officer
*Medical officer
*Science officer
*Counselor
*Mess officer
===By function===
*Bridge officer
*Records officer
*Morale officer
*Liaison officer
**Convoy liaison officer
**Fleet liaison officer 
*Strategic operations officer
*Archaeology and anthropology officer
*Personnel officer
*Police officer
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