Titles and Duties
Command
Commanding Officer Leadership and command of a crew or team in the direction of attaining a particular mission directive and the safety and well-being of officers under his/her command.
Executive Officer Acting as a conduit for relevant information to the commanding officer, ensuring the safety and security of the commanding officer, and advising the commanding officer in all instances.
Second Officer Acting as a conduit for relevant information to the commanding officer and the executive officer, advising both in all instances. In the absence of either the CO or XO, the second officer will ensure the safety and security and well-being of officers under his/her command.
Chief Tactical Officer Control of starship shields, weapons, and communication, with the secondary duties of starship security.
Flight Control Officer Course plotting, position verification, and supervision of manual and automatic flight operations. The flight control officer is also the primary bridge liaison to engineering.
Chief Communications Officer Monitoring and facilitating communications between crew members and contact with external parties.
Security
Chief Security Officer Security of the starship and its personnel is paramount. For this reason, the chief security officer is responsible for internal security. This can range from security for visiting diplomats to counterinsurgency.
Weapons Officer Maintaining weapons readiness and ensuring that weapons are at peak status. The weapons officer is also in charge of weapons development.
Master-At-Arms Supervisor of prisoners, including prisoner well-being, transport, and housing (brig). The Master-At-Arms often serves as liaison between the starship and the Office of the Judge Advocate General (JAG).
Engineering
Chief Engineer Monitoring, maintaining, and repairing starship systems.
Computer Specialist Chief expert on starship computer system, including maintenance and assisting crew members in the use of ship's computers.
Maintenance Technician Repair and good condition of starship and its systems, especially during and after battle.
Operations
Operations Manager Supervision of power allocation, coordination and scheduling of starship or unit resources, and assignment of away team personnel and equipment.
Transport Officer Movement of personnel and dignitaries on and off the starship, providing for their transportation. Maintenance and operation of shuttlecraft/shuttlebay and transporter systems.
Petty Officer Obtaining supplies and other necessities and luxuries as requested by personnel or visitors. Approval of supply requests.
Science
Chief Science Officer Control of starship or unit sensor arrays, coordination of scientific endeavors, and interpretation of sensor data.
Stellar Cartographer Manages and supervises the astrometrics laboratory, including intake and interpretation of all astronomical data.
Xenologist Chief expert on alien races, including alien biology and culture. Advises command staff in event of first contact.
Medical
Chief Medical Officer Prevention, diagnosis, and treatment of medical problems experienced by starship personnel.
Head Nurse Care and well-being of patients in sickbay, assisting the chief medical officer.
Counselor Diagnosis and treatment of psychological problems experienced by personnel. The counselor also advises command personnel.
Civilian
Federation Ambassador Represents the Federation of United Planets, interprets Federation by-laws, authorized to mediate disputes between aligned and non-aligned worlds. Drafts and approves contracts and treaties.
Captain's Yeoman Assists the commanding officer with personal affairs and day-to-day issues.
Recreation Manager Manages lounge, exercise facilities, holodecks, eating areas. Aids personnel in pursuing leisure activities.
Botanist Tends the arboretum, studies and reports on plantlife discovered by the crew during scientific endeavors.
Schoolteacher Tutors, oversees the education of all youngsters aboard the starship. Supervises the classroom program. With young Starfleet applicants, counsels applicants on pursuing and achieving entry into Starfleet Academy.

(Updated 8 April 2001)