For other definitions of "security officer", see Security officer (disambiguation).

A Starfleet unit's Chief Security Officer, Chief of Security, Security Chief, or Security Officer, was charged with keeping order aboard ship or station as pertaining to the investigation of violations of Starfleet regulations, altercations between crew members, and incarceration of any individual ordered into the brig by senior officers.

Duties and Functions

The chief security officer worked closely with the first officer in arranging and conducting any courts-martial held aboard ship. The security chief also maintained the security force and drilled them, along with the rest of the crew, in such eventualities as enemy infiltration. The chief of security was also responsible for the maintenance, distribution, and control of personnel weapons, such as hand phasers, and was expected to maintain proficiency in the use of each kind.


Because of the multitude of responsibilities involved, the security chief always held the tank of full lieutenant or above.

Known Chief Security Officers

External Links