A security officer is an officer working for Starfleet Security, and is as such part of a starship or starbase's security department, under the command of a security chief.

A security officers's duties include the protection of Starfleet and Federation assets, the prevention and investigation of crimes, and personal protection of Starfleet officers and Federation or foreign dignitaries.

In the 23rd century, it was customary for landing parties to include a number of security officers as guards.

The Tactical Officer is an officer stationed at the console that controls a ship's weaponry and shields.

On Starfleet vessels, the tactical officer's job is to maintain weapon and shield readyness along with executing firing solutions. These solutions can range from a low intensity phaser beam or to plot a torpedo firing pattern.

Aboard Federation starships in the mid-23rd century, these duties were handled, at least to a large degree, by the helm officer and sometimes by the navigator.


Onboard the USS Pegasus Security and Tactical are two Seperate Departments
 

Known Officers in this Department:

Lieutenant Malcom Reed (Chief Security/Tactical Officer USS Enterprise NX-01)
Lieutenant Pavel Chekov (Chief Security Officer USS Enterprise NCC-1701 to NCC-1701-B)
(Officer USS Enterprise NCC-1701 to NCC-1701-B)
(Officer USS Enterprise NCC-1701-C)
Lieutenant Tasha Yar (Chief Security/Tactical Officer USS Enterprise NCC-1701-D)
Lieutenant Worf son of Mogh (Chief Security/Tactical Officer USS Enterprise NCC-1701-D&E)
(Constable) Odo (Chief Security Officer Deep Space Nine)
Lieutenant Commander Tuvok (Chief Security/Tactical Officer USS Voyager NCC-74656)