During the mid-23rd century Constitution-class starships the tactical station was operated from the navigation and helm and worked in conjunction with the phaser control room located elsewhere on the ship. (TOS: "The Corbomite Maneuver" ) Some Galaxy-class starships secure phasers at the tactical station for security personnel use. (TNG: "Ship in a Bottle" ) Defiant-class starships have two tactical stations, on opposite sides of the bridge. (DS9: "Defiant")