Chief tactical officer

Chief tactical officer was a senior position for Starfleet officers on board starships and starbases. Tactical officers were in charge of tactical operations, including weapons and shields, and ship's security.

This position was an evolution of the armory officer position assigned to Earth Starfleet ships in the 22nd century. (Star Trek: Enterprise)

On board starships in the early to mid 23rd century, the tactical officer did not have a bridge station, as weapons control was handled by the navigator or helmsman when needed, and security was handled by the ship's security officers. (Star Trek: The Original Series; Star Trek: The Animated Series). However, from the 2270s the tactical station was added to the Bridge, from which was controlled the photon torpedoes and deflector screens. ,

By the 24th century, tactical officers aboard starships were also typically charged with communications duties. (Star Trek: The Next Generation)

Chief tactical officers

 * Pavel Chekov (USS Enterprise NCC-1701 [refit] and NCC-1701-A)
 * Natasha Yar (USS Enterprise (NCC-1701-D))
 * Worf (USS Enterprise (NCC-1701-D) and USS Enterprise (NCC-1701-E))
 * Daniels (USS Enterprise (NCC-1701-E))
 * Tuvok (USS Voyager)