Starfleet Tactical

Starfleet Tactical is a division of Starfleet that is responsible for the designing, planning, and implementation of both offensive weaponry and defensive measures aboard Starfleet vessels and facilities.

Starfleet Tactical faced their biggest challenge in 2365, following the USS Enterprise-D's encounter with the Borg in System J-25. It had been proven that current Starfleet weaponry were ineffective against the Borg, so many new weapons and starship designs were initiated by Starfleet Tactical including the Defiant and Prometheus classes and weapons such as the quantum torpedo. (TNG episodes: "The Best of Both Worlds").