Starfleet Tactical are responsible for the protection of their posting against external attack, as well as the protection of all persons on their posting. They work closely with Security but work more on the offensive side of things than the defensive. They are highly skilled in both space and ground combat, and their expertise can range from training people in combat skills to even analysing how multiple ships should proceed in warfare scenarios.
Armory Officers are responsible for the armory and its contents. They work very closely with Masters at Arms to make sure all weaponry is available should it be needed.
A Combat Analyst or Strategist is highly trained in the art of combat, and specializes in observing the enemy, determining the next move, and planning out tactical operations.
An Explosives Specialist is a highly trained officer who is responsible for explosives, be that disarming them or placing them, e.g. breach charges.
A Field Tactics Instructor specializes in teaching officers field tactics, including survival, strategy, and combat.
A Field Tactician is specialized in using field tactics, such as during away missions on planets and moons. They are highly skilled in performing tactical operations.
Flight Squadron Pilots are highly skilled pilots that operate fighters rather than shuttles.
A Hand-to-Hand Combat Instructor specializes in teaching officers so they may better defend themselves in both unarmed and close-quarters scenarios.
A Phaser Specialist has advanced training and knowledge of phasers, and is highly skilled in their ability to use one. They are frequently sharp shooters, capable of hitting a target at long range if needed.
Space Tacticians, similar to Field Tacticians, specialize in using tactics in non-atmospheric, low or zero gravity environments.
Torpedo Specialists are responsible for maintaining torpedoes, as well as loading and operating torpedo tubes. They are also highly knowledgeable in how to disarm them.