Tactical is spread throughout my 3x classes as fighting Person vs Person, Fighter Craft vs Fighter Craft, & Ship vs Ship requires different specialities.Not bad, I'd suggest a slight change, based on both current practice and elements from Enterprise and TOS:
Tactical: Includes both "combat troops" (who double as security officers) and command officers (Bridge Duty Officers* [take command if needed, can operate any console], [most] Executive Officers, Commanding Officers). General authority over all three branches.
Operations: All personnel needed for the running of the ship - engineers, armory (weapons maintenance), communications/data systems, non-CTP trained pilots. NB: Normally exercise authority only within their own branch, but may take additional training to allow "dual-hatting" (ie Chief Engineer also acting as First or Second Officer)
Support: Most personnel needing to support the crew and the mission - medical, research and development, logistics, legal/PR/admin, construction, training. NB: Normally exercise authority only within their own branch (including command of specialist ships/bases), but specific and limited case-by-case exceptions are allowed (usually medical or JAG officers).
*Worf (and to alesser extent LaForge) during S1 would be close to what I am thinking here, though I'd expect a Galaxy-class to have full lieutenants or even lieutenant commanders filling these billets.
Ops & Support are built within CrewFolk.
CrewFolk is probably the largest division with the most options to learn from since it's not heavily Combat focused like Soldier & Aviator. CrewFolk include other options besides just Combat.