Everyone can do everything, Divisions is just to show what your main interests are basically obviously each divison has important jobs to do, T&I are in charge of making money for the fleet, salvage metals and gather ore for weapons and ships and collecting gas from gas-giants for fuel refinery. exploration would be in charge of mapping jump points exploring the galaxy and fine optimal trade routes and astroid fields for T&I etc and combat ops is our main military force but exploration and T&I can join the fight whenever they feel like it, and vise-versa for combat ops in regards