Rather than having 3 separate units of Tactical Bombers/Naval Bombers/Strategic Bombers can I suggest you just have one unit of bombers. You supply the types of aircraft into that unit so you could change the abilities of the bomber unit by adding or removing aircraft in the unit inventory.
The same logic would apply to combining Interceptors/Fighters/Close Air Support into one unit. By adding or removing aircraft you would defacto change its abilities.
The same logic would apply to combining Interceptors/Fighters/Close Air Support into one unit. By adding or removing aircraft you would defacto change its abilities.