I'm always curious why there's a recent trend to separate out Medical and Science, why not Engineering/Operations and Security--they seem a far more diverse set of skills.
I personally break the colours down into:
Red: Administration, Command, Diplomacy, Flight Control, Intelligence, Shuttle Control
Gold: Engineering, Operations, Security, Tactical
Teal: Communications, Counselling, Medical, Science
Based on RW assignments, if we're sticking with three colours I'd go for:
Red: Command, Diplomacy, Bridge (CONN, Ops/Comms, Tactical), Security/Intel, Flight Deck/Shuttle Pilot.
Gold: Engineering (inc Transporters/Holodecks/Replicators and Environmental), Ops/Comms
Technicians, Armory.
Teal/Cyan/Blue: Admin, Education, JAG, Science (including Comms - Linguistics), Medical (inc Nursing and Mental Health).
Yeah, the terminology can be confusing because there are "command" ensigns (or even acting ensigns) who are a long way from taking command of anything, and there are non-command officers like Scotty or Data who actually take command.
Agreed.
Four to five colours or at least insignia are required to fix this. The sections from TMP seem to be a good start (Command, Science, Medical, Engineering/Maintenance, Comms/Helm/Nav, Security and Services), but the "core" sections from the MM-style (Command, Engineering/Helm, Medical, Communications/Navigation/Science, Security, Services) are
mostly okay, but I'd tweak one or two.
That's why I said "control" would be a better name than "command." It seems that in Starfleet, like the US Navy, engineering is also a discipline and experience needed for a command role.
Most Commonwealth navies also require stints as both Engineering Officer of the Watch and (Bridge) Officer of the Watch as part of the Warfare pipeline, AFAICT.