The problem with navy comparisons is that what Uhura is shown doing most of the time would be done by an enlisted seaman or petty officer. The officers in the Communications Department (or Divisions) would be managing those people and activities, hands off the equipment. But again FWIW, on a 1960s USN cruiser, CR division (or OR if Communications had been brought under the Operations Department) would be Radiomen, operating the radio equipment, sending, receiving and processing the message traffic. OE division in Ops would be the Electronics Technicians who maintained and repaired everything.