radio communication operator
A person who operates radio communication equipment, often in maritime, aviation, or military contexts.
See also: 無線通信
He works as a radio communication operator on a ship.
無線通信 refers to the act or technology of radio communication, while 無線通信士 is the person who performs it.
Compound of 無線 (radio) + 通信 (communication) + 士 (person with a specific qualification or role).