47 C.F.R. § 80.157
Radio officer defined
A radio officer means a person holding a First Class Radiotelegraph Operator's Certificate, Second Class Radiotelegraph Operator's Certificate, or Radiotelegraph Operator License issued by the Commission, who is employed to operate a ship radio station in compliance with Part II of Title III of the Communications Act. Such a person is also required to be licensed as a radio officer by the U.S. Coast Guard when employed to operate a ship radiotelegraph station.