sentences:  Once assigned to a ship or shore station, the radarman was required to operate and maintain the installed radar and electronic warfare equipment.Radarmen were specially trained in emergency repair procedures, as their assigned vessels went into combat areas.The Radarman (RD) rating was changed to Operations Specialist (OS) in October 1972, with its operational duties assigned to the OS rating, electronic warfare operation and maintenance to the Electronic Warfare Technician (EW), and its radar maintenance duties to the Electronics Technician (ET) rating.