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Radioman (RM) was a rating for United States Navy and United States Coast Guard enlisted personnel, specializing in communications technology.

The United States Navy occupational rating of data processing technician (abbreviated as DP) was a designation given by the Bureau of Naval Personnel (BUPERS) to enlisted members who satisfactorily completed initial data processing technician "A" school training.

On October 1, 1998, Sailors serving as Ocean System Technicians were merged into the Sonar Technician rating. us navy e7 ocean systems technician (ot) blue rating badge The fact that sound travels quite well under water—and faster than it does through the air—was one of the reasons that sonar (SOund Navigation And Ranging) was developed as a submarine detection device. On November 26, 1969, the Secretary of Navy approved the establishment of the Ocean Systems Technician rating (OT).

Aviation boatswain's mates operate, maintain, and perform organizational maintenance on catapults, arresting gear, barricades, and associated flightdeck launching and recovery equipment; operate and service aircraft ground-handling equipment and machinery; operate and service aircraft crash, firefighting, and rescue equipment; handle aircraft afloat and ashore; operate, maintain, and repair aviation fueling, defueling, lubricating oil, and inert gas systems; perform crash rescue, crash removal, and damage control duties.

On October 1, 1998, Sailors serving as Ocean System Technicians were merged into the Sonar Technician rating. us navy e7 ocean systems technician (ot) blue rating badge The fact that sound travels quite well under water—and faster than it does through the air—was one of the reasons that sonar (SOund Navigation And Ranging) was developed as a submarine detection device. On November 26, 1969, the Secretary of Navy approved the establishment of the Ocean Systems Technician rating (OT).

On October 1, 1998, Sailors serving as Ocean System Technicians were merged into the Sonar Technician rating. us navy e7 ocean systems technician (ot) blue rating badge The fact that sound travels quite well under water—and faster than it does through the air—was one of the reasons that sonar (SOund Navigation And Ranging) was developed as a submarine detection device. On November 26, 1969, the Secretary of Navy approved the establishment of the Ocean Systems Technician rating (OT).

On October 1, 1998, Sailors serving as Ocean System Technicians were merged into the Sonar Technician rating. us navy e7 ocean systems technician (ot) blue rating badge The fact that sound travels quite well under water—and faster than it does through the air—was one of the reasons that sonar (SOund Navigation And Ranging) was developed as a submarine detection device. On November 26, 1969, the Secretary of Navy approved the establishment of the Ocean Systems Technician rating (OT).

Aviation boatswain's mates operate, maintain, and perform organizational maintenance on catapults, arresting gear, barricades, and associated flightdeck launching and recovery equipment; operate and service aircraft ground-handling equipment and machinery; operate and service aircraft crash, firefighting, and rescue equipment; handle aircraft afloat and ashore; operate, maintain, and repair aviation fueling, defueling, lubricating oil, and inert gas systems; perform crash rescue, crash removal, and damage control duties.

On October 1, 1998, Sailors serving as Ocean System Technicians were merged into the Sonar Technician rating. us navy e7 ocean systems technician (ot) blue rating badge The fact that sound travels quite well under water—and faster than it does through the air—was one of the reasons that sonar (SOund Navigation And Ranging) was developed as a submarine detection device. On November 26, 1969, the Secretary of Navy approved the establishment of the Ocean Systems Technician rating (OT).