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

The Coast Guard rating was renamed Telecommunications Specialist (TC) in 1995, which split in July 2003 to make up the Information System Technician (IT) and Operations Specialist (OS) ratings.

[2] The Radiomen of the US Navy were responsible for transmitting and receiving radio signals, and processing all forms of telecommunications through various transmission media aboard ships, aircraft and at shore facilities.

[3] This was done utilizing various frequencies in the ELF, VLF, LF, MF, HF, VHF, UHF, SHF and EHF spectrums.

Radiomen were also responsible for periodic maintenance of the communications equipment, to include transmitters, receivers and antennas.