Page "Johnston Atoll" Paragraph 31

The central means of transportation to this island was the airport, which had a paved military runway.

The islands were wired with 13 outgoing and 10 incoming commercial telephone lines, a 60-channel submarine cable, 22 DSN circuits by satellite, an Autodin with standard remote terminal, a digital telephone switch, the Military Affiliated Radio System ( MARS station ), a UHF / VHF air-ground radio, and a link to the Pacific Consolidated Telecommunications Network ( PCTN ) satellite.

Amateur radio operators occasionally transmitted from the island, using the KH3 callsign prefix.