International radio operators picked up large numbers of coded Air Force communications being sent around the world on June 26 that indicated some type of military activity was about to take place.
A U.S. military official said the radio traffic was monitored from the Air Force Global High Frequency System (GHFS) that some observers regarded as "extraordinary" because of the unprecedented length of messages. They were sent to Air Force commanders at Andrews Air Force Base; Wideawake Airfield on Ascension Island; Elmendorf Air Force Base, Alaska; Andersen Air Force Base, Guam; Hickam Air Force Base, Hawaii; Lajes Field in the Azores; Offutt Air Force Base, Nebraska; Salinas Air Base, Puerto Rico; Thule Air Base, Greenland; and Yokota Air Base, Japan. All are sites of GHFS ground stations.
The messages appeared to be emergency action messages, coded communications sent by the Joint Chiefs of Staff to U.S. Air Force strategic nuclear forces.
The messages sent June 26 included 174 characters, much longer than normal 30-character messages, and amateur radio monitors say they have not seen the size of this message since the 1991 Persian Gulf War.
Air Force Maj. Tom Knowles, a U.S. Strategic Command spokesman, said there were no large-scale exercises going on that would account for what were likely "routine" messages.
"We routinely exercise that capability to make sure of the readiness of our forces," he said.
A retired Air Force general said the strategic nuclear forces also dispatch command action messages that are part of a nuclear command system that requires force commanders to respond within two minutes.
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