The GWEN communication system, established in the late 1980s, was designed to transmit critical Emergency Action Messages (EAM) to United States nuclear forces. EMP can produce a sudden power surge over a widespread area that could overload unprotected electronic equipment and render. Aeronautical advisory stations, also called Unicom stations, are land stations used for advising pilots of private aircraft about local airport conditions. They are not used to control aircraft in flight. Aeronautical multicom stations provide communications between private aircraft and a ground. The SATCOM Base Station is designed for global, in-theater and on-the-move operations. All US Air Force, Army, Navy, Marines and Coast Guard Aircraft are supported. The net is staffed by Amateur Radio (Ham) volunteers who are members of MARS (Military Auxiliary Radio System). This order identifies four general requirements common to all A/G radio communications services as well as service specific requirements.
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