Emergency Action Message

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An Emergency Action Message ( EAM ) is an encrypted short message sent via the High Frequency Global Communications System with which the armed forces of the United States order the use of nuclear weapons ordered by the National Command Authority .

Web links

Emergency Action Procedures of the Joint Chiefs of Staff, Nuclear Control Orders (U), EAP-JCS Volume V (PDF, English; 424 kB)
Example of an EAM radio transmission on youtube.com