ARMY SECURITY AGENCY
(ASA)

These are the major units that were directly supported by ASA Radio Research companies in Vietnam. 

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This chart reflects the reporting responsibilities of each Radio Research Company to larger units such as divisions, etc. in Vietnam.

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R390A VHF Receiver

This is one of the units that Morse Code Intercept Operators used to "listen to" and "copy messages" sent by the VC/NVA



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One Method of Radio Direction Finding

In addition to mounting receivers in the back of a jeep, receivers were also placed in airplanes.  This allowed for triangulation or getting a "fix" or location on the code sender.

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VC Sending a Message

"I hear you....I know what you are saying....stay up just a little bit longer and.....now my friends know where you are...... BOOM!"

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