
FISINT (Foreign Instrumentation Signals INTelligence) is intelligence from the interception of foreign electromagnetic emissions associated with the testing and operational deployment of foreign aerospace, surface, and subsurface systems. Since it deals with signals that are not exchanged by humans, it is a subset of ELINT, which, in turn, is a su...
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http://en.wikipedia.org/wiki/FISINT

Foreign Instrumentation Signals Intelligence
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http://en.wikipedia.org/wiki/List_of_U.S._government_and_military_acronyms
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