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Vietnam was not a simple SIGINT success or failure. It was a paradox. The war generated enormous collection, constant demand, tactical value, major controversies, and repeated proof that good signals intelligence could still be blunted by politics, complexity, resource choices, and bad communications security.
Strictly speaking, NSA did not yet exist when the Korean War began. But later NSA histories treated the war as one of the decisive crises in American cryptologic history because it revealed how badly the postwar system had been weakened, how mixed the SIGINT record could be, and why AFSA was not enough.
Bad Aibling Station was one of the most important U.S. Cold War SIGINT sites in Europe. This entry traces its transformation from Army Security Agency field station to NSA-linked satellite listening post, its role in monitoring Soviet and Eastern Bloc communications, and its later place in the public ECHELON debate.