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Kind: Article Credibility: highly credible Tag: Army Security Agency

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NSA in Vietnam War Signals Intelligence

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.

Declassified / Nsa/historical record/2026-03-31

NSA Vietnam War SIGINT COMINT ELINT Gulf of Tonkin

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NSA and the Korean War SIGINT Crisis

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.

Declassified / Nsa/historical record/2026-03-30

NSA AFSA Korean War SIGINT COMINT warning failure