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PURPLE and ENIGMA were not just cipher victories. Together they taught the American cryptologic system that modern signals intelligence required scale, machinery, disciplined analysis, deep liaison, and centralized direction. That lesson is part of the real prehistory of the NSA.
Strictly speaking, NSA did not yet exist when Chinese forces intervened in Korea in 1950. But later NSA histories repeatedly returned to the episode because it revealed one of the central problems of warning intelligence: collection can be substantial, even impressive, and still fail to prevent strategic surprise.
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.
American Cryptology During the Cold War, Volume One is one of the most important internal historical studies ever released about the early Cold War cryptologic state. This entry explains what the volume covers, why its emphasis on centralization matters, and how it helps readers understand the transition from wartime codebreaking institutions to the permanent architecture of NSA.