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The historian's conclusion is the first serious accusation that communications intercepted by the N.S.A., the secretive eavesdropping and code-breaking agency, were falsified so that they made it look as if North Vietnam had attacked American destroyers on Aug. 4, 1964, two days after a previous clash. President Lyndon B. Johnson cited the supposed attack to persuade Congress to authorize broad military action in Vietnam, but most historians have concluded in recent years that there was no second attack.
The N.S.A. historian, Robert J. Hanyok, found a pattern of translation mistakes that went uncorrected, altered intercept times and selective citation of intelligence that persuaded him that midlevel agency officers had deliberately skewed the evidence.
Mr. Hanyok's findings were published nearly five years ago in a classified in-house journal, and starting in 2002 he and other government historians argued that it should be made public. But their effort was rebuffed by higher-level agency policymakers, who by the next year were fearful that it might prompt uncomfortable comparisons with the flawed intelligence used to justify the war in Iraq, according to an intelligence official familiar with some internal discussions of the matter.
Both men said Mr. Hanyok believed the initial misinterpretation of North Vietnamese intercepts was probably an honest mistake. But after months of detective work in N.S.A.'s archives, he concluded that midlevel agency officials discovered the error almost immediately but covered it up and doctored documents so that they appeared to provide evidence of an attack.
Originally posted by Nygdan
There is also an atsnn article on this:
NSA Study From 2001 Might Show Tonkin Resolution Falsified