NYT: Vietnam Study, Casting Doubts, Remains Secret (Tonkin intel errors)

WASHINGTON, Oct. 28 - The National Security Agency has kept secret since 2001 a finding by an agency historian that during the Tonkin Gulf episode, which helped precipitate the Vietnam War, N.S.A. officers deliberately distorted critical intelligence to cover up their mistakes, two people familiar with the historian's work say.

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 concluded that they had done it not out of any political motive but to cover up earlier errors, and that top N.S.A. and defense officials and Johnson neither knew about nor condoned the deception.

http://www.nytimes.com/2005/10/31/politics/31war.html

Article Raises Questions About Vietnam War

Rather than correct the mistakes, the 2001 article in the NSA's classified Cryptologic Quarterly says, midlevel officials decided to falsify documents to cover up the errors, according to Aid, who is working on a history of the agency and has talked to a number of current and former government officials about this chapter of American history.

Aid draws comparisons to more recent intelligence on Iraq's weapons of mass destruction that overstated the threat posed by Saddam Hussein's arsenal.

"The question becomes, why not release this?" Aid said of the article. "We have some documents that, from my perspective, I think would be very instructive to the public and the intelligence community ... on a mistake made 41 years ago that was just as bad as the WMD debacle."

http://www.washingtonpost.com/wp-dyn/content/article/2005/10/31/AR2005103101087.html