I know that a lot of people are uncomfortable with the Vietnam-Iraq comparisons, but this is uncanny:

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.
  ...
"Rather than come clean about their mistake, they helped launch the United States into a bloody war that would last for 10 years," [historian Matthew] Aid said.
  ...
Robert S. McNamara, who as defense secretary played a central role in the Tonkin Gulf affair, said in an interview last week that he believed the intelligence reports had played a decisive role in the war's expansion. "I think it's wrong to believe that Johnson wanted war," Mr. McNamara said. "But we thought we had evidence that North Vietnam was escalating."

Like I said: uncanny.