The New York Times is reporting new evidence has emerged about the Gulf of Tonkin incident in 1964 that precipitated the escalation of the Vietnam War. A National Security Agency historian has determined officers at the agency knowingly falsified intelligence in order to make it look as if North Vietnam had attacked U.S. destroyers in the Tonkin Gulf. Following the alleged attack, Johnson ordered retaliatory air strikes on North Vietnamese targets and used the event to persuade Congress to pass the Gulf of Tonkin resolution, which led to the escalation of the war. The NSA’s historian determined the intelligence may have been falsified not for political reasons but to cover up earlier mistakes made by intelligence officers. However, the Times reports there has also been a cover up of the historian’s account, which was first published in a classified in-house journal of the National Security Agency in 2001. The historian’s article remains classified. According to the Times, policymakers at the NSA feared the release of the historical study might prompt uncomfortable comparisons with the flawed intelligence used to justify the war in Iraq.