The National Security Agency drafted a “9/11 Retrospective” following the 2001 attacks, according to a document recently released by the National Archives.
Although an unclassified version of the Justice Department inspector general’s report into the FBI’s performance before 9/11 was published in full in 2006 and the executive summary of a parallel report by the CIA inspector general was released in 2007, this is the first known mention of any NSA review about its failings before the attacks.