Tom Maguire brings to our attention the fact the  a U.S. intelligence agency (NSA) made a mistake leading  us into the Viet Nam war and  since has covered up their historian's findings on this since 2001. 
 
Even better, he reminds us that in the media's amicus brief in the Plame case, their lawyers argued:

While there is no suggestion that the Special Counsel is proceeding in bad faith, there should be abundant concern that the CIA may have initiated this investigation out of embarrassment over revelations of its own shortcomings.

Clarice Feldman   10 31 05