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Britain's Queen Elizabeth greets U.S. General David Petraeus, Commander of the NATO International Security Assistance Force and U.S. Forces Afghanistan, at Buckingham Palace, in central London March 22, 2011. REUTERS/Stefan Rousseau/Pool

David Petraeus

David Petraeus apologized on March 26 to an audience of veterans for the conduct that led to his resignation in 2012 as head of the CIA following the disclosure of an extramarital affair with his biographer, Paula Broadwell.