David Petraeus

Associated Press
FILE - This July 22, 2012, file photo shows U.S.  Gen. John Allen, top commander of the NATO-led International Security Assistance Forces (ISAF) and U.S. forces in Afghanistan, during an interview with The Associated Press in Kabul, Afghanistan. The Pentagon says Gen. John Allen is under investigation for alleged "inappropriate communications" with Jill Kelley, the woman who is said to have received threatening emails from Paula Broadwell, the woman with whom former CIA Director David Petraeus had an extramarital affair. Defense Secretary Leon Panetta says the FBI referred the matter to the Pentagon on Sunday, Nov. 11, 2012. Panetta says he ordered a Pentagon investigation of Allen on Monday. (AP Photo/Musadeq Sadeq, File)

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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.

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