Former CIA director and retired Gen. David Petraeus during his address Tuesday at the University of Southern California. Frederic J. Brown /AFP/Getty Images hide caption

Marine Gen. John Allen. Alex Wong/Getty Images hide caption

Jill Kelley outside her home in Tampa last November. Tim Boyles/Getty Images hide caption

Paula Broadwell in July 2011. ISAF/Reuters /Landov hide caption

Senate Select Committee on Intelligence chairwoman Sen. Dianne Feinstein, D-Calif. Alex Wong/Getty Images hide caption

Sept. 11: The U.S. consulate in Benghazi, Libya, was aflame after coming under attack. AFP/Getty Images hide caption

Then-Army Gen. David Petraeus (left) and Marine Corps Gen. John Allen in August, 2011. Chip Somodevilla/Getty Images hide caption

David Petraeus, then-CIA director, testifies before the Senate Intelligence Committee in January. Petraeus resigned Friday after acknowledging an extramarital affair. Karen Bleier/AFP/Getty Images hide caption

Then-Gen. David Petraeus in mid-2011, just before he became CIA director. Barbara Sax/AFP/Getty Images hide caption

Paula Broadwell in July 2011. ISAF/Reuters /Landov hide caption

David Petraeus, while he was the top commander of U.S. and coalition forces in Afghanistan, and Paula Broadwell in July 2011. He resigned from his post as CIA director because of an extramarital affair they had. ISAF/Reuters /Landov hide caption

Former Central Intelligence Agency Director, David Petraeus, in Sept. 2011. Mark Wilson/Getty Images hide caption