** FILE ** A photo from July 13, 2011, made available on the International Security Assistance Force's Flickr website shows the former Commander of International Security Assistance Force and U.S. Forces-Afghanistan Gen. Davis Petraeus (left) shaking hands with Paula Broadwell, co-author of "All In: The Education of General David Petraeus." (Associated Press/ISAF)
U.S. Secretary of Defense Chuck Hagel (left) meets with Afghan Interior Minister Ghulam Mujtaba Patang at the International Security Assistance Force headquarters in Kabul, Afghanistan, on Sunday, March 10, 2013. Mr. Hagel is on his first official trip since being sworn in as defense secretary. (AP Photo/Jason Reed, Pool)
U.S. Secretary of Defense Chuck Hagel (left) meets with Afghan Interior Minister Ghulam Mujtaba Patang at the International Security Assistance Force headquarters in Kabul, Afghanistan, on Sunday, March 10, 2013. Mr. Hagel is on his first official trip since being sworn in as defense secretary. (AP Photo/Jason Reed, Pool)
U.S. Marine Gen. Joseph F. Dunford (right) shakes hands with U.S. Marine Gen. John Allen (left), the outgoing NATO commander, during a change-of-command ceremony at the International Security Assistance Force headquarters in Kabul, Afghanistan, on Sunday, Feb. 10, 2013. Gen. Dunford takes charge at a critical time for President Obama and the military as foreign combat forces prepare to withdraw from Afghanistan by the end of 2014. (AP Photo/Massoud Hossaini, Pool)
U.S. Marine Gen. Joseph F. Dunford (right) shakes hands with U.S. Marine Gen. John Allen (left), the outgoing NATO commander, during a change-of-command ceremony at the International Security Assistance Force headquarters in Kabul, Afghanistan, on Sunday, Feb. 10, 2013. Gen. Dunford takes charge at a critical time for President Obama and the military as foreign combat forces prepare to withdraw from Afghanistan by the end of 2014. (AP Photo/Massoud Hossaini, Pool)
A U.S. soldier with the NATO-led International Security Assistance Force (ISAF) investigates the scene after two suicide attacks in Spin Boldak, Kandahar province, south of Kabul, Afghanistan, Sunday, Jan. 6, 2013. Two suicide bombers penetrated a government compound in the country's south Sunday, killing several, Afghan officials said. There were no reports of foreign troops or civilians at the site. (AP Photo/Allauddin Khan)
A U.S. soldier with the NATO-led International Security Assistance Force (ISAF) investigates the scene after two suicide attacks in Spin Boldak, Kandahar province, south of Kabul, Afghanistan, Sunday, Jan. 6, 2013. Two suicide bombers penetrated a government compound in the country's south Sunday, killing several, Afghan officials said. There were no reports of foreign troops or civilians at the site. (AP Photo/Allauddin Khan)
** FILE ** This July 13, 2011, photo made available on the International Security Assistance Force's Flickr website shows Gen. David H. Petraeus shaking hands with Paula Broadwell, co-author of "All In: The Education of General David Petraeus." (AP Photo/International Security Assistance Force)
U.S. Defense Secretary Leon Panetta, right, smiles as he is greeted by U.S. Ambassador to Afghanistan James B. Cunningham, center, and Marine Gen. John R. Allen, left, commander of International Security Assistance Force, upon arriving at Kabul International Airport in Kabul, Afghanistan, Wednesday, Dec. 12, 2012. (AP Photo/Susan Walsh, Pool)
