Gen. David Petraeus is the subject of The Insurgents: David Petraeus and the Plot to Change the American Way of War, a new book by Fred Kaplan. Shah Marai/AFP/Getty Images hide caption

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U.S. troops in Afghanistan appear to have mixed feelings about the decision lifting the ban on women in combat positions. Some women already operate in combat zones. Hospital Corpsman Shannon Crowley is shown here with her Marine Corps team in Musa Qala, Afghanistan, in November 2010. Paula Bronstein/Getty Images hide caption

itoggle caption Paula Bronstein/Getty Images

Prince Harry, known when on duty as "Capt. Wales," in the cockpit of an Apache helicopter while he was in Afghanistan last month. John Stillwell/PA wire/pool/EPA /Landov hide caption

itoggle caption John Stillwell/PA wire/pool/EPA /Landov

Afghan President Hamid Karzai and President Obama during Friday's news conference at the White House. Jim Lo Scalzo/EPA /LANDOV hide caption

itoggle caption Jim Lo Scalzo/EPA /LANDOV

Deputy provincial governors and district governors selected under a new merit-based program are sworn in Tuesday in Kabul. The development is part of an effort to address rampant corruption in Afghanistan. Sean Carberry/NPR hide caption

itoggle caption Sean Carberry/NPR

President Obama and Afghan President Hamid Karzai greet each other during a May 20 meeting at the NATO Summit in Chicago. Karzai is in Washington, D.C., this week to meet Obama and other senior U.S. officials. Pablo Martinez Monsivais/AP hide caption

itoggle caption Pablo Martinez Monsivais/AP