Libyan rebel fighters run for cover at the front line near the southwest desert town of Gualish on July 24, as Gadhafi forces started attacking them in an attempt to capture the city. Colin Summers/AFP/Getty Images hide caption

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Afghan National Army soldier Mohammed Shadwar gets a bird's-eye view from the rooftop of a mud-walled compound during a joint clearing operation in Helmand province, Afghanistan. As the top U.S. commander in Afghanistan changes, there's a question of whether U.S. policy will shift from one that supports building up Afghan national security forces to one focused on targeting insurgents. David Gilkey/NPR hide caption

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Secretary of Defense Leon Panetta sits with Gen. Lloyd Austin, the top U.S. commander in Iraq, as they fly in a Black Hawk helicopter over Baghdad on Monday. Paul J. Richards/AP hide caption

itoggle caption Paul J. Richards/AP

Secretary of Defense Robert Gates speaks to troops in Kandahar province, Afghanistan. Jason Reed/Pool/Getty Images hide caption

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In this photo provided by ISAF Regional Command (South), members of Provincial Reconstruction Team Zabul and 1st Stryker Brigade Combat Team, 25th Infantry Division, make their way to the Zabul Juvenile Detention Facility on Wednesday in Qalat, Afghanistan. The effect of al-Qaida leader Osama bin Laden's death on the Afghan insurgency is yet to be seen. Brian Ferguson/U.S. Air Force/AP hide caption

itoggle caption Brian Ferguson/U.S. Air Force/AP