U.S. soldiers check for land mines on a canal running through Highway 1 in Afghanistan's Kandahar province, Aug. 6. Improvised explosive devices, or IEDs, are the Taliban's weapon of choice and are the leading killer of civilians and soldiers in Afghanistan. Romeo Gacad/AFP/Getty Images hide caption

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An Army carry team moves a transfer case containing the remains of Spc. Michael C. Roberts during a dignified transfer ceremony at Dover Air Force Base, Del., on Tuesday. Ann Heisenfelt/AP hide caption

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Incarcerated children sit at the Kabul Juvenile Rehabilitation Center May 18, in Kabul, Afghanistan. The four boys were believed to have been recruited by the Taliban as suicide bombers. In an end-of-Ramadan tradition, President Hamid Karzai recently ordered the release of two dozen children held as suspected suicide bombers. Paula Bronstein/Getty Images hide caption

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Rex Goodnight (right) works with contractors in Afghanistan. His program, Afghanistan Reachback, works to create buildings using the resources Afghans actually have. Courtesy of Rex Goodnight hide caption

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Osama bin Laden (left) and his top lieutenant, Egyptian Ayman al-Zawahiri, are seen at an undisclosed location in this television image broadcast Oct. 7, 2001. In Counterstrike, reporters Thom Shanker and Eric Schmitt say the United States tried to disrupt al-Qaida by attacking the organization's financiers and middlemen. AP hide caption

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Adm. Eric Olson, former commander of the U.S. Special Operations Command, testifies before the House Armed Services Committee in 2009. Tim Sloan/AFP/Getty Images hide caption

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