Gen. David Petraeus in Kandahar, Afghanistan, on July 4, 2011. U.S. Navy Lt. j.g. Haraz N. Ghanbari/Getty Images hide caption

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U.S. Navy Lt. j.g. Haraz N. Ghanbari/Getty Images

Three Afghan men on a motorcycle passed by as U.S. Marines patrolled last month in Afghanistan's Helmand Province. Adek Berry /AFP/Getty Images hide caption

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Adek Berry /AFP/Getty Images