Central Command says an errant coalition strike killed 18 fighters from the Syria Democratic Forces. A member of the U.S.-backed SDF, made up of an alliance of Arab and Kurdish fighters, inspect the Tabqa dam on March 27. Delil Souleiman/AFP/Getty Images hide caption

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Delil Souleiman/AFP/Getty Images

Secretary of Defense Leon Panetta, with Col. John Shafer, at Foward Operating Base Shukvani in Afghanistan on Wednesday. Scott Olson/Getty Images hide caption

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Scott Olson/Getty Images

Tom Bowman

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