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WASHINGTON, DC - JUNE 15:  U.S. Defense Secretary Robert Gates smiles while participating in a Senate Defense Subcommittee hearing on proposed budget estimates for FY2012 for the Defense Department, on June 15, 2011 in Washington, DC. Secretary Gates said this would he his last appearance before Congressional committee before retiring at the end of June.  (Photo by Mark Wilson/Getty Images) Mark Wilson/Getty Images
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