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WASHINGTON, DC - MAY 19:  Defense Undersecretary for Acquisition, Technology, and Logistics Ashton Carter testifies during a hearing before the Senate Armed Services Committee May 19, 2011 on Capitol Hill in Washington, DC. The hearing was held to examine the F-35 joint strike fighter program in review of the defense authorization request for FY2012 and the future years defense program.  (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - MAY 19:  Defense Undersecretary for Acquisition, Technology, and Logistics Ashton Carter testifies during a hearing before the Senate Armed Services Committee May 19, 2011 on Capitol Hill in Washington, DC. The hearing was held to examine the F-35 joint strike fighter program in review of the defense authorization request for FY2012 and the future years defense program.  (Photo by Alex Wong/Getty Images)

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    Obama nominates Carter as Defense Secy.

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Obama nominates Carter as Defense Secy.

President Obama nominates former senior Pentagon official Ashton Carter as U.S. Secretary of Defense.

Obama nominates Carter as Defense Secy.

President Obama nominates former senior Pentagon official Ashton Carter as U.S. Secretary of Defense.