United States Senate Committee On Armed Services

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Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, testifies on Capitol Hill in Washington on Thursday, Feb. 7, 2013, before the Senate Armed Services Committee hearing on the Pentagon's role in responding to the attack last year on the U.S. Consulate in Benghazi, Libya. (AP Photo/J. Scott Applewhite)

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**FILE** Republican Chuck Hagel, President Obama's choice for defense secretary, testifies Jan. 31, 2013, before the Senate Armed Services Committee during his confirmation hearing on Capitol Hill. (Associated Press)

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From left: Former Sens. John W. Warner of Virginia, Chuck Hagel of Nebraska and Sam Nunn of Georgia arrive Jan. 31, 2013, on Capitol Hill to testify before the Senate Armed Services Committee at Hagel's confirmation hearing to be the next Secretary of Defense. (Andrew Harnik/The Washington Times)

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Former Sen. Chuck Hagel arrives on Capitol Hill in Washington on Thursday, Jan. 31, 2013, to testify before the Senate Armed Services Committee on his confirmation to be the next secretary of defense. (Andrew Harnik/The Washington Times)

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Sen. Lindsey Graham, R-S.C., a member of the Senate Armed Services Committee and the Senate Homeland Security Committee, center, accompanied by fellow Senate Armed Services Committee member, Sen. Kelly Ayotte, R-N.H.,, right, gestures while speaking to reporters on Capitol Hill in Washington, Tuesday, Nov. 27, 2012, after a closed-door meeting with UN Ambassador Susan Rice. (AP Photo/J. Scott Applewhite)

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Sen. John McCain, R-Ariz., ranking Republican on the Senate Armed Services Committee, speaks with reporters on Capitol Hill in Washington, Friday, Nov. 16, 2012, following a closed-door hearing of the Senate Intelligence Committee where former CIA Director David Petraeus testified on the Sept. 11, 2012 attack in Libya. (AP Photo/Cliff Owen)

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**FILE** Sen. John McCain (right) of Arizona, the ranking Republican on the Senate Armed Services Committee, and fellow committee member Sen. Kelly Ayotte (left), New Hampshire Republican, listen as Sen. Lindsey Graham, South Carolina Republican, speaks during a news conference on Capitol Hill in Washington on Nov. 14, 2012. (Associated Press)