Robert Gates

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FILE - In this June 15, 2011, file photo, then-Secretary of Defense Robert Gates testifies regarding the Department of Defense Fiscal Year 2012 budget request before the Senate Appropriations Committee Subcommittee on Defense on Capitol Hill in Washington. Gates asserts in a new memoir that President Barack Obama grew frustrated with U.S. policy in Afghanistan and that Vice President Joe Biden has been wrong on nearly every foreign policy and national security issue. He also accuses members of Congress of inquisition-like treatment of administration officials. (AP Photo/Charles Dharapak, File)

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Then-Secretary of Defense Robert Gates testifies regarding the Department of Defense Fiscal Year 2012 budget request before the Senate Appropriations Committee Subcommittee on Defense on Capitol Hill in Washington, June 15, 2011. (Associated Press) ** FILE **

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**FILE** Pentagon Comptroller Robert F. Hale listens as Secretary of Defense Robert Gates and Chairman of the Joint Chiefs of Staff Adm. Michael Mullen testify regarding the Department of Defense fiscal 2012 budget request before the Senate Appropriations Committee Subcommittee on Defense on Capitol Hill in Washington on June 15, 2011. (Associated Press)

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** FILE ** In a Thursday, June 16, 2011, file photo, Secretary of Defense Robert Gates speaks during a media availability at the Pentagon in Washington. The College of William and Mary has named former U.S. Defense Secretary Gates as its next chancellor. (AP Photo/Alex Brandon, File)

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**FILE** Secretary of Defense Robert Gates listens to a question during a media availability at the Pentagon on June 16, 2011. (Associated Press)

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U.S. Defense Secretary Robert Gates, left, speaks during a joint news conference with Afghan President Hamid Karzai, right, at the presidential palace in Kabul, Afghanistan, Saturday, June 4, 2011. (AP Photo/Musadeq Sadeq)

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President Obama (left) and Defense Secretary Robert Gates (center) walk on May 30, 2011, to the Rose Garden at the White House with Army Gen. Martin Dempsey (front to back right), President Obama's nominee for the next Chairman of the Joint Chiefs of Staff; Adm. James Winnefeld, nominee for vice chairman of the Joint Chiefs; and Gen. Ray Odierno, the nominee for Army Chief of Staff. (Associated Press)

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U.S. Defense Secretary Robert Gates talks with Saudi Arabia's King Abdullah as Ambassador to the U.S. Adel Al-Jubair (center) translates on Wednesday at the king's Palace in Riyadh, Saudi Arabia. The largely Sunni Muslim nation is a U.S. ally. (Associated Press)