Michael Mullen

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Defense Secretary Robert M. Gates and Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, speak to reporters on gays in the military on Tuesday, Nov. 30, 2010, at the Pentagon. (AP Photo/Charles Dharapak)

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Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, walks through Section 60 at Arlington National Cemetery in Arlington, Va., earlier this month. He is focusing on the problem of military suicides. (Associated Press)

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President Obama is seen here Sept. 11 with Joint Chiefs Chairman Adm. Mike Mullen (left) and Secretary of Defense Robert M. Gates at the Pentagon Memorial marking the ninth anniversary of the 9/11 attacks. (Associated Press)

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President Barack Obama, flanked by Defense Secretary Robert Gates, right, and Joint Chiefs Chairman Adm. Michael Mullen, at the Pentagon Memorial, marking the ninth anniversary of the September 11 attacks, Saturday, Sept. 11, 2010. (AP Photo/Charles Dharapak)

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U.S. Navy Adm. Mike Mullen (L), chairman of the Joint Chiefs of Staff and U.S. Army Gen. David Petraeus, commander, International Security Assistance Force depart ISAF headquarters in Kabul, Afghanistan meet in Kabul, Afghanistan on on September 3, 2010. UPI/Chad J. McNeeley/U.S. Navy

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"The United States sees the Lashkar-e-Taiba becoming more lethal by the day and thinks its gradual growth now clearly shows that it has global inspirations to spread terror," said Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, addressing reporters in Islamabad in July. (Bloomberg)

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ASSOCIATED PRESS U.S. Deputy Secretary of State Jacob Lew, left, and Adm. Mike Mullen, the top U.S. military officer, right, take a question from a reporter during a press conference in Baghdad, Iraq, Tuesday, July 27, 2010.

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Defense Secretary Robert Gates, left, accompanied by Joint Chiefs Chairman Adm. Mike Mullen hold a press briefing, Thursday, July 29, 2010 at the Pentagon. (AP Photo/Kevin Wolf)

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Defense Secretary Robert Gates, left, accompanied by Joint Chiefs Chairman Adm. Mike Mullen, hold a press briefing, Thursday, July 29, 2010 at the Pentagon. (AP Photo/Kevin Wolf)

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Defense Secretary Robert Gates, left, accompanied by Joint Chiefs Chairman Adm. Mike Mullen hold a press briefing, Thursday, July 29, 2010, at the Pentagon. (AP Photo/Kevin Wolf)

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"There is a real potential threat there to put American lives at risk," says Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, about the leak of a database of field reports from Afghanistan. (Associated Press)

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President Barack Obama, followed by, from second from left, Gen. David Petraeus, Defense Secretary Robert Gates, Vice President Joe Biden, and Joint Chiefs Chairman Adm. Michael Mullen, walks to the Rose Garden of the White House in Washington, Wednesday, June 23, 2010, to announce that Petraeus would replace Gen. Stanley McChrystal. (AP Photo/Charles Dharapak)

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President Barack Obama stands with (from second from left) Joint Chiefs Chairman Adm. Mike Mullen, Vice President Joe Biden, Gen. David Petraeus, and Defense Secretary Robert Gates, in the Rose Garden of the White House on Wednesday to announce that Petraeus would replace Gen. Stanley McChrystal. (Associated Press)

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** FILE ** President Obama, followed by, from second from left, Gen. David Petraeus, Defense Secretary Robert Gates, Vice President Joseph R. Biden Jr., and Joint Chiefs Chairman Adm. Michael Mullen, walks to the Rose Garden of the White House in Washington, Wednesday, June 23, 2010. (AP Photo/Charles Dharapak)

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Joint Chiefs Chairman Adm. Mike Mullen, left, and Defense Secretary Robert Gates, right, testify on Capitol Hill in Washington, Wednesday, June 16, 2010, before the Senate Appropriations Committee hearing on the Defense Department's fiscal 2011 budget. (AP Photo/Pablo Martinez Monsivais)

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Joint Chiefs Chairman Adm. Mike Mullen, left, and Defense Secretary Robert Gates, take their seats on Capitol Hill in Washington, Wednesday, June 16, 2010, prior to testifying before the Senate Appropriations Committee hearing on the Defense Department's fiscal 2011 budget. (AP Photo/Pablo Martinez Monsivais)

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Joint Chiefs Chairman Adm. Mike Mullen, left, huddles with Defense Secretary Robert Gates on Capitol Hill in Washington, Wednesday, June 16, 2010, during the Senate Appropriations Committee on hearing on the Defense Department's fiscal 2011 budget. (AP Photo/Pablo Martinez Monsivais)

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From left, Joint Chiefs Chairman Adm. Mike Mullen, Defense Robert Gates and Pentagon Comptroller Robert Hale, testify on Capitol Hill in Washington, Wednesday, June 16, 2010, before the Senate Appropriations Committee hearing on the Defense Department's fiscal 2011 budget. (AP Photo/Pablo Martinez Monsivais)