Joint Chiefs Of Staff

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** FILE ** Joint Chiefs Chairman Adm. Mike Mullen speaks to reporters on Tuesday, Nov. 30, 2010, at the Pentagon. (AP Photo/Charles Dharapak)

Pentagon military and civilian staff members listen as Defense Secretary Robert Gates and Joint Chiefs Chairman Adm. Mike Mullen, speak to reporters on gays in the military, Tuesday, Nov. 30, 2010, at the Pentagon. (AP Photo/Charles Dharapak)

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A report of a Pentagon survey on the issues associated with a repeal of "Don't Ask, Don't Tell" is seen on a table,at the Pentagon, Tuesday, Nov. 30, 2010, after Defense Secretary Robert Gates and Joint Chiefs Chairman Adm. Mike Mullen spoke to reporters on gays in the military. (AP Photo/Charles Dharapak)

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Joint Chiefs Vice Chairman Gen. James Cartwright outlines the Defense Department's fiscal year 2010 budget request during a news conference at the Pentagon in Arlington, Virginia, on April 6, 2009. (UPI Photo/Roger L. Wollenberg)

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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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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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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)