Secretary of Defense Robert M. Gates pauses during an interview with the Associated Press in his office at the Pentagon on Monday, June 13, 2011. (AP Photo/Alex Brandon)
Sarah Palin, with her daughter Piper (center), answers a reporter's question at the beginning of the Rolling Thunder motorycycle ride at the Pentagon on Sunday. She smiled broadly when many in the crowd urged her to run for the presidency.
Former Alaska Gov. Sarah Palin (second from right), the 2008 GOP vice presidential nominee, gives a thumbs up from the back seat of a motorcycle at the beginning of Rolling Thunder at the Pentagon in suburban Washington on Sunday, May 29, 2011. (AP Photo/Alex Brandon)
Secretary of Defense Robert M. Gates (left) and Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, speak to the press at the Pentagon outside Washington on Wednesday, May 18, 2011. (AP Photo/Alex Brandon)
Pentagon employee Christy Heib wipes her eyes while sitting on a bench at the Pentagon Memorial in Arlington on Monday. Ms. Heib says the Sept. 11 attacks are why she began a government career. (Barbara L. Salisbury / The Washington Times)
U.S. Navy Vice Adm. William E. Gortney, staff director of the Joint Chiefs of Staff, gives an operational update on Libya at the Pentagon outside Washington on Sunday, March 20, 2011. (AP Photo/Cliff Owen)
Defense Secretary Robert M. Gates (right) talks with U.S. Army Gen. David H. Petraeus upon the Pentagon chief's arrival in Kabul, Afghanistan, on Monday, March 7, 2011. (AP Photo/Defense Department/Cherie Cullen)
Defense Secretary Robert M. Gates listens as Joint Chiefs of Staff Chairman Adm. Mike Mullen speaks Tuesday at the Pentagon about the Libya turmoil. (Associated Press)
Michael G. Vickers, assistant secretary of defense for special operations, said the Pentagon was not the appropriate agency to assess economic warfare and financial terrorism risks. (Associated Press)
Secretary of the Air Force Michael Donley (left) and Deputy Defense Secretary William Lynn announce the KC-46A tanker contract award to Boeing Co. during a news conference at the Pentagon in Washington on Thursday. (Associated Press)
Secretary of Defense Robert Gates talks about the Defense Department's proposed budget at the Pentagon in Washington, Monday, Feb. 14, 2011.(AP Photo/Alex Brandon)
Joint Chief Vice Chairman Gen. James E. Cartwright, right, accompanied by Defense Undersecretary for Personnel and Readiness Clifford Stanley, conduct a media briefing at the Pentagon to discuss the progress of the "Don't Ask, Don't Tell" repeal implementation effort. (AP Photo/Pablo Martinez Monsivais)
Lawrence A. Franklin, a Pentagon analyst (left), pleaded guilty in 2006 to three counts of mishandling classified information. The case involved the American Israel Public Affairs Committee (AIPAC). (Associated Press)
Defense Secretary Robert M. Gates and Joint Chiefs Chairman Adm. Mike Mullen discuss the proposed defense budget, which calls for major personnel cuts, with reporters Thursday at the Pentagon. (Associated Press)
Defense Secretary Robert Gates, left, 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)
Defense Secretary Robert Gates, left, 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)
Defense Secretary Robert Gates, left, 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)