Pentagon

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Wreaths laid by a service member during the commemoration of the Sept. 11, 2001, attack on the Pentagon sit on each of the 184 memorial benches of the Pentagon Memorial in Arlington on Sunday, Sept. 11, 2011. (T.J. Kirkpatrick/The Washington Times)

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Tricia Martin and her fiance, Dan Holdridge, both of Stonington, Conn., walk on Sunday, Sept. 11, 2011, in the Pentagon Memorial following the 10th-anniversary commemoration of the Sept. 11 attack on the Defense Department headquarters in Arlington. Mr. Holdridge survived the attack on the Pentagon after being caught under the collapsing building while working in the Naval Command Center. He said that "10 years doesn't mean much of anything — the trauma was overwhelming." (T.J. Kirkpatrick/The Washington Times)

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Wreaths laid by a service member during the commemoration of the Sept. 11, 2001, attack on the Pentagon sit on each of the 184 memorial benches of the Pentagon Memorial in Arlington on Sunday, Sept. 11, 2011. (T.J. Kirkpatrick/The Washington Times)

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Vice President Joseph R. Biden Jr. speaks during the commemoration of the Sept. 11, 2001, attack on the Pentagon as Defense Secretary Leon E. Panetta (left) listens at the Pentagon Memorial in Arlington on Sunday, Sept. 11, 2011. (T.J. Kirkpatrick/The Washington Times)

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Raymond Lightbourn (second from right) of Upper Marlboro, Md., salutes during the national anthem at the commemoration of the Sept. 11 attack on the Pentagon, held at the Pentagon Memorial in Arlington on Sunday, Sept. 11, 2011. Mr. Lightbourn, who attended with his nephew John Allen (second from left) of Clinton, Va., lost his sister Samantha Lightbourn-Allen, Mr. Allen's mother, in the attack on the Pentagon. Reflecting on the past 10 years, Mr. Lightbourn said that "every year opens up the wounds; we relive the experience every time we come here." (T.J. Kirkpatrick/The Washington Times)

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Vice President Joseph R. Biden Jr. speaks at the Pentagon Memorial in Arlington on Sunday, Sept. 11, 2011, during the commemoration of the Sept. 11, 2001, attack on the Defense Department headquarters. (T.J. Kirkpatrick/The Washington Times)

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Adm. Mike Mullen (left), chairman of the Joint Chiefs of Staff; Defense Secretary Leon E. Panetta; and Vice President Joseph R. Biden Jr. stand during the national anthem at the 10th anniversary ceremony of the Sept. 11 attacks at the Pentagon outside Washington on Sunday, Sept. 11, 2011. (AP Photo/Charles Dharapak)

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** FILE ** A security officer walks on the roof of the Pentagon. (AP Photo/Charles Dharapak)

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Former Defense Secretary Donald H. Rumsfeld (left) and former President George W. Bush pause for a moment of silence after laying a wreath at the Pentagon on Saturday, Sept. 10, 2011, in commemoration of the 10th anniversary of the Sept. 11 attacks. (AP Photo/Charles Dharapak)

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Vice President Joseph R. Biden Jr. (right), Defense Secretary Leon E. Panetta (center) and Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, participate in a ceremony on Sunday, Sept. 11, 2011, at the Pentagon to honor victims of the Sept. 11 attacks. (AP Photo/Charles Dharapak)

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Beatriz "Pat" Hymel Lipinski, who was widowed when her husband Lt. Col. Robert J. Hymel was killed at the Pentagon, searches the attic for a photograph of him at her home. She married Ed Lipinski in the years since the attack and they live in Mathews, Va. (Rod Lamkey Jr./The Washington Times)

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Red roses sit beneath the bench honoring Navy Cmdr. William H. Donovan at the National 9/11 Pentagon Memorial in Arlington. The memorial is dedicated to the 184 people who were killed when a hijacked plane was flown into the Pentagon on Sept. 11, 2001. (Barbara L. Salisbury/The Washington Times)

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Civilians and military personnel evacuate the Pentagon in Washington after an earthquake was felt on Tuesday, Aug. 23, 2011. (AP Photo/U.S. Navy, Mass Communication Specialist 2nd Class Jason Graham)

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CONSULTANT: Ashton Carter, the Pentagon's top weapons buyer, earned money from the defense industry while teaching at Harvard. (Associated Press)

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Ashton Carter, undersecretary of defense for acquisition, technology and logistics, discusses a mine-resistant ambush-protected armored fighting vehicle at the Pentagon. President Obama wants to promote the weapons buyer, but Mr. Carter has done some consulting work for the defense industry. (Associated Press)