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Retired Air Force Staff Sgt. Alicia Watkins of Washington, D.C., places a Purple Heart medal next to the name of her friend, Army Sgt. Tamara Thurman, on the bronze plaque commemorating the victims of the Sept. 11 Pentagon terror attacks on Sept. 11, 2011. Watkins said she feels "a tremendous amount of guilt" that she survived the attack on the Pentagon when Thurman did not.
Credit: AP Photo/Chip Somodevilla, Pool
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A young woman grieves during the 10th anniversary commemorative ceremony of the September 11 attacks at the Pentagon in Washington, Sept. 11, 2011.
Credit: AP Photo/Charles Dharapak
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President Barack Obama and first lady Michelle Obama lay a wreath as the 10th anniversary of the September 11 attacks are observed at the Pentagon in Washington, Sept. 11, 2011. At right is Chairman of the Joint Chiefs of Staff Adm. Mike Mullen.
Credit: Charles Dharapak
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An honor guard plays Taps at the the Pentagon Memorial as the 10th anniversary of the September 11 attacks are observed at the Pentagon in Washington, Sept. 11, 2011.
Credit: AP Photo/Charles Dharapak
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A Secret Service counter-sniper team looks out from atop the flag-draped Pentagon during a 10th anniversary remembrance ceremony at the Pentagon Memorial in Washington on Sept. 11, 2011.
Credit: AP Photo/J. Scott Applewhite
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Defense Secretary Leon Panetta, left, and Vice President Joe Biden attend a 10th anniversary remembrance ceremony of the 2001 terror attacks, at the Pentagon Memorial in Washington on Sept. 11, 2011.
Credit: AP Photo/J. Scott Applewhite)
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People listen during the national anthem at a memorial service at the Pentagon Sept. 11, 2011, in Washington, D.C.
Credit: Getty Images
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A mourner grieves during the 10th anniversary commemorative ceremony of the Sept. 11 attacks at the Pentagon in Washington, Sept. 11, 2011.
Credit: AP Photo/Charles Dharapak
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An unidentified man participates in the commemorative ceremony of the Sept. 11 attacks at the Pentagon in Washington, on Sept. 11, 2011.
Credit: AP Photo/J. Scott Applewhite
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Families and survivors honor the victims of the the Sept. 11, 2001, attack on the Pentagon at a 10th anniversary remembrance ceremony at the Pentagon Memorial in Washington, Sept. 11, 2011.
Credit: AP Photo/J. Scott Applewhite
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A woman lays a sunflower on a bench as the 10th anniversary of the September 11 attacks are observed at the Pentagon in Washington, Sept. 11, 2011.
Credit: AP Photo/Charles Dharapak
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Soldiers lay wreaths for each Sept. 11 victim on the at the Pentagon Memorial benches bearing their names during the observance 10th anniversary of the Sept. 11 attacks at the Pentagon in Washington, Sept. 11, 2011.
Credit: AP Photo/Charles Dharapak
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Former Defense Secretary Donald Rumsfeld poses for a photo with people attending the 10th anniversary remembrance ceremony at the Pentagon, in Washington, Sept. 11, 2011.
Credit: AP Photo/J. Scott Applewhite
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People recite the Pledge of Allegiance during a memorial service at the Pentagon in Washington on Sept. 11, 2011.
Credit: Getty Images