In this file photo from Sept. 11, 2001 file photo, a helicopter flies over the Pentagon in Washington, as smoke billows over the building. The Pentagon took a direct, devastating hit from an aircraft and the enduring symbol of American power was evacuated. HEESOON YIM / ASSOCIATED PRESS

Smoke billows from one of the towers of the World Trade Center and flames and debris explode from the second tower, Tuesday, Sept. 11, 2001. In one of the most horrifying attacks ever against the United States, terrorists crashed two airliners into the World Trade Center in a deadly series of blows that brought down the twin 110-story towers. CHAO SOI CHEONG / AP

In this sketch, reviewed by the US Military, Khalid Sheik Mohammed, center, and Waleed bin Attash, two of the alleged Sept. 11, 2001 attack co-conspirator, attend their June 5, 2008 arraignment inside the war crimes courthouse at Camp Justice. JANET HAMLIN / POOL SKETCH ARTIST

Alleged 9/11 plotter Ramzi bin al Shibh in this International Committee of the Red Cross photo taken at the Guantanamo Bay prison camps, whose link appeared on an al Qaeda website Aug. 16, 2010.

Ramzi bin al Shibh in this International Committee of the Red Cross photo taken at the Guantanamo Bay prison camps, whose link appeared on an al Qaeda website Aug. 16, 2010.

In this June 5, 2008 courtroom sketch, which was approved by the U.S. military, alleged 9/11 facilitator Ramzi Bin al Shibh, center-right, sits with one of his defense lawyers Tom Durkin, during his arraignment at the U.S. Military Commissions, at the U.S. Navy base at Guantánamo Bay in Cuba.

This before and after shows Ramzi bin al Shibh, failed 9/11 hijacker and accused co-conspirator, from left, at a June 2008 hearing at his military commission arraignment at Guantánamo Bay, Cuba, and, right, in a photo taken before his 2003 capture by the CIA.

In this courtroom sketch by pool artist Janet Hamlin, approved for release by the U.S. military, the five Sept. 11, 2001 attack co-defendants sit during a hearing at the U.S. Military Commissions at the U.S. Navy Base, in Guantánamo Bay, Cuba, Monday, Jan. 19, 2009. From top to bottom, they are Khalid Sheik Mohammed, Waleed Bin Attash, Ramzi Bin al-Shibh, Ammar al Baluchi, also known as Ali Abdul Aziz Ali, and Mustafa Ahmad al Hawsawi. JANET HAMLIN / POOL SKETCH ARTIST

Attorney General Eric Holder speaks during a news conference announcing that Sept. 11 mastermind Khalid Sheik Mohammad will be tried in a military commission, at the Justice Department on April 4, 2011 in Washington, DC. Mohammad and four co-defendants are accused of planning the Sept. 11, 2001 terrorist attacks and will be tried in a military tribunal at Guantanamo Bay prison instead of federal court. MARK WILSON / GETTY IMAGES

Khalid Sheik Mohammed poses for the International Committee of the Red Cross at Guantanamo.

Alleged al Qaeda lieutenant Ammar al Baluchi poses for the International Committee of the Red Cross in detention at Guantanamo earlier this year. He is a nephew of Khalid Sheik Mohammed, and a self described "Microsoft-trained software engineer." He holds up a Koran whose page is too fuzzy to identify the sura, or chapter, inside in Camp 7, the secret detention center at Guantanamo Bay, Cuba, where former CIA detainees are segregated. The image offers a rare. if limited, look inside the prison camp run by a clandestine military team called Task Force Platinum.

The American flag flies at half-staff at the military commissions at the U.S. Navy base at Guantanamo Bay, Cuba, on Sept. 11, 2008. Monday, Attorney General Eric Holder said the Pentagon will once again be assigned the task of putting on trial the five 9/11 accused now at Guantanamo, chief among them confessed mastermind Khalid Sheik Mohammed. CAROL ROSENBERG/ THE MIAMI HERALD