In this Nov. 21, 2013, file photo reviewed by the U.S. military, dawn arrives at the now closed Camp X-Ray at the Guantanamo Bay Naval Base in Cuba — a camp that was used as the first detention facility for al Qaeda and Taliban militants who were captured after the Sept. 11, 2001, attacks on the U.S. (AP Photo/Charles Dharapak, File)
The truck bombing of a U.S. Marine base near the Beirut airport on Oct. 23, 1983, was the worst terror attack on Americans until Sept. 11, 2001. (AP Photo)
Human resource managers with the U.S. Army office of the Surgeon General pay their respects to a former co-worker, Lt. Col. Karen J. Wagner, who was killed in the September 11, 2001 terrorist attack on the Pentagon at the Pentagon Memorial, Arlington, Va., Wednesday, September 11, 2013. (Andrew Harnik/The Washington Times)
The floor of the New York Stock Exchange was without traders Monday as the market closed for the first time since the days after the terrorist attacks of Sept. 11, 2001. If the NYSE remains closed Tuesday, it would be the first two-day shutdown for the exchange due to weather since 1888. (Associated Press)
** FILE ** Carrie Bergonia remembers her fiance, firefighter Joseph Ogren, who was killed in the terrorist attacks of Sept. 11, 2001, during a ceremony marking the 11th anniversary of the attacks at the National Sept. 11 Memorial at the World Trade Center site. (AP Photo/The Daily News, Todd Maisel, Pool)