6 of 17: A U.S. officer weeps during a ceremony to mark the 7th anniversary of the Sept. 11 attacks, at Bagram airbase, north of Kabul, Afghanistan, Thursday, Sept. 11, 2008. U.S. troops in Afghanistan remembered those killed in the Sept. 11 attacks during a ceremony Thursday at an American base in Kabul, where a top U.S. general said terrorism still remains a threat to the world.(AP Photo/Rafiq Maqbool)

Share this gallery