Keywords: 130911-D-HU462-210 (9731883838).jpg From left President Barack H Obama; Secretary of Defense Chuck Hagel; and U S Army Gen Martin E Dempsey the chairman of the Joint Chiefs of Staff attend a 9/11 observance ceremony at the Pentagon in Arlington Va Sept 11 2013 Terrorists hijacked four passenger aircraft Sept 11 2001 Two of the aircraft were deliberately crashed into the World Trade Center in New York; one was crashed into the Pentagon; the fourth crashed near Shanksville Pa Nearly 3 000 people died in the attacks DoD photo by Staff Sgt Sean K Harp U S Army/Released https //www flickr com/photos/39955793 N07/9731883838/ 130911-D-HU462-210 2013-09-11 09 48 https //www flickr com/people/39955793 N07 U S Department of Defense Current Photos PD-USGov U S Department of Defense Current Photos https //flickr com/photos/39955793 N07/9731883838 2016-09-03 08 23 16 United States Government Work Memory Presidents United States Department of Defense |