Keywords: 120911-D-NI589-356 (7980143110).jpg From left Secretary of Defense Leon E Panetta President Barack Obama and Chairman of the Joint Chiefs of Staff Army Gen Martin E Dempsey attend a remembrance ceremony at the Pentagon Memorial Sept 11 2012 as they mark the 11th anniversary of the Sept 11 2001 terrorist attacks 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 Glenn Fawcett/Released https //www flickr com/photos/39955793 N07/7980143110/ 120911-D-NI589-356 2012-09-11 09 33 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 N07/7980143110 2016-09-03 10 13 20 United States Government Work Presidents United States Department of Defense |