U.S. Navy chief selectees with U.S. Naval War College and Naval Station Newport stand in formation before a 9/11 commemoration ceremony at Naval Station Newport, R.I., Sept. 11, 2014. 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.