A U.S. Marine lays a wreath at the Pentagon 9/11 observance ceremony, Sept. 11, 2011, honoring the 184 victims killed when American Airlines Flight 77 crashed into the Pentagon during a terrorist attack 10 years ago.

DOD photo by U.S. Navy Petty Officer 1st Class Chad J. McNeeley

Video > Pentagon 9/11 Memorial Service (October 11, 2001)
Video > The Pentagon - A Decade of Courage