This graphic was made to recognize the 20th anniversary of the terrorist attacks in New York, Washington D.C., and Pennsylvania on September 11, 2001. We will never forget. (U.S. Marine Corps illustration by Cpl. Lydia Gordon) - This graphic was made to recognize the 20th anniversary of the terrorist attacks in New York, Washington D.C., and Pennsylvania on September 11, 2001. We will never forget. (U.S. Marine Corps illustration by Cpl. Lydia Gordon)