180911-D-SV709-0184 WASHINGTON (Sept. 11, 2018) Members of the U.S. Naval Academy Glee Club perform during the 9/11 Observance Ceremony at the Pentagon in Arlington, Va., Sept. 11, 2018. During the Sept. 11, 2001 attacks 184 people were killed at the Pentagon. (U.S. Army photo by Sgt. Amber I. Smith/Released)