U.S. Army Sgt. 1st Class Samuel Isabell, left, with

U.S. Army Sgt. 1st Class Samuel Isabell, left, with Joint Forces Headquarters, District of Columbia National Guard assists attendees in Washington, Aug. 24, 2013. The event was in observance of the 50th anniversary of Dr. Martin Luther King Jr.'s famous march on Washington, where he gave his historic "I Have a Dream" speech. Service members with the National Guard were on hand to assist local law enforcement agencies with security, safety, and traffic control. (U.S. Army National Guard photo by Sgt. Michael Dann/Released)