Dr. Rory A. Cooper, founder and director of the University of Pittsburg Human Engineering Research Labortories; Marine Corps Sgt. Maj. Ronald L. Green, center, sergeant major of the Marine Corps, and Sgt. Maj. Joseph Gray, sergeant major of Marine Barracks Washington, participate in honors during a sunset parade at the Iwo Jima War Memorial, Arlington, Va., June 28, 2016. Sunset parades are held as a means of honoring senior officials, distinguished citizens and supporters of the Marine Corps. ( Marine Corps photo by Lance Cpl. Kayla V. Staten)

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