Dr. Rory A. Cooper, founder and director of the University of Pittsburg Human Engineering Research Labortories, and Marine Corps Sgt. Maj. Ronald L. Green, sergeant major of the Marine Corps, arrive during a sunset parade at the Marine Corps 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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