Player Embed Code: Download Embed Share Acting Defense Secretary Speaks at Marine Corps Commandant Passage of Command Ceremony Defense.gov July 11, 2019 | 6:53 Acting Defense Secretary Dr. Mark T. Esper speaks at the Marine Corps commandant passage of command ceremony at Marine Barracks Washington., July 11, 2019. Marine Corps Commandant Gen. Robert B. Neller is passing command to Marine Corps Gen. David H. Berger.