Player Embed Code: <iframe width='500' height='300' scrolling='no' frameborder='0' style='border: none; overflow: hidden; width: 500px; height: 300px;' allowtransparency='true' src='https://www.dvidshub.net/video/embed/727500'></iframe> Download Embed Share Senior Enlisted Leader to Joint Chiefs Chairman Holds Farewell Briefing Defense.gov Dec. 9, 2019 | 42:22 Army Command Sgt. Maj. John W. Troxell, senior enlisted advisor to the chairman of the Joint Chiefs of Staff, conducts a farewell briefing and introduces his successor, Air Force Chief Master Sgt. Ramon Colon-Lopez, at the Pentagon, Dec. 9, 2019.