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/594086'></iframe> Download Embed Share Secretary, Joint Chiefs Chairman Testify at House Committee Hearing, Part 1 Defense.gov April 12, 2018 | 01:54:46 Defense Secretary James N. Mattis and Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, testify at a House Armed Services Committee hearing on the Defense Department's fiscal year 2019 budget and posture, April 12, 2018. Part 1 of 2.