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/617818'></iframe> Download Embed Share Mattis Welcomes British Defense Secretary to the Pentagon Defense.gov Aug. 7, 2018 | 0:55 Defense Secretary James N. Mattis hosted an honor cordon to welcome British Defense Secretary Gavin Williamson to the Pentagon, Aug. 7, 2018. During their meeting, the two leaders highlighted the shared values between their countries.