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/630848'></iframe> Download Embed Share Mattis Holds News Conference at NATO Headquarters Defense.gov Oct. 4, 2018 | 14:45 Defense Secretary James N. Mattis conducts a news conference at NATO Headquarters in Brussels, Oct. 4, 2018. Mattis is in Belgium to attend the final NATO defense ministers conference of 2018.