U.S., Bulgarian Defense Officials Meet in Brussels Defense Secretary James N. Mattis and U.S. Ambassador to NATO Kay Bailey Hutchinson, left, conduct bilateral discussions with Bulgaria’s Defense Minister Krasimir Karakachanov at NATO Headquarters in Brussels, Feb. 15, 2018. NATO photo SHARE IMAGE: Download Image: Full Size (2.14 MB) Tags: James N. Mattis, SecDef, NATO Photo By: NATO photo VIRIN: 180215-O-ZZ999-001.JPG Photo Gallery