Pentagon Greeting Defense Secretary Dr. Mark T. Esper and the Bulgarian Defense Minister Dr. Krasimir Karakachanov greet members of the Department of Defense at the Pentagon, Washington D.C., Oct. 6, 2020. SHARE IMAGE: Download Image: Full Size (2.87 MB) Tags: Defense Secretary , Partnerships, Esper Photo By: Air Force Staff Sgt. Jack Sanders, DOD VIRIN: 101006-D-XI929-1002.JPG Photo Gallery