Esper and Karakachanov Defense Secretary Dr. Mark T. Esper and the Bulgarian Defense Minister Dr. Krasimir Karakachanov, hold copies of the signed 10-year road map charting defense cooperation agreement at the Pentagon, Washington D.C., Oct. 6, 2020. SHARE IMAGE: Download Image: Full Size (3.06 MB) Tags: Defense Secretary , Partnerships, Esper Photo By: Air Force Staff Sgt. Jack Sanders, DOD VIRIN: 101006-D-XI929-1004.JPG Photo Gallery