Esper and Hutchison Acting Defense Secretary Dr. Mark T. Esper walks with the permanent representative of the United States to the North Atlantic Treaty Organization, Ambassador Kay Bailey Hutchison, as he arrives at NATO headquarters in Brussels, June 26, 2019. SHARE: Download: Full Size (3.12 MB) Tags: nato, Esper, Acting Secretary of Defense Credit: Lisa Ferdinando, DOD VIRIN: 190626-D-BN624-0016.JPG Photo Gallery