NATO Arrival Acting Defense Secretary Dr. Mark T. Esper talks with U.S. Ambassador to NATO Kay Bailey Hutchison upon arriving at the alliance's headquarters in Brussels, June 26, 2019. SHARE IMAGE: Download Image: Full Size (1.98 MB) Tags: NATO, partnerships, Esper, acting defense secretary Photo By: Lisa Ferdinando, DOD VIRIN: 190626-D-BN624-0005Y.JPG Photo Gallery