Exercise Summer Shield A Marine and Latvian soldiers plan for combined anti-armor training on Adazi Military Base, Latvia, April 19, 2017. Exercise Summer Shield is a NATO multinational training exercise. Marine Corps photo by Sgt. Patricia A. Morris SHARE IMAGE: Download Image: Full Size (1.18 MB) Tags: Summer Shield 17, NATO, MARINE CORPS, MARINES Photo By: Sgt. Patricia A. Morris VIRIN: 170419-M-MV107-1007.JPG Photo Gallery