U.S. Marines with Black Sea Rotational Force 13 listen to Ambassador Mark Pekala after a joint coordinated live fire during exercise Summer Shield aboard Camp Adazi, Latvia, April 23, 2013. Exercise Summer Shield 10 focuses on integration of fires and maneuver in a joint environment to build partner nation capacity while enhancing our interoperability between the United States, Lithuania, Estonia, and Latvia. (U.S. Marine Corps photo by SSgt David Rakes, Sr./released)