U.S. soldiers from the 2nd Battalion, 1st Brigade Combat Team, 3rd Infantry Division fire their M1A2 Abrams battle tank during a military exercise at the Gaiziunu Training Range in Pabrade some 60km (38 miles) north of the capital Vilnius, Lithuania, Thursday, April 9, 2015. The United States of America has been maintaining a persistent presence of rotating land forces on the ground in the Baltic States and Poland since April 2014. (Photo by Mindaugas Kulbis/AP Photo)
