Soldiers with the 2nd Battalion, 159th Attack Reconnaissance Battalion, 12th Combat Aviation Brigade take off in a Boeing AH-64 Apache helicopter June 18, 2015, in Mirosławiec, Poland, during Saber Strike 15. Encompassing more than 6,000 participants from 13 different nations, Saber Strike is a long-standing U.S. Army Europe-led cooperative training exercise. Designed to improve joint operational capability in a range of missions as well as preparing the participating nations and units to support multinational contingency operations, this year's exercise takes place across Estonia, Latvia, Lithuania and Poland. (U.S. Army photo by Spc. Marcus Floyd, 13th Public Affairs Detachment)
U.S. Marine Sgt. Steven Mashburn, a squad leader with Black Sea Rotational Force, right, holds the American flag during the opening ceremony for Exercise Saber Strike at the Pabrade Training Area, Lithuania, June 8, 2015. The exercise brings NATO and other partner nations together for a multilateral training event designed to promote regional stability and security, strengthen partnerships, and foster trust. (U.S. Marine Corps photo by Sgt. Paul Peterson/Released)