A U.S. Army officer, center, with the Joint Multinational Readiness Center in Hohenfels, Germany, speaks with Macedonian and Croatian military officers during exercise Immediate Response 2013 in Zagreb, Croatia, Aug. 23, 2013. Immediate Response is a U.S. Army Europe-led combined joint tactical field training exercise designed to build interoperability between NATO, Croatia and its regional partner nations. (DoD photo by Staff Sgt. Caleb Barrieau, U.S. Army/Released)