U.S. Army AH-64D Apache attack helicopters assigned to the 2nd Battalion, 159th Aviation Regiment (Attack Reconnaissance) fly over a simulated war zone to provide cover for Czech Land Forces soldiers during exercise Combined Resolve Nov. 11, 2013, at the Joint Multinational Readiness Center in Hohenfels, Germany. Combined Resolve is an annual U.S.-led combined arms exercise designed to prepare U.S. and European forces for multinational operations.