U.S. Soldiers of 2nd Battalion, 159th Aviation Regiment, 12th Combat Aviation Brigade conduct pre-flight inspections on an AH-64D Apache Longbow helicopter during exercise Allied Spirit at the Joint Multinational Readiness Center in Hohenfels, Germany, Jan. 22, 2015. Exercise Allied Spirit includes more than 2,000 participants from Canada, Hungary, Netherlands, United Kingdom, and the U.S. Allied Spirit is exercising tactical interoperability and testing secure communications within alliance members. (U.S. Army photo by Spc. Justin De Hoyos/Released)