A U.S. Soldier of Chaos Company, 2nd Battalion, 159th Aviation Regiment (Attack Reconnaissance), 12th Combat Aviation Brigade conducts maintenance on an AH-64D Apache Longbow helicopter during exercise Saber Junction 15 at the U.S. Army’s Joint Multinational Readiness Center in Hohenfels, Germany, April 26, 2015. Saber Junction 15 prepares NATO and partner nation forces for offensive, defensive, and stability operations and promotes interoperability among participants. Saber Junction 15 has more than 4,700 participants from 17 countries, to include: Albania, Armenia, Belgium, Bosnia, Bulgaria, Great Britain, Hungary, Latvia, Lithuania, Luxembourg, Macedonia, Moldova, Poland, Romania, Sweden, Turkey, and the U.S. (U.S. Army photo by Staff Sgt. Carol A. Lehman/Released)