AH-64D Apache Helicopters participate in a combined arms live fire exercise during Saber Strike 17 at Adazi, Latvia, June 08, 2017. Saber Strike 17 is a U.S. Army Europe-led multinational combined forces exercise conducted annually to enhance the NATO Alliance throughout the Baltic region and Poland. This year's exercise includes integrated and synchronized deterrence-oriented training designed to improve interoperability and readiness of the 20 participating nations’ militaries.