U.S. Army Gen. Martin E. Dempsey, right, chairman of the Joint Chiefs of Staff, and Canadian Air Force Gen. Thomas J. Lawson, chief of the defense staff of Canada's armed forces, salute during the playing of each country's national anthem, prior to the start of the U.S.-Canada Defense Chiefs Strategy Dialogue at the National Defense University in Washington, D.C., June 4, 2015. U.S. Army Gen. Martin E. Dempsey, right, chairman of the Joint Chiefs of Staff, and Canadian Air Force Gen. Thomas J. Lawson, chief of the defense staff of Canada's armed forces, salute during the playing of each country's national anthem, prior to the start of the U.S.-Canada Defense Chiefs Strategy Dialogue at the National Defense University in Washington, D.C., June 4, 2015. SHARE: Download: Full Size (0.65 MB) Tags: Photo Essays Credit: VIRIN: 450744-D-NLV98-421.jpg Photo Gallery