DEFENSE DIALOGUE U.S. Army Gen. Martin E. Dempsey, third from left, chairman of the Joint Chiefs of Staff, hosts Canadian defense leaders for the U.S.-Canada Defense Chiefs Strategy Dialogue, at the National Defense University in Washington, D.C., June 4, 2015. SHARE IMAGE: Download Image: Full Size (0.06 MB) Photo By: VIRIN: 356677-C-YIP00-755.jpg Photo Gallery