U.S. service members welcome Chairman of the Joint Chiefs of Staff U.S. Army Gen. Martin Dempsey and Chief of the Defense Staff Royal Canadian Air Force Gen. Thomas J. Lawson to a U.S.-Canada Defense Chiefs Strategy Dialogue at the National Defense University's Roosevelt Hall at Fort McNair in Washington, D.C., June 26, 2013. (DoD photo by Staff Sgt. Sean K. Harp, U.S. Army/Released)