DEFENSE MEETING U.S. Army Gen. Martin E. Dempsey, center, chairman of the Joint Chiefs of Staff, speaks during discussions between U.S. and British military senior leaders during a meeting at the National Defense University on Fort Lesley J. McNair, Washington, D.C., May 5, 2015. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 336279-A-QRZ31-930.jpg Photo Gallery