U.S. Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, watches as Mexico's Defense Secretary army Gen. Salvador Cienfuegos Zepeda greets people during the U.S.-Mexico Defense Chiefs Strategy Dialogue at the National Defense University on Fort McNair in Washington, D.C., 15 July, 2013. U.S. Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, watches as Mexico's Defense Secretary army Gen. Salvador Cienfuegos Zepeda greets people during the U.S.-Mexico Defense Chiefs Strategy Dialogue at the National Defense University on Fort McNair in Washington, D.C., 15 July, 2013. SHARE: Download: Full Size (2.98 MB) Tags: photo essays Credit: VIRIN: 124606-V-MCL10-301.jpg Photo Gallery