U.S.-MEXICO DIALOGUE U.S. Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, meets with Mexican leaders army Gen. Salvador Cienfuegos Zepeda, defense secretary, and navy Adm. Vidal Francisco Soberon Sanz, navy secretary, for the U.S.-Mexico Defense Chiefs Strategy Dialogue at the National Defense University on Fort McNair in Washington D.C., July 15, 2013. SHARE IMAGE: Download Image: Full Size (0.07 MB) Photo By: VIRIN: 988766-S-YXT29-856.jpg Photo Gallery