DEFENSE LEADERS Polish Defense Minister Tomasz Siemoniak shakes hands with U.S. Navy Adm. James A. Winnefeld Jr., vice chairman of the Joint Chiefs of Staff, before a meeting at the Pentagon, July 25, 2012. U.S. Defense Secretary Leon E. Panetta hosted a meeting of defense leaders to discuss issues of mutual concern. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 412883-X-WWS21-053.jpg Photo Gallery