U.S. Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, meets with U.S. Ambassador to Brazil Thomas A. Shannon, in Brasilia, Brazil, March 29, 2012. The two leaders discussed continued bi-lateral partnerships between the two countries. U.S. Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, meets with U.S. Ambassador to Brazil Thomas A. Shannon, in Brasilia, Brazil, March 29, 2012. The two leaders discussed continued bi-lateral partnerships between the two countries. SHARE: Download: Full Size (0.63 MB) Tags: Photo Essays Credit: VIRIN: 797188-G-WCP93-318.jpg Photo Gallery