President Obama congratulates the new Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey President Barack Obama congratulates the new Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey, U.S. Army, during the chairman of the Joint Chiefs of Staff change of responsibility ceremony at Summerall Field, Joint Base Myer-Henderson Hall, Va., on Sept. 30, 2011. Dempsey succeeded Adm. Mike Mullen, U.S. Navy, as the 18th chairman of the Joint Chiefs. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 953378-S-HGI98-267.jpg Photo Gallery