PASSING THE REINS Navy Adm. Mike Mullen, left, outgoing chairman of the Joint Chiefs of Staff, congratulates the new chairman of the Joint Chiefs of Staff, Army Gen. Martin E. Dempsey, during the Chairman of the Joint Chiefs of Staff change of responsibility ceremony on Joint Base Myer-Henderson Hall, Va., Sept. 30, 2011. Mullen retired after 43 years of service and Dempsey became the 18th chairman of the Joint Chiefs of Staff during the ceremony. SHARE IMAGE: Download Image: Full Size (0.06 MB) Photo By: VIRIN: 026841-S-NNW76-965.jpg Photo Gallery