Adm. Mike Mullen speaks with new Secretary of Defense Leon E. Panetta during his first visit to the Tank. Chairman of the Joint Chiefs of Staff Adm. Mike Mullen speaks with new Secretary of Defense Leon E. Panetta during his first visit to the Tank to meet with the Joint Chiefs in the Pentagon on July 1, 2011. SHARE IMAGE: Download Image: Full Size (0.08 MB) Photo By: VIRIN: 259914-V-IKZ63-716.jpg Photo Gallery