CARNEGIE EVENT Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, speaks at the Carnegie Endowment for International Peace in Washington, D.C., Sept. 20, 2011. Mullen, who retires this month, offered his view of how war, peace, society and the world have changed since he graduated from the U.S. Naval Academy 43 years ago. SHARE IMAGE: Download Image: Full Size (0.06 MB) Photo By: VIRIN: 437041-J-YAW83-095.jpg Photo Gallery