Adm. Mike Mullen responds to a question during a press conference. Chairman of the Joint Chiefs of Staff Adm. Mike Mullen, U.S. Navy, responds to a question during a press conference with Secretary of Defense Robert M. Gates in the Pentagon on May 18, 2011. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 266467-G-WGS26-752.jpg Photo Gallery