Secretary Gates and Adm. Michael Mullen are welcomed planeside after landing in Mexico City. Secretary of Defense Robert M. Gates and Chairman of the Joint Chiefs of Staff Adm. Michael Mullen are welcomed planeside after landing in Mexico City, Mexico, by Ambassador Carlos Pascual and other Mexican officials on Mar. 22, 2010. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 589205-U-AHW37-295.jpg Photo Gallery