MUTUAL IMPORTANCE U.S. Defense Secretary Chuck Hagel thanks Secretary of National Defense Gen. Salvador Cienfuegos Zepeda in Mexico City, April 24, 2014. Hagel participated in the ministerial meeting with Mexico, Canada and the United States to discuss issues of mutual importance with defense counterparts. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 570681-R-QLZ42-947.jpg Photo Gallery