NOTRE DAME SPEECH Defense Secretary Robert M. Gates speaks during the University of Notre Dame commencement ceremony in South Bend, Ind., May 22, 2011. Gates told graduates that the size and strength of the U.S. military will be key to U.S. success in the 21st Century. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 928324-H-NEQ00-572.jpg Photo Gallery