Undersecretary of the Air Force Erin C. Conaton, shown here during the opening ceremony for Guardian Challenge 2010 at Peterson Air Force Base, Colo., discussed during the Air Force Global Strike Command Technology and Innovation Symposium how critical the Air Force nuclear and global strike missions are to the United States. At the symposium, which took place Nov. 17, 2010, in Shreveport, La., Ms. Conaton emphasized that strengthening the nuclear enterprise is a top priority for Air Force leaders. (U.S. Air Force photo/Lou Hernandez)