DISTINGUISHED SERVICE Defense Secretary Robert M. Gates presents U.S. Air Force Gen. Kevin P. Chilton, outgoing commander, U.S. Strategic Command, with the Defense Distinguished Service Award at the U.S. Strategic Command change-of-command ceremony on Offutt Air Force Base, Neb., Jan. 28, 2011. Chilton, who was relieved by Gen. C. Robert Kehler, retired after a 34-year career in which he was the first former astronaut to achieve four-star general officer rank. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 663433-W-HCY44-342.jpg Photo Gallery