DISTINGUISHED SERVICE Defense Secretary Robert M. Gates presents the Defense Distinguished Service Medal to Army Chief of Staff Gen. George W. Casey Jr. during ceremonies at the Pentagon, April 11, 2011. The medal marks his retirement from active duty after more than 40 years of dedicated service. Casey's wife, Sheila, center, shared every step of his distinguished career, and later received the Defense Distinguished Civilian Service Medal for her work with Army families. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 732251-I-IYJ30-119.jpg Photo Gallery