RETIREMENT CEREMONY Defense Secretary Robert M. Gates addresses the audience at the retirement ceremony of Army Chief of Staff Gen. George W. Casey Jr., seated ar right with his family, at the Pentagon, April 11, 2011. Gates praised Casey for his skillful handling of the Army during a difficult period in which the nation was involved in two wars and numerous humanitarian committments. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 187226-H-PEL93-879.jpg Photo Gallery