CELEBRITY INTRODUCTIONS U.S. Navy Adm. James A. Winnefeld Jr., vice chairman of the Joint Chiefs of Staff, introduces the team of celebrities on the USO spring tour as they visit troops in Southwest Asia, April 17, 2012. Several thousand U.S. troops and coalition partners listened as the celebrities spoke, sang and took photos with fans. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 345332-C-AQJ61-614.jpg Photo Gallery