U.S. Navy Adm. James A. Winnefeld Jr., vice chairman of the Joint Chiefs of Staff, and his wife, Mary, kick off the USO concert for U.S. service members and their families stationed at Osan Air Base, South Korea, March 8, 2015. U.S. Navy Adm. James A. Winnefeld Jr., vice chairman of the Joint Chiefs of Staff, and his wife, Mary, kick off the USO concert for U.S. service members and their families stationed at Osan Air Base, South Korea, March 8, 2015. SHARE: Download: Full Size (2.09 MB) Tags: Photo Essays Credit: VIRIN: 753980-X-IGU61-608.jpg Photo Gallery