Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, attends Army Gen. Walter L. "Skip" Sharp's retirement ceremony at Summerall Field, Joint Base Meyer-Henderson Hall, Va., Sept. 1, 2011. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, attends Army Gen. Walter L. "Skip" Sharp's retirement ceremony at Summerall Field, Joint Base Meyer-Henderson Hall, Va., Sept. 1, 2011. SHARE: Download: Full Size (2 MB) Tags: Photo Essays Credit: VIRIN: 369198-Z-PHK50-464.jpg Photo Gallery