DEFENSE CHIEFS U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, left, French Navy Adm. Edouard Guillaud, chief of Defense Staff, center, and British Gen. Sir David Richards, chief of Defense Staff, right, leave Lancaster House in London, June 10, 2011. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 214010-B-HFE28-948.jpg Photo Gallery