U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, and U.S. Marine Corps Gen. James N. Mattis, commander, U.S. Central Command, share a laugh before the International Security Assistance Force change-of-command ceremony in Kabul, Afghanistan, July 18, 2011. U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, and U.S. Marine Corps Gen. James N. Mattis, commander, U.S. Central Command, share a laugh before the International Security Assistance Force change-of-command ceremony in Kabul, Afghanistan, July 18, 2011. SHARE IMAGE: Download Image: Full Size (3.41 MB) Tags: Photo Essays Photo By: VIRIN: 214659-G-TBP64-572.jpg Photo Gallery