SAN DIEGO, Calif (Nov. 18, 2011) Rear Adm. Thomas K. Shannon delivers remarks as he assumes command of Carrier Strike Group 1. Shannon relieved Rear Adm. Samuel Perez during a change of command ceremony aboard the Nimitz-class aircraft carrier USS Carl Vinson (CVN 70). Carl Vinson is in homeport at Naval Air Station North Island. (U.S. Navy photo by Mass Communication Specialist 2nd Class James R. Evans/Released)