Rear Adm. Garry E. Hall relieved Royal Navy Commodore Nick Lambert as commander of Combined Task Force (CTF) 158 and Capt. Paul Severs relieved Royal Navy Capt. Bob Sanguinetti as commander of Combined Task Group (CTG) 158.1 on July 17 aboard Ocean 6, an afloat forward operating barge in the north Persian Gulf. Command of CTF 158 typically rotates among coalition partners Australia, United Kingdom, and the United States. CTF 158 is comprised of coalition ships and its primary mission in the Gulf is maintaining security in and around both the Al Basrah and Khawr Al Amaya Oil Terminals -- ABOT and KAAOT, respectively -- in support of U.N. Security Council Resolution 1723.