Arleigh Burke-class guided-missile destroyer USS Mustin (DDG 89) while underway in the Indian Ocean.USS Mustin is forward-deployed and assigned to Destroyer Squadron (DESRON) 15, the Navy’s largest DESRON and U.S. 7th Fleet’s principal surface force. The Navy’s largest forward-deployed numbered fleet routinely interacts and operates with allies and partners in preserving a free and open Indo-Pacific.