As part of the plan, the ROK Navy established a task force called Maritime Task Flotilla Seven on February 1, 2010, which evolved from the ASW Squadron 51 of the Component Flotilla Five. It is led by a rear admiral (lower half), and headquartered at Jeju Naval Base in Jeju Island. The task force is responsible for the defense of South Korea against sea-borne threats and protection of its sea lines of communication. The Maritime Task Flotilla Seven includes three surface squadrons: The Maritime Task Squadron 71 and 72 are composed of three "Sejong the Great"-class AEGIS guided-missile destroyers and six "Chungmugong Yi Sunshin"-class destroyers; the Mobile Logistics Squadron 77 is composed of "Soyang"-class and "Cheonji"-class fast combat support ships.