The South Korean navy has made its first major transformation into a blue-water navy through the formation of the Strategic Mobile Fleet, which includes a battle group of Chungmugong Yi Sun-sin class destroyers, Dokdo class amphibious assault ship, AIP-driven Type 214 submarines, and King Sejong the Great class destroyers, which is equipped with the latest baseline of Aegis fleet-defense system that allows the ships to track and destroy multiple cruise missiles and ballistic missiles simultaneously, forming an integral part of South Korea's indigenous missile defense umbrella against the North Korean military's missile threat.