 Under the command of Col. Jack Hayes F-4D Phantom IIs arrived at Kunsan on January 29, 1968 as part of Operation Combat Fox.In March Col. Hayes was replaced by Col. Chuck Yeager, the 4th remained in Korea until replaced by the 354th Tactical Fighter Wing.The 354th TFW consisting of the Kansas Air National Guard, the Ohio Air National Guard, (ANG) and a few members of the District of Columbia Air National Guard flying the F-100, arrived at Kunsan in July 1968, as part of the buildup of forces in Korea.