 In 1969, two additional squadrons of F-4Es (4th TFS w/ tail code "LA" & 421st TFS w/ tail code "LC") joined the wing.After this, the F-4Ds assumed forward air control duties, while the more advanced F-4Es concentrated on aircraft escort duties and conducted ground attack missions.The "Stormy" FACs were the principal forward air control for the Cambodian Incursion of 1970.