 In 1960, the 133d FIG was reassigned to Military Air Transport Service (MATS), trading in its air defense interceptors for 4-engines C-97 Stratofreighter transports.With air transportation recognized as a critical wartime need, the unit was re-designated the 133d Air Transport Group (Heavy).During the 1961 Berlin Crisis, both the Group and squadron were federalized on 1 October 1961.