 On January 1, 1951 a Communist offensive drove UN forces out of the Kimpo area; K-14 was overrun and the 4th F-IW was withdrawn to Japan.In March 1951, the first two Sabre squadrons, from the 4th F-IW, returned to Korea, just in time to meet a new build-up of Communist air strength designed to secure air superiority over northwest Korea, in a prelude to a major ground offensive.While the Australian government had attempted to order the F-86, to replace Mustangs operated in Korea by No.