The unit was redesignated as the 347th Fighter Wing (All Weather) and reactivated in Japan on 20 February 1947 as part of Far East Air Forces 315th Composite Wing to perform air defense duties. The wing was assembled from three former Northrop F-61B Black Widow night fighter squadrons, the 6th, 418th, and 421st. The squadrons were redesignated the 339th, 4th, and 68th squadrons, respectively. In August 1948, their designations were changed to Fighter (All Weather) Squadron to more closely identify their mission.