sentences:  In July 1955, the group was again re-designated, this time as the 112th Fighter-Interceptor Group, reflecting the Pennsylvania ANG's mission to counter the threat of Soviet bombers.In December 1957, the 146th replaced their F-84Fs with F-86D Sabre Interceptors, and the 147th followed in early 1958 receiving F-86L Sabre Interceptors.At Reading, by 1956 the 148th Fighter Squadron F-51Ds were reaching the end of their service life and the Air Force was phasing the Mustang out of the inventory.