 In 1960, the 140th was notified that it would be converting once again to the much larger and faster Lockheed C-121 Constellation.Due to longer runway requirements, the C-121s could not fly from Reading Airport, and on 1 February 1961 the unit relocated to its current location at Olmsted Air Force Base (present day Harrisburg Air National Guard Base) due to the inadequate facilities at Reading.At Pittsburgh, the 147th Fighter Squadron was authorized to expand to a group level, and the 171st Air Transport Group was established on 1 February 1961.