The 140th Aeromedical Transport Squadron was bestowed the lineage and history of the inactivated Pennsylvania ANG's 148th FIS. The unit was re-equipped with the Curtiss C-46 Commando, and in 1958 the Fairchild C-119 Flying Boxcar. 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.