Helicopter Sikorsky H-19D Chickasaw Serial 55-1148 Register 56-4261 used by US Army Aviation Army. Built 1957. Aircraft history and location Aircraft History 56-4261 US Army Aviation 1957-11-25Sikorsky S-55 c/n 55-1148, ff:? del US Army as H-19D, 56-4261, 25Nov57. Send Updates Use APP to upload photo @ (optional) When Now? / / Send