Helicopter Sikorsky H-19D Chickasaw Serial 55-1236 Register 57-5945 used by US Army Aviation Army. Built 1958. Aircraft history and location Aircraft History 57-5945 US Army Aviation 1958-11-07Sikorsky S-55 c/n 55-1236, ff:? del US Army as H-19D, 57-5945, 07Nov58. Send Updates Use APP to upload photo @ (optional) When Now? / / Send