Helicopter Sikorsky H-19D Chickasaw Serial 55-1128 Register 56-4253 used by US Army Aviation Army. Built 1957. Aircraft history and location Aircraft History 56-4253 US Army Aviation 1957-09-30Sikorsky S-55 c/n 55-1128, ff:? del US Army as H-19D, 56-4253, 30Sep57. Send Updates Use APP to upload photo @ (optional) When Now? / / Send