Helicopter Sikorsky H-19D Chickasaw Serial 55-1044 Register 56-1539 used by US Army Aviation Army. Built 1957. Aircraft history and location Aircraft History 56-1539 US Army Aviation 1957-01-08Sikorsky S-55 c/n 55-1044, ff:? del US Army as H-19D, 56-1539, 08Jan57. Send Updates Use APP to upload photo @ (optional) When Now? / / Send