Helicopter Sikorsky H-19D Chickasaw Serial 55-1023 Register 56-1529 used by US Army Aviation Army. Built 1956. Aircraft history and location Aircraft History 56-1529 US Army Aviation 1956-11-26Sikorsky S-55 c/n 55-1023, ff:? del US Army as H-19D, 56-1529, 26Nov56. Send Updates Use APP to upload photo @ (optional) When Now? / / Send