Helicopter Sikorsky H-19D Chickasaw Serial 55-943 Register 55-3204 used by US Army Aviation Army. Built 1956. Aircraft history and location Aircraft History 55-3204 US Army Aviation 1956-03-17Sikorsky S-55 c/n 55-943, ff:? del US Army as H-19D, 55-3204, 17Mar56. Send Updates Use APP to upload photo @ (optional) When Now? / / Send