Helicopter Sikorsky H-19D Chickasaw Serial 55-953 Register 55-3209 used by US Army Aviation Army. Built 1956. Aircraft history and location Aircraft History 55-3209 US Army Aviation 1956-04-10Sikorsky S-55 c/n 55-953, ff:? del US Army as H-19D, 55-3209, 10Apr56. Send Updates Use APP to upload photo @ (optional) When Now? / / Send