Helicopter Sikorsky H-19D-3 Serial 55-961 Register 55-3212 used by US Army Aviation Army. Built 1956. Aircraft history and location Aircraft History 55-3212 US Army Aviation 1956-05-01Sikorsky S-55 c/n 55-961, ff:? del US Army as H-19D-3, 55-3212, 01May56. Send Updates Use APP to upload photo @ (optional) When Now? / / Send