Helicopter Sikorsky H-19D Chickasaw Serial 55-1269 Register 57-5970 used by US Army Aviation Army. Built 1959. Aircraft history and location Aircraft History 57-5970 US Army Aviation 1959-03-02Sikorsky S-55 c/n 55-1269, ff:? del US Army as H-19D, 57-5970, 02Mar59. Send Updates Use APP to upload photo @ (optional) When Now? / / Send