Helicopter Sikorsky H-19D Chickasaw Serial 55-1198 Register 57-5975 used by US Army Aviation Army. Built 1958. Aircraft history and location Aircraft History 57-5975 US Army Aviation 1958-07-08Sikorsky S-55 c/n 55-1198, ff:? del US Army as H-19D, 57-5975, 08Jul58. Send Updates Use APP to upload photo @ (optional) When Now? / / Send