Helicopter Sikorsky H-19B Chickasaw Serial 55-697 Register 52-7568 used by US Air Force USAF. Built 1954. Aircraft history and location Aircraft History 52-7568 US Air Force 1954-05-05Sikorsky S-55 c/n 55-697, ff:? del USAF as H-19B, 52-7568, 05May54. Send Updates Use APP to upload photo @ (optional) When Now? / / Send