Helicopter Sikorsky CH-3C Serial 61-542 Register 65-5691 used by US Air Force USAF. Built 1965. Aircraft history and location Aircraft History 65-5691 US Air Force 1965-01-10Sikorsky S-61R, c/n 61-521, ff? del USAF as CH-3C 65-5691, 10Jan65 conv CH-3E unk Destroyed S.E.A. 27Jun69. 1967-12-22 Sikorsky CH-3E 22dec67 1969-06-27 Sikorsky CH-3E at Thailand, date unk 21st SOS w/o 27jun69 during firefight in Laos 21st SOS Send Updates Use APP to upload photo @ (optional) When Now? / / Send