Helicopter Sikorsky CH-3C Serial 61-594 Register 66-13294 used by US Air Force USAF. Aircraft history and location Aircraft History 66-13294 US Air Force 1968-03-30 Sikorsky CH-3E USAF 21st SOS (56 SOW) w/o 30mar68 hit by ground fire over Laos 21st SOS Send Updates Use APP to upload photo @ (optional) When Now? / / Send