Helicopter Bell UH-1H Iroquois Serial 13481 Register 73-21793 used by US Air Force USAF ,US Army Aviation Army. Aircraft history and location Aircraft History 73-21793 US Army Aviation US Army US Air Force Bell TH-1H Iroquois USAF, UH-1H conv to TH-1H May11 23 FTS 23 FTS Send Updates Use APP to upload photo @ (optional) When Now? / / Send