Helicopter Bell UH-1H Iroquois Serial 13473 Register 73-21785 used by US Air Force USAF ,US Army Aviation Army. Aircraft history and location Aircraft History 73-21785 US Army Aviation US Army 2014 US Air Force Bell TH-1H Iroquois USAF, UH-1H conv to TH-1H Mar14 23 FTS /FR 23 FTS Send Updates Use APP to upload photo @ (optional) When Now? / / Send