Helicopter Sikorsky H-34A Choctaw Serial 58-574 Register 55-4503 used by US Army Aviation Army. Built 1957. Aircraft history and location Aircraft History 55-4503 US Army Aviation 1957-06-03 Sikorsky CH-34C Choctaw del US ARMY as H-34A, 55-4503, 03Jun57 to H-34C by Jan62 soc 504th Aviation Bn, 4th Armor Div, Apr63. 1963-05-25w/o 25may63 Send Updates Use APP to upload photo @ (optional) When Now? / / Send