Helicopter Sikorsky H-37A Mojave Serial 56-128 Register 58-983 used by US Army Aviation Army. Built 1959. Aircraft history and location Aircraft History 58-983 US Army Aviation 1959-07-09Sikorsky S-56, c/n 56-128, ff:? del US ARMY as H-37A, 58-983, 09Jul59 redesig CH-37A, Oct 62 conv CH-37B, unk wfu & soc unk. Send Updates Use APP to upload photo @ (optional) When Now? / / Send