Helicopter Sikorsky H-37A Mojave Serial 56-143 Register 58-998 used by US Army Aviation Army. Built 1960. Aircraft history and location Aircraft History 58-998 US Army Aviation 1960-01-22Sikorsky S-56, c/n 56-143, ff:? del US ARMY as H-37A, 58-998, 22Jan60 redesig CH-37A, Oct 62 conv CH-37B, unk wfu & soc unk. Send Updates Use APP to upload photo @ (optional) When Now? / / Send