Helicopter Sikorsky H-37A Mojave Serial 56-089 Register 55-649 used by US Army Aviation Army. Built 1958. Aircraft history and location Aircraft History 55-649 US Army Aviation 1958-06-11Sikorsky S-56, c/n 56-089, ff:? del US ARMY as H-37A, 55-649, 11Jun58 redesig CH-37A, Oct 62 conv CH-37B, unk wfu & soc unk. Send Updates Use APP to upload photo @ (optional) When Now? / / Send