Helicopter Sikorsky H-37A Mojave Serial 56-053 Register 55-625 used by US Army Aviation Army. Built 1957. Aircraft history and location Aircraft History 55-625 US Army Aviation 1957-12-13Sikorsky S-56, c/n 56-053, ff:? del US ARMY as H-37A, 55-625, 13Dec57 redesig CH-37A, Oct 62 conv CH-37B, unk wfu & soc unk. Send Updates Use APP to upload photo @ (optional) When Now? / / Send