Helicopter Sikorsky H-37A Mojave Serial 56-072 Register 55-637 used by US Army Aviation Army. Built 1958. Aircraft history and location Aircraft History 55-637 US Army Aviation 1958-03-10Sikorsky S-56, c/n 56-072, ff:? del US ARMY as H-37A, 55-637, 10Mar58 redesig CH-37A, Oct 62 conv CH-37B, unk wfu & soc unk. Send Updates Use APP to upload photo @ (optional) When Now? / / Send