Helicopter Sikorsky H-37A Mojave Serial 56-056 Register 55-627 used by US Army Aviation Army. Built 1958. Aircraft history and location Aircraft History 55-627 US Army Aviation 1958-01-10Sikorsky S-56, c/n 56-056, ff:? del US ARMY as H-37A, 55-627, 10Jan58 redesig CH-37A, Oct 62 conv CH-37B, unk wfu & soc unk. 1963-12-12w/o 12dec63, Vietnam. 4 killed Send Updates Use APP to upload photo @ (optional) When Now? / / Send