Helicopter Sikorsky HUS-1 / UH-34D Seahorse Serial 58-1713 Register 150718 used by US Marine Corps USMC. Aircraft history and location Aircraft History 150718 US Marine Corps Sikorsky UH-34D, cn 58-1713, ff:? del USMC as UH-34D, 150718, unk wfu & xfer US registry as N4218R, unk. Send Updates Use APP to upload photo @ (optional) When Now? / / Send