Helicopter Sikorsky HUS-1 / UH-34D Seahorse Serial 58-1785 Register 153120 used by US Marine Corps USMC. Aircraft history and location Aircraft History 153120 US Marine Corps del USMC as UH-34D, 153120, unk to MASDC as 3H0235 May 31, 1973. To civil registry as N27557, later to C-GMAG. Send Updates Use APP to upload photo @ (optional) When Now? / / Send