Helicopter Sikorsky HUS-1 / UH-34D Seahorse Serial 58-949 Register 145781 used by US Marine Corps USMC. Aircraft history and location Aircraft History 145781 US Marine Corps 1966-04-03Sikorsky HUS-1, cn 58-949, ff:? del USMC as HUS-1, 145781, unk w/o in Southeast Asia, 03Apr66. Send Updates Use APP to upload photo @ (optional) When Now? / / Send