Helicopter Sikorsky HUS-1 / UH-34D Seahorse Serial 58-486 Register 143974 used by US Marine Corps USMC. Built 1957. Aircraft history and location Aircraft History 143974 US Marine Corps 1957-05-17Sikorsky HUS-1 cn 58-486, ff:? del USMC as HUS-1, 143974, 17May57 redesig UH-34D, Oct 1962 xfer HMM-363, YZ-##, unk w/o Dong Ha, RVN, 12Dec66. HMH-363 Send Updates Use APP to upload photo @ (optional) When Now? / / Send