Helicopter Bell AH-1Z Viper Serial Register 169503 used by US Marine Corps USMC. Aircraft history and location Aircraft History 169503 nov21 US Marine Corps EP-55 A ROTMasg VMM-265 (Reinforced) HMLA-169 2022-01-13EP-55 A ROTM mishap hydraulic leak and precautionary landing at Tonaki Heliport, Tonaki, Okinawa rtn to homebase next day Send Updates Use APP to upload photo @ (optional) When Now? / / Send