This aircraft is ex US Coast Guard serial 1708 and has registration N464DF reserved (previously assigned to a Cessna 337 Skymaster), but no civil registration is worn at the photo date. It flew with the US Forest Service as "Tanker 116" during the 2017 fire season and was reported to become N116Z eventually, a registration reserved by the US Forest Service since 1997. However, there is no proof that this registration was ever carried by this aircraft, which was handed over to CAL Fire after a 2018 US Forest Service decision to abandon its Hercules fleet.