These two are linked, but when I checked the FAA registry there is no N6204N registered. N6204N profile shows as deregistered. I'm unsure whether the KC-10 ever had a civil registry. At any rate, the correct c/n for the plane is 48310 vs the USAF serial. Perhaps the civil profile can be deleted or if it was once valid, perhaps the c/n could be changed on both.
Glenn