This is XF-91 46-680 marked as XF-91 46-681. It is unknown why the USAF Museum had the wrong serial number on the a/c. 46-680 was delivered to the museum in 1955. When displayed later at the new museum it had the correct s/n on the vertical fin. This slide was taken at the outdoor aircraft display area at the old museum on Patterson AFB. It is still part of the museum collection but as of 2022 it is in storage according to the museum website.