What is this delta wing aircraft parked at NASA Ames Research Center at Moffett Field?
It is a STOVL E-7 Model.. It is not an actual aircraft.
https://artsandculture.google.com/asset/e-7-stovl-fighter-model-testing-in-ames-40x80ft-wind-tunnel-tom-trower/RQEHhSh_zF3TuQ?ms=%7B%22x%22%3A0.5%2C%22y%22%3A0.5%2C%22z%22%3A9.425586796493714%2C%22size%22%3A%7B%22width%22%3A1.2166568742655705%2C%22height%22%3A1.2375000000000007%7D%7D

The enlarged photo shows the inlet duct covers. It looks like they left the lifting cables just laying on top. This is a model that never flew.