The configuration of the Lockheed HTV-3X Blackswift project has changed several times... The one you're showing has replaced the earlier twin-fin designs (themselves evolved from the HTV Falcon) and is described in several places as the "final" one.
Thanks, Stephane, I searched for it there, even went fishing for it in patents, but found nothing (there is a patent for the latest Blackswift in this site)
I even have the DARPA Video from NatGeo which is the source for the tunnel model you posted
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