It's TL-6.5, mostly.
Fold-down wingtips and underslung engines, riding on the engine inlet shockwave -- these are a straight rip from the North American Aviation XB-70. (Wikipedia)
Flew in 1964.
Not that this is a bad thing, mind you.
One of the prototypes was destroyed in a collision with a chase plane. Project was cancelled because the paradigm of "fly so fast and high they can't track or hit you" (valid up through the early Jet Age) became obsolete.