Rocket Lab USA is the same Rocket Lab in New Zealand.
The Dash 80 prototype was neither a 707 nor a KC-135 but a platform to kick off both programs.
Same price; better performance. May not be compelling but I would choose it. Still, they need to prove they can do it.
Can someone explain why this better than the 'Prandtl d' that NASA developed for a lot less money?
For launching from the Moon, don't overlook the mag rail gun.