Von Braun?
Don’t kid yourself.
Yes, he passed on knowledge from his V-2 days.
But he admitted that he got a lot of his smarts from American Paul Goddard.
And don’t kid yourself in thinking he designed the still unmatched Saturn F1 rocket engines and a lot of the Apollo subsystems.
That was done by scores of hard working American engineers, most in their twenties, solving one problem after another.
Remember Apollo 13?
Didn’t see many of them genius Indian H-1Bers there, did you?