SRF? Legends? Who's racing them? Why not us? Explain.

[NTIman]

el o el ...more legends being run over even this past weekend.

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What's the requirement for those guys who run those with NASA? How does one acquire a NASA license for that? Please tell me it's the same process as everyone else not "hey, nice legends car, try not to do anything dumb, but thanks for coming out."