No, SCOTUS does not have the authority to federalize the military. Trump did - EO 13912
You might like this guy too. He is not as in depth as the Badlands writer, but he touches on more topics
https://www.coffeeandcovid.com/p/succeeding-backwards-monday-august?utm_medium=email
Registered Nurses are not certified - a degree is required. Then the candidate takes the licensing exam (NCLEX.) I don't think there's a standard GPA for passing the degree program. The NCLEX is graded on an algorithm, so there's not really an answer to that either.
Was it 2021?