They send cuttings, tho on the BN thread some report rhizomes, with instructions how to grow them.https://www.ars.usda.gov/sp2UserFiles/Place/53581500/distribution/Plant%20Distribution%20Frequently%20Asked%20Questi ons.mht
Research reqirements requested are available on the website...takes some searching, and I don't remember where it was.
But it was something like 3-5 years for research, send them your results and notes.
Research could include 'would like to test endurance to cold weather winters and the resulting affect on yields and quality' (kinda what I used for Japanese and Chinese hops requested: Sorachi Ace, Shinsuwashi, Kirin II, Kitamidori).
Or 'study effects of hemisphere change and cold weather winters on resulting yields and quality' (which is what I'm using to request New Zealand and Australian hops next year: Pride Of Ringwood, Pacific Gem, Smoothcone, AlphAroma).
Don't expect 100% success with your cuttings, as I received only one of each, and managed to kill half of them, but hey .500 is AWESOME in baseball!