No worries. I did check out the Instant User Guide_6.1.3.1-3.0.0.0.pdf file, and saw something that caught my eye (pages 101-102)...the list of supported VSAs. Of particular interest was the one called Aruba-Admin-Role.
I guess the question is whether or not the RAP 3 supports the RADIUS Server VSAs referenced in the 6.1.3.1 users guide.
I would assume that something on the NPS would have to be configured to deal with those VSAs, but I have no idea on how to create them (read: M$ configuration wizards are a little less than helpful).