I applied through university. The process took 1 week. I interviewed at AZStRUT (Mesa, AZ) in May 2017
Interview
Asked what related coursework we have had (electronic repair and refurbishing) then told us what was expected of us volunteers. It was a group interview and it seemed they just needed people.
Interview questions [1]
Question 1
They asked how we would properly reset a computer for refurbishing that respected their contractors privacy.