I applied online. The process took 3 months. I interviewed at Indiana National Guard (Camp Atterbury, IN) in Jan 2010
Interview
I first had to sign some documents that would allow a credit check. Afterwards, I was led to a conference room. There was an interview board involving three people, including my supervisor. Each had a list of questions that they would ask me. The interview was temporarily interrupted when the supervisor had to leave for about twenty minutes, which I found unusual.