The unit I was selected by shares an airport with a major US airways hub which provided some stiff competition for the FYO4 board. On paper I didn't deserve the slot, hell I haven't even finished college. Some of the things that helped me overcome the odds where showing them that I did something besides lay up in a frat house drunk for the past 3 years. I worked full-time, earned my certificates and ratings, and kept my GPA high. When it comes to the interview, mine was about 30 minutes long. They held the interviews over a 5 day period and I went the first day. Some may argue that is a bad move, but it actually worked out great because it gave me an opportunity to get my thank you letter in the mail and to them before the end of the interviews(later on I was complemented for that by one of the interviewers). Also, I had two difficult questions come up in the interview: would you take a nav slot if not selected for a pilot slot? and what kind of career do you see yourself doing outside the unit?. My answer to the first question was..... " My goal is to be an OFFICER and a PILOT in the Air National Guard. I have invested SO MUCH time, money, and energy into being a pilot, that if that opportunity does not exist right now I would like to be considered later when such an opportunity does exist. In the meantime, I am exploring other avenues of service, but this is my FIRST CHOICE." For the second, one of the board members mention that he was an airline pilot, so I did not hesitate to mention that was what I plan on doing also.
I know this is kind of long but these are some of the important aspects of my interview. BTW this was the only interview I did and I got the unit I wanted.