I doubt I have all the facts (or even half of them). However, I spout off what I do know. There is a gun club that meets there. I found them during a Google search about 6 months ago. I also think you have to know someone that's on base there.
So to sum it up you either have to know a insider or join that gun club. I never really went to far with it as the NRA range is less the 15 minutes from my house and this range is about 45 minutes in traffic.
Maybe this will help?