The permit to fish on-base is $10/year, or at least it was last time I had one, which was a while back, 2005 I think. Plus, you have to tell them exactly where you're going to be fishing, and when. If you want to go try a different lake, you need to go tell the guards at the gate. And your vehicle is going to be thoroughly searched entering the base, and possibly when leaving. Not a big deal, but it takes a few minutes. Personally, I don't think the fishing there is good enough to be worth the trouble.