Just a little tip if I may,
Apart from knowing your stuff about bases and training, lifestyle, and aircraft, there is one more thing that could help. I've been through more than my share of shrinks as I worked through various hold-ups in my recruiting process, and I realised one thing about them. These guys look at nervous, freckle-faced wannabe's all day, and probe them for better or worse. I've talked to a lot of people who have said the psych absolutely grilled them, but my experience with the various psychs has not shown me this side to them. You see, if you are the one person that day to make them smile (you dont HAVE to be a comedian to achieve this, just be polite and smile yourself), they might just think twice before glaring down on you, instead preferring to assume the better of you. They are, after all, human. And the exchange could be far more pleasant, with ice broken and all.
Then again, when it got to the OSB, it got a lot harder to relax...