I had an interview last month and here are the questions I remember although most of it's a blur: 
 
- Tell us about yourself. 
- How did you get started in aviation? 
- Why the Air Force? Why the Guard? Why this unit in particular? 
- You realize that you will be deployed. How do you feel about this? 
- What is your biggest strength/turn your biggest weakness into a strength. 
- What is your leadership style? 
- Tell us the 3 most important characteristics of a leader. 
- What is the biggest obstacle you have overcome? 
- Tell us about a time you had a disagreement with a supervisor. 
- You're about to fly a mission and you smell alcohol on the other pilot's breath. What do you do? 
- Again, why this unit? 
- Do you have any questions? 
- Why should we hire you? Make your case. Go. 
 
It was intimidating to have 6+ people in flight suits staring at you and analyzing your every word, especially if you've never interviewed this way before, but be confident. Most importantly be yourself (you've heard this a million times because it's TRUE!) Hey, they decided I was worthy of being picked up so I must have done something right. You can only prepare so much. I may not have had the best answers but I made it absolutely clear that I wanted it more than anyone else and that I have a passion for flying (dur). Good luck!