Tell him they know he is just a kid and that nerves are normal!
If he gets that as a fact, he will be fine.
If he has questions, ask them, but don't ask questions because you think you have to ask questions.
The questions that I have seen asked range from getting to know them to politics. What was the last book you read not assigned to what do you think about ISIS?
It is anybody's guess on what they will ask.
If he wants to fly, he may want to find a way to talk about what made the news yesterday. The F35 completed their first landing aboard a carrier!
~ It can give the interviewer not only his goal, but that he is interested in the Navy news.
~ Same to be said if he can find current events for whatever career path.
~~ IE he wants to be a submariner, maybe he can discuss the integration of women when it comes time for questions....I.e. How are they rejigging the sub's for women's quarters. Make sure he poses it as a structural question....will the sub's need to be decommissioned for a short period? It shows that he is thinking about the future of the Navy and missions.
The key is if he brings these issues up or is asked about his future in the Navy he understands that it is always Service before Self. If he wants to fly, great, but be prepared to answer what if you don't get those wings?
He will be fine. Just remind him that he has had these conversations with you guys. I am sure when he brought up joining the military and applying for the scholarship you talked about it as a family, and why was probably the big topic. He gave you logical reasons to gain your stamp of approval! He already won the hardest people to convince for most people!
~ Bullet was ADAF for 21 yrs. when our DS approached us, you would think we were the easiest to convince. We were the hardest and he still won our support because it was in him to serve and you could see it!