It's hard to believe it, but it's been a year since the last interview season...
I applied last year as a matriculating M1, and interviewed in Cleveland in May. I left the interview feeling VERY good about things, but alas, when August rolled around I got the axe and no scholarship for me. I've been told that as a matriculating med student, your chances for the scholarship are at a slight disadvantage because they aren't 100% sure that you have had the experience in medicine enough to know that you can promise primary care. If you've had a year or two of medical school under your belt, you might be more likely to know for sure that primary care is your cup of tea. I'm not sure whether or not I believe that philosophy or whether or not NHSC really does give a rat's bottom whether or not you are a M0 or M1 or M2 or PA0 or PA1 etc etc but that's just what I was told by a few people.
Now, a year later, and almost a year of school under my belt, I am applying again, with an even greater determination that this program is suited for me. After a year of school, I am even more interested in primary care and even more interested in the underserved populations of the US.
I echo everything everyone else said about the interviews being very canned and sterile. They are hired interviewers who have specific things they are looking for, so they won't be impressed or touched by your stories about your experiences. They will, however, put a checkmark in the category that NHSC is looking for if your story touches on a particular interest they want. So don't feel bad if they aren't smiling or laughing etc. Their job is to take notes and then formulate your answers into some sort of scoring system to see how good of a fit you are for the program.
If you do your research on SDN, you will find that people have listed some types of questions they ask you. Be prepared. Don't have word for word answers, but try not to be unprepared and have no clue how to answer their questions. They are all very "answerable" questions... just take some creativity and insight while still maintaining your ability to point out aspects about you that would really suit rural/urban underserved team emphasized healthcare.
So that said... time to prepare myself for another interview in May... hope this one is enough to assure them of my desire to serve.
Good luck everyone!
Scott