I had my USMA interview and I imagine the USNA interview will be similar. Like everyone else said it is more like a conversation but still make sure to dress nice, have a firm handshake, don’t slouch, ect.. Make sure to either email a transcript and Resume or bring a paper copy (I did both). Also in your conversation make sure to share what isn’t found in your application because that interview is your chance to tell admissions through the report the BGO writes. My interviewer specially seemed interested in challenges and hardships in my life and activities that I could share more about. For instance, I had no sports participation my junior and senior year. It also gave me the chance to talk a lot more about what I did in clubs not just the leadership positions on paper.