My district had about 50 people interviewed for USNA, USMA, and USAFA. However I would say that many people were there for USNA, maybe half or more? I didn't think that it was that intensely competitive in general unless you were applying for USNA (I did USMA and got the principal). I was extremely happy hearing back from them because I don't consider myself top-notch... I'm just a B average student, but am very involved with sports inside and outside of school and I think that helped. I brought my resume with me and my interview was more about talking about me rather than them drilling me with questions. Also, only 3 or 4 girls interviewed in my district (including me).