Had my three interviews last month, be prepared to explain anything you wrote down on the nomination packet you submitted, if you have any correspondence from West Point (LOE, LOA, 3Q) bring it with you. Also bring extra copies of your resume. For my senators, I had two people interview me, 2 Navy Grads for one interview and 2 West Point Grads for the other. For my congressman, I had a panel of three interviewers, one active duty marine, a field force officer, and a retired army. Also memorize the honor code and be able to explain what it means to you. Shake each of their hands when you walk in, and you can never be wrong with a suit. When you ask questions, ask questions that require more than a one word answer, such as how to balance mission priority and platoon safety. Also be able to talk about why you are applying. The worst thing that could happen is you go into the interview and you can't answer why you are even applying. Be confident and respectful, sirs and ma'am when talking to them. I know this is a ramble, but this is me trying to get as much across to you.