BigBill and others,
First... good for you for wanting to be prepared. Here are some things you may want to keep in mind for ROTC/SA interviews:
1) Behavorial Interviewing is the most common form of interview question. Basically this means asking the candidate to share a past situation that indicates how they might do in the future. Eg "Tell me about a time when you had to juggle different time committments..." to see if you can multi-task.
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TIP: Sit down and think of several examples of different things you've done in your life/career. Then make a list of the "skills" each of those experiences allowed you to develop or showcase.
2) Biggest X or Most Important Y are also common interview questions. Sometimes these really are important questions, however sometimes they are just tossed out by interviewers to get you to talk and find out what YOU believe is important.
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TIP: First don't be intimidated by these questions; there is no "wrong" answer. Second, prepare by focusing on your strengths, or areas you believe you will shine and then list 2 reasons (no more, no less) why you feel you are strong or they are important. Note: Offering two different rationale shows you've put a lot of thought into the topic; that is one of the big keys to mastering this sort of question.
3) Weakness or Failure questions often scare folks. They shouldn't if you handle them appropriately. The interviewer is looking for your ability to be self-reflective, honest and how you learn/grow as a result of tough experiences.
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TIP: The key here is to be honest (of course) but do not dwell overlong on the negative. Instead after showing some humility, turn the conversation to what you learned or how you would handle it differently in the future; that is where you want to spend your time. Focusing on how you will be better prepared next time is the winning strategy here.
4) Asking for your questions is pretty standard during an interview. Yes the interviewer is trying to be helpful, but they are also looking to guage your level of insight and thoughtfullness around the topic. Eg Someone considering a 9 year+ committment to the military, probably shouldn't be asking if they have to wear a uniform!
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TIP: This is perhaps the easiest part of the interview to prepare for as you are in control. Prepare at least 2-3 "open ended" questions that require the interviewer to offer their own insights as opposed to easy "closed ended" questions that can be answered with a y/n, a number, or simple statement. Eg "What challenges will I face as a woman starting my military career in ROTC?" vs "Is it harder for a girl in the Army?"
5) The surprise question, or any time you are caught off guard and aren't fully prepared. This is the dreaded moment for most interviewees, but if you master it you will win the day!
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TIP: Try this simple 3-step strategy... Take a deliberate breath, praisie the question, and then rephrase it. Eg "What a great question, thanks for challening me with that. You are asking how I would deal with.... " This will buy you a moment to calm your nerves and collect your thoughts. Often too, the interviewer will then give you even more time to think, or tip their hand, by restating your restatement! When you do finally answer, be honest and let them know you haven't thought about it in "exactly those terms" but that your first thoughts are X and Y. This approach shows humility, integrity, and thoughtfullness balanced against the ability to think on your feet.
Summary... Be honest, prepare by relating experiences / stories that you can articulate clearly, consider which characteristics those stories can be applied to, and most importantly... Do all of that so you can be yourself and the true you comes through; that's who they want to meet.
Good luck!