I have done dozens of official WP Interviews and been on several MOC Boards.
The advice above is very good.
-More advice-you man or may not like this but I am trying to help:
-Dress in a nice suit
-Have a short haircut
-Be clean shaven - no sideburns
-No visible tattoos
-Be positive and look the interviewers in the eyes with a friendly but determined way
-Sit up straight and answer the questions directly
-Convince the interviewer that YOU want to go to WP (not your parents)
-Do not mention WP being a free education as the reason you want to go
-Be prepared to show that you have researched WP and have a great deal of knowledge.
-Mention the great contribution made by WP grads and that you are determined to be a part of the "Long Grey Line"
-Mention that you want to serve your country and that WP - you feel- is the best way to do that.
kfacademy, Dixieland, GoBlue1984: Have any advice on how to answer these challenging questions? Obviously they're quite personal and answers depend on the candidate, but do you mind sharing what you responded with/what you think they want to hear? Thanks!