The first question I got was: "Now, it's quite obvious that you are an accomplished individual with many successes in life. Tell me, what is your greatest shortcoming, failure, or weakness?"
Then they asked me some basic questions about my grades, classes, my preparation plan for Plebe Summer, my PRT and CFA scores, my extra-curriculars, etc.
They told me my essay was great, but I did not specifically mention a desired service selection. I told them I wanted to go nuclear submarines.
The submarine officer on the interview board immediately lit up and began a battery of ethical questions relating to the nuclear field and the Navy. Some were hypothetical, some were centered around historical and current events, and some were about the nuclear program itself.
"What do you think about Fukushima? Could something have been done to prevent that disaster?"
"Do you know what will happen after you graduate from the Academy? What do you know about Nuclear Power School? Why do you think every Ensign must be interviewed and selected by a four-star Admiral before attending Nuclear Power School?"
"Tell me about your family. I noticed you put your ethnicity as "Chinese," but your parents are from Taiwan. Do you speak Chinese? What do you think of the Navy's current role in the Taiwan Strait and Seventh Fleet area of operations? If Taiwan and China were to go to war with each other, which side would you take? Which side do you think the United States and the U.S. Navy should take?"
It wasn't an easy interview because of those ethical questions where there is no straight and narrow answer. Some of those questions were a lose-lose situation where any response could be seen as poor (Like the Taiwan vs. China questions). Be prepared for hard ethical questions, political questions, current events questions, and do plenty of research on your desired service selection. Know enough about the Naval Academy and the Navy/Marine Corps to know what they're talking about when they use specific terms like "Prototype," "Pacific Fleet," "PROTRAMID," etc.