Yeah roger, I was specifically instructed NOT to bring them, but yes its just like any other interview. Everyone, myself included, was in suit and tie or similar.
You'll wait around in a reception area till you're called and provided yours runs the same as mine did you will be interviewed twice, once by an OIC (LT) and then by the commander and XO of the unit. The OIC interview was a bit more relaxed and asked other questions relating to where I saw the next potential threats around the globe and also random questions such as "If the clock shows the hour hand at X and the minute hand at Y, what would the angle formed between them be?"