Had mine today. Went really well, felt comfortable the whole time. I spent about 40 mins talking about myself and family since things are differant back home to the UK and took a while to explain it all. One question that threw me off guard was "what was the lowest part of your life"
5 mins were spent on Royal Marine : Things asked were Corps birthdate, describe the corps badge name the commando units, what did i know about my chosen specialization, how long do you sign on for when joining the Royal Marines, what is the minimum amount of time you have to serve as a Royal Marine, how many weeks training does it take, have i seen the cockleshell heroes? then some questions about it (absolute laugh).
Chatted for 10 mins or so about the navy, in particular the new class 23 frigate, HMS Ocean and harriers and which followed me asking some general questions about the forces.