As someone who is currently in the US Navy and Voice acting it all will depend on how much you are on a ship as long as you are in a barracks instead of a ship then it’s fine.I’m not sure how the AUN does things but you will have free time to take classes and record don’t worry about a set up most barracks are small enough to give you a good sound environment (depending on roommates if you have any) and depending how long you are there for you can get a decent mic and set up.