Recommend you really think about getting a bike before going to NAPS. First, explore insurance costs for a teenage and a bike, you won't like the rates. Second, Newport is a long, rough winter. You will only get a few good riding months before it goes into storage. Third, where do you plan to store it during the winter? Fourth, what will you do with it for four years while at USNA? USNA has a strict no motorcycle policy, that includes leave. This is enforced as much as possible. Motorcycles are not solid investments generally and loose value. There are exceptions to this, yes. But why waste money in your first year of adulthood? You won't be able to ride on base until you attend the motorcycle safety course. The wait to get into these on base can take a few months. Plus as a student they won't let you miss class to attend these. Base is strict on what courses are accepted,have you research what kind of class and plan to take this before going to NAPS or on the weekends there?
I am a rider and have owned bikes while on active duty. I have rode all over the world. Its your choice, but I would highly recommend you table this idea until you graduate from USNA. The risk of injury is there too, don't put yourself at unnecessary risk before you even get in the doors at USNA. NAPS is a great opportunity for those who are offered it. Would recommend you take the year to focus on academics, preparing for USNA and having a ton of fun... but without a bike.