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Figure out what interests you first, what would you like to pursue a career in? is this something you would like to do in the Navy and out of the Navy? then look at the official Navy website and see if there's a job that matches your interest. Lastly, talk to friends/family in the Navy and see if what they actually DO for the Navy matches what you initially liked about that career. (I say it like that because in the Navy, you join with the concept of what you enjoy doing, or think you enjoy doing, but you may have additional duties you are or aren't the most fond of) So understand what you're committing to fully.
This is a great statement. Most people who joined the Navy had no clue what they wanted to do. I would first advise you to think about the things you would love to do in your future. Think about the economy and the advancements in technology. When I joined the navy, I had no clue what I wanted to do so I came in undesignated. Being undesignated means you can come in and strike or choose a rate that you have interest in after being exposed to what it is that they do.
For me, I chose a rate that deals with communications and electrician stuff. While I appreciate technology and electronics, I found out later that what I really want to do is work in law enforcement. There is a big difference between working on electronics in the Navy for 15 years and being a police officer or a Lawyer. If I had known what I know now about myself, I would have chosen to be a legalman which is kind of like being a paralegal or a master at arms which is kind of like being a police officer or security guard.
Another thing you may want to do research on is how well is the advancement rate for the career field you choose. It's great if you want to be an Operation Specialist in the Navy, but not so great if they are only advancing you below the average rates compared to other rates in the Navy. The Navy does have a high year tenure policy so you will not be able to stay in if you don't meet those advancement deadlines.