The Italian language is one of your greatest assets in your effort to make this tour fun and rewarding. Without it you are excluding the best avenues to an exhilarating experience. Nothing flatters people more than the knowledge that a foreigner has made an attempt to learn their language. Once you break down the language barrier, you will find a whole new world opens up, ready for your exploration.
You don't need to become a seasoned linguist to be understood. No matter how fractured your Italian, the host will be patient and appreciative of your attempts. You will be more successful in any situation—shopping, traveling, meeting neighbors—if you try to speak Italian. Although you will usually find someone who speaks English in the larger city shops, those who insist on always seeking out someone who speaks English not only will irritate and alienate, but will constantly feel insecure and frustrated.
Language courses are available to those assigned to Naples. Check in with the Navy College Office upon arrival, and the staff can help you choose a course that best fits your needs. A pocket dictionary or phrase book can be a valuable tool to acquire before your arrival. A basic familiarity with words and phrases will make your transition into the local community much easier. If you can take a formal course or check out some language cassettes from your local library, you will certainly benefit from this investment in language training.