Pros
When I went to work for the Navy, my main reasoning other than the educational opportunities, the training, hands on experience, and pride, was the opportunity to travel and see the world. Since becoming a Sailor I've been to Australia six times. Hawaii 12 times, Japan, China, Hong Kong, Singapore, Guam, Bali, Thailand, Dubai, Oman, Mexico, the Bahamas, and 40 states. The financial opportunities have been outstanding. I'm making more money than I ever expected, and have the job security that very few of my peers can match.
Cons
Obvious downside is being away from home for extended periods of time. I don't want to make it sound like you're out all the time, you could always count on traveling around the globe for six months, once every three years. Other times you may go out to sea for three-four weeks and still visit different cities along the various coasts. All in all, I'm proud to serve and the sacrifice is paid back by being able to see and travel numerous countries.