Don't listen to Jake. He has no clue about the navy.
Yes you can change your job in the Navy (We don't call them MOS in the Navy Jake, they are called Rates)
It is Difficult to do and Navy rates are devided into three CREO ratings depending on manpower levels. A CREO I classified rate is critically undermanned and there would be little trouble transferring INTO that rate but trying to transfer OUT of that rate would be hard. A CREO III rating would be critically OVERmanned and a transfer out of that rate would be easy. Also in a overmanned rate, Advancement will be more difficult because of the lack of open billets.
Pros and Con about the Navy.
depends on if you are married with a family or single. and what your goals are.
PRO: The Navy will allow you to travel and see more of the world than any other branch of service. On a typical six month deployment, you will visit about 6 to 10 overseas ports for 3-5 days at a time. When you deploy with another Branch of service you will be stationed overseas longer, 1 to 3 years, but will be stationed ONLY in that one country. Any travelling to neighboring countries will be done on your own time and money.
CON: You will be gone most of the time (not really a con if you are single, but for a Married member with family this is a very bad Con. Typical (peacetime) schedual is this... 6 months deployed overseas, back home for a year and a half. during the year and a half back, part of it will be in the yards doing repairs and upkeep (it will be like a typical 9-5 job except duty days) and the rest will be training for the next 6 month deployment. ( during this time you will be gone a LOT just offshore in training. so it total for the 2 year period you will be home maybe 10 months of it.
PRO: During wartime the Navy is the Safest branch to serve in from a Combat point of view. except for certain rates (jobs) you will hardly if ever see combat. The Marines do not have their own medical personnel. All those wounded Marines screaming "CORPSMAN!!" in the movies...are screaming for a NAVY medical corpsman.
CON: During peacetime the danger level of the other branches drop (due to a lack of combat) to a level lower than the Navy. The US Navy operates the same way in peace or war. The dangers involved in operating ships at sea don't change. Being a crewmember on the deck of an Aircraft Carrier is THE MOST DANGEROUS job in the USA. But these are dangers that are mitigated by training and smarts. you keep your head about you, know your job, and most importantly, PAY ATTENTION TO DETAIL. and you will be safe.
PRO: Least physically intensive. No running 15 miles with an 80 lb backpack like in the Army or Marines. Physical training in the navy is little more than what you were used to back in high school Gym class. Sit-ups, Push-ups, Jumping Jacks, etc... and a 1.5 mile run that depending on your age group you will have something over 9 minutes to just under 15 minutes to complete. You DO need to learn to swim though, and learn to tread water.
PRO: High Tech. Nearly everything in the Navy nowadays is high tech. Even engineroom snipes operated in something more akin to a starships engine room than the old hellfire boiler rooms of old. Most of our combattant ships today operate gas turbine engines or (in the case of Carriers) are nuclear powered. Even if you are in a low tech job (A cook for example) you will be around the high tech. When the ships takes part in a Missile test , you will be right there to see it. A cook in the Air Force may hear about it if he has a friend who works in the officers club and happens to overhear the pilots talking about it. LOL.
To sum up:
The Navy is not very good for those with Families, there is a LOT of forced absences and time apart. Divorce rates is the Navy are higher than any other branch. But for a single guy who wants to travel and see the world, loves to see military high tech in action. loves ships and the sea. looking for adventure (with a low risk of direct combat)... the Navy is THE PLACE to be.
So far you have heard from the Airforce, An Idiot, Army, Marine, and Now the Navy. Look good and close at ALL Branches of Military Service. Each have their good and bad points. and what is good for one person is not the same for another. Talk to each of the recruiters. Look into yourself and decide what you want to get out of your time in the service. and then decide.
Good luck in whatever you choose.
I have seen in my time in the Navy.
Hawaii (Pearl Harbor , Oahu)
U.A.E. (Abu Dhabi, Dubai, Jebel Ali)
Hong Kong (multiple visits)
Phillipines ( Olongapo City.. those who know, KNOW <grin>)
Japan (Sasebo, Nagasaki, Yokosuka, Yokahama, Shinjiku, Tokyo)
the only two real navy guys to respond are both from sister ships during the same time period (Desert Storm)
Leahy Class Missile Cruisers
USS Richmond K Turner CG-20
USS Halsey CG-23
DAMNED SHAME what they did to them and the Belknap Cruisers in '94-'95
Desert Storm/Southern Watch
USS Halsey CG-23
USS Kitty Hawk CV-63