gbritto - invest some time online researching primary sources, and build up some general knowledge.
The entire point of obtaining a commission via service academy, ROTC or OCS/OTS is to serve a minimum number of obligated service years. Figure out what you want to do as an officer, then work backwards to find your path.
http://www.navy.mil/index.asp
http://www.popularmechanics.com/military/navy-ships/a15297/us-navy-entire-fleet/
Simple research could produce number/types of ships, subs, aircraft, etc., plus typical crew size and numbers of officers assigned. It will quickly become obvious that navies everywhere are a water-based service, which means surface ships, which typically means larger crews and more officers assigned.
All services have similar sites with info on Intel officer communities/branches/specialties.
Intel officers perform a highly specialized function, so you find them in small quantities where their function is needed. Overall, they are a smaller community of officers, in all services. Thus, the path to get there may not be as direct.
Researching Navy officer - or any service - communities will help you learn about their roles and assignments. Asking random questions on a public forum may not be your most effective approach. The officer aspirant should be a self-starter who does the baseline work to be able to make an informed decision.