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What you will be able to do after the military will depend both on the skills and experiences that you bring to the table as well as your natural interests and abilities. If you are one of those fortunate individuals who have a strong sense of the type of career; i.e., mechanical, sales or research that you would like to pursue then selecting a supporting college degree and trying to find a military job that uses similar skills will prepare you for the civilian sector.
Even if you don't know what you want to do, a college degree will demonstrate that you can stick to a task until finished while the military will improve your maturity and ability to accept and manage responsibility.
Achieving a high rank or grade is not a quick process and is usually associated with a full term military career which may well be much longer than you are willing to spend in this phase of your experience building. Also, unless you have specific skills such as; law enforcement, computer systems, aircraft repair and such when you come out of the military you may find that your time served is only received with a polite nod by employers. Being just another veteran will be a factor in your favor but, skills and ability will win the position.
There are excellent opportunities for careers after the military for those that select a branch in a technical field. Doctors, Lawyers, Signal, Military Intelligence, Logistics, Military Police are all great fields that have a large civilian workforce. Like George Paige said its important to think about what you may want to do in and out of the military and pick a major that may be applicable to the branch you want to select. The military will provide the opportunity to build your experience, leadership, responsibility. Along the way you will also meet mentors and network with people that will help you later in life.