Lots of good responses on here.
I've had more than a few relationships fall apart on the basis of my job. It's no big deal. The first one hurts, but after that, you start to see a pattern, and can pretty easily pick up on who has potential for a second interview and who should be kicked to the curb.
The important thing to remember is that if you take on a girlfriend, if you let her make decisions for you when you are young, you are not in a relationship, you are a subordinate. Women try to control you through the witholding of certain things/activities, manipulating your moods and trying to separate you from your life (friends etc.) before them. These "bad" women resent the military because it represents a whole world that they have no knowledge of, no control over, and it scares them.
You need a woman (not a girl) who has her own life (job, friends, car, family etc.), then you can look at having your lives co-exist. Her life is not yours, and vice versa.
If this one is showing her true, manipulative colors now, imagine what she'll be like in 10-15 years.
There's plenty of females out there. Make sure you play the field enough when you are young, so when you do get married, there will be no "I wish I had..."