Long Distance Relationship

I am a complete wreck and I have been for the past 3 months. I was dating a amazing girl named Katherine for two months and everything was going good until i moved to where i now live. Not only that i just re-enlisted into the marines which she doesn't like. Its in my blood and that is what I want to do with my life. i really care about her a lot and I want us to work this out even with me going back in. I don't know how to make her see how bad I want this. I know I may be gone for long periods of time and i know that has its effect on things but that's a sacrifice i'm willing to make for my country and me. Happiness is one of the things i prayed for and i found it in her. Please help me out.

Thank you,
Brandon