My girlfriend has a low drive?

I am 20 years old and recently returned from my 2nd deployment. I had a 7 month deployment in Iraq and just got back from a 13 month deployment to Afghanistan. I have been with my girl since i was 17 and been in the army since i was 18. So me and my girlfriend who i love very much have made it through several long deployments which i can say most couples are age cant do. So i really believe we have something special here. We are perfectly happy except for our ual needs are on different scales. I have spent months in the worst conditions and terrain in the world, been shot at countless times, and have had to take the lives of my enemy in order to protect my country. But i come back after 13 long months of not seeing her and i get no lovin. Yes i was happy to see her and i missed her so much and i dont believe a relationship should be all about . And i feel like a bad person for asking her all the time for it cause she says stuff like "isnt being with me enough?" and other comments of that nature. A lot of my buddies tell me if she doesnt "put out" then just dump her, but thats not what kind of person i am. I just want to be able to get her to like as much as i do. We use to do it alot, like before i left for my tours and stuff. But since ive been back it hasnt happened yet. Thoughts?