Not trying to discourage you. The truth is, some relationships started before the academy hold strong and work out. Some don't.
Quick story about my son when he went to the academy. He was still dating his high school sweetheart. Only living 2 hours from the academy, he came home for long weekends, holidays, spring break, summer, etc. he basically spent his free time seeing her.
After his first year at the academy, she transferred her college to attend UCCS. Universit of Colorado in Colorado Springs. She got an apartment, went to school, he attended the academy, and he spent pretty much all of his free time with her. After about another year and a half, just before Christmas, I think he realized that the academy "EXPERIENCE" was more than just going to college. He realized that he was missing out on a lot of adventures with his classmates. When they got together for a free weekend, he didn't go. He was with his girlfriend. If they went skiing, he wasn't with them. If they wanted to hang out on a weekend, he wasn't there. He discovered that he wasn't developing the friendships and closeness with his classmates that he saw others doing. In time, it came between him and his girlfriend. As such, they broke up. He then spent his weekends with his classmates, building friendships, studying more, going away on weekends with his friends, etc. he was much happier. He excelled academically and graduated #7 in his class. Got accepted to grad school, and just finished his PhD 2 days ago. Finished his masters degree last year.
This is not meant to say that your relationship can't work. Simply saying that you need to let your girlfriend experience the entire Air Force academy life. Just like you need to experience your college life. Arrange to see each other during holidays, spring and summer breaks, and maybe even the occasional long weekend. But if you move there and try to take up her time away from the academy, there's a good chance it will come between the two of you. I've seen some academy grads marry their high school sweethearts after graduation. But they didn't both live in Colorado Springs. They allowed each other to experience their college life and they let nature take its course and saw how they felt after graduation. It's not like she's going to get married in the next 3 years.
So I agree, like others, that moving to Colorado Springs is a very bad idea. Not saying it can't work, but it will take away from both of you the experiences that you should be having with your respected lives. And it could come between the two of you. Best of luck.