Each year there are threads on this. Look within the individual SA forums. Sometimes you will have better luck with an external Google search with “site.serviceacademyforums.com” in your search string.
Yes, it is possible, but will take maturity, honesty, patience, trust, resourcefulness, independence, advanced communications skills, and many other traits, skills and abilities to keep your relationship strong and growing. At USNA, it’s called the “2% Club,” humorously describing the expected percentage of pre-existing relationships that will survive through 4 years of SA challenges.
You will not have the same freedoms to travel and see each other. Your ability to communicate via text and calls will be severely impacted, with the first test of this being the initial summer training, where phones are taken away. There will be times you as the midshipman or cadet will simply be so busy in the pressure-cooker that is an SA, you won’t be able to respond immediately, or do more than a quick few words in a not-so-instant reply text, or can’t indulge in a half-hour call because you have several mandatory things you must go and do. If you are the types that are in a joined-at-the-hip-can-hardly-be-separated type of pattern, SA life will test this.
Mis-alignment of assumptions and expectations play a huge role in disrupting and derailing relationships, even for people who have been married decades. In every argument or bad spell, you can almost always find some degree of this.
You will have to be brutally honest in setting expectations about an experience you don’t yet know first-hand. Your SO must be able to pursue his or her own dreams, growth, path, and be able to thrive at whatever they are doing, independent of you, while you are doing the same where you are, not unhealthily dependent on each other. People do manage to do this, but it is hard. It takes resilience, trust and mutual respect to grow through this together, but it can be done. It is not the normal college dating experience. It can be very hard to have adult conversations when you’re not seeing each other in the same way you do right now. Assumptions and expectations, every time.
Communicate with each other about assumptions and expectations. Commit to taking it day by day. See how it goes. Put the other’s well-being first. If you know your feelings have changed, don’t play games. There is absolutely no room for jealousy; that is a corrosive element that will erode the foundation of your relationship. You will both change tremendously in the next few years, a normal part of emergence into full adulthood. You have to mutually support each other’s growth and dreams, because this is a true expression of love, understanding that could mean different paths. This isn’t just 4 years away at college, with complete freedom to merge lives afterward. It’s a minimum of at least 9, probably more, and one of you will not have too much control over where you will be and what you will be doing.
Down the road, military spouses are a special breed of people - phenomenally strong, independent, resourceful, resilient. Their own desires for graduate school and career advancement can be severely hampered. The separations continue. They are the ones who run the whole household when the other is deployed for months, take on the burden of getting stuff fixed, handle family problems, deal with the stress and uncertainty, etc. It can be very hard going.
There are those here who survived and grew those SA relationships into lifelong commitments. No doubt they will pop up.