Marriage

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So my boyfriend and I are planning on getting married next September. He is in the Marine Corps so obviously we can’t live together unless we are married. We just got an offer to move in with a couple that we are friends with, but we would have to move in by March. We are talking right now about whether or not we should get legally married and then have the wedding or just wait. We have been together for almost 2 years. What do you ladies recommend? Should we wait or is it worth it to get legally married? Oh also if we can help it we do not want to live on base.