Hey there I haven't heard that it isn't allowed. I'm sure that it would be allowed to technically be "married" although I highly doubt that you would be able to stay within the same campus as him. If you really love him and are ready to commit to him, though; then that shouldn't be a problem. My cousin was married to someone in the army. When he was out of basic-training and was stationed somewhere they moved in together.
Just make sure that you are aware how hard it is going to be, though. Before getting yourself into the situation, you should know exactly what you are getting yourself into. My cousin's marraige wasn't as successful. That doesn't mean that yours won't be; I just don't think that she was old enough to understand the commitment level of a soldier's lifestyle.
Throughout his time as a soldier you are likely to be moved around a lot. Are you comfortable adapting to change? If you are the person who doesn't like to be nomadic, this probably isn't the lifestyle you would desire. Soldiers are constantly sent from here to there. Wherever they are needed is where they will be.
Also, do you mind being alone? The wives of soldiers can be left by themselves for weeks at a time while their husband is out in the war. Are you okay being by yourself while he is working? I know that this is all in the future, but it is something that you should consider if you really are planning on marrying him.
If you love him and are sure that he is the one for you; then you should marry him. Just be ready to wait to be able to live with him, and expecting for him to go away often.
Good luck to you
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Antidisestablishmentarianism.