Thank you for the information and your question. If you are asking if your fiance would be violating military law
by marrying you because you are 17, then the answer is no. As long as your relationship is legal in the State where you are married, which it is, then it is legal. In addition, even if you were not married, under the UCMJ "carnal knowledge", which is the military equivalent of statutory rape
only applies to children under 16 years of age. You are considered emancipated (an adult) when you marry, so that is not an issue either.
Might someone tease him or give him a hard time from an interpersonal perspective, maybe. Because of your age, they might, but that isn't anything that will affect his career or get him in trouble. He can just ignore that, like others do when people kid them about stupid things, and stick to his job.
Please let me know if you need any clarification. I would be glad to assist you further if I can.