My wife was totally against it and she still is even though in less than two weeks he gets to find out what plane he is going to fly in the Air Force. That said, both of us support him in anything he wants to do. My wife cried more (joy) during his commissioning ceremony than when he graduated. He mentioned he wanted to join AFrotc prior to leaving for school. My wife was totally against it but she knew that going against it would only push him into it so it was my job to stop him. I never told him he shouldnt do it but I did tell him he should finish freshman year and then join if interested. Of course he didnt listen and joined anyway. The thing is that we could have technically stopped him by threatening to cut off paying for his school but that is something we could never do as education always comes first. His major wasnt going to allow him to have a scholarship and honestly his grades were good but not great so he wasnt going to pay for school by going trhough Rotc. In the end, unless your parents decide to cut you off, they really have no control if you go through Rotc or not. I would try to explain to them why you want to do so and try to deal with their worries but in the end you should do what you want. Sure they have the financial means to stop you, but assuming that doesnt happen, respectly tell them what you are going to do and hope they will get on board later down the line.