I hope your interview goes well. In today's economy, it's good just to have one! I think that you should check it out, ask questions and find out all you can before make a final decision. Yes, I agree that there are some thing that are going on with our military that I don't like as well, but 1, a job is a job and any good job today is worth taking and 2, industrial work that involves the military will help people too. I mean our soldiers are out there and they do need support. That's just my opinion, though. If you still think that this job is not right for you after you go to the interview, then don't take it. Sometimes having a job you hate is worse than not having one.
Good luck, and I hope you come to a decision that is right for you.