Alliehz gives some good advice. You're going to be talking to middle schoolers so most of them aren't going to be interested in anything that doesn't sound fun. Highlight the activities you do that makes JROTC (I assmue is your group) unique present it as an opportunity to do something completely different in the school enviroment. Don't get too bogged down in talking about the opportunities it can open for you, middle schoolers aren't that interested in what's going to happen to them when they're out of school. But don't not mention them either, just focus more on the "fun" stuff. Kinda like military recruiters, dangle the good bait.
Ut ceteri vivant.