I'd semi-second what ToD says. I do a lot of 'Outdoors Ed' type stuff with a lot of different organisations, the Air Cadets being one of them. Before I'll commit to working with any of them I always make sure I go along, have a chat with whoever is working for the unit that I'll be working with and make damn sure I can work with them! If you're giving up your free time, you have to want to do it, and with the best will in the world, if you can't stand the folk that are there already, you're not going to enjoy the experience and as a result you'll short-change the kids.
The solution to not getting along with them is to try another unit, as there's almost always a few locally, unless you're really out in the sticks!