Glad to hear you got in contact with them, hopefully you will get the tour rather than email addresses. Regardless of how you get in contact with them make sure you ask lots of questions about the good side and bad side of the trade you are interested in. People are very willing to talk about the good but forget to mention the bad. I am an ammo tech and I am amazed at how many times I have heard ammo techs tell people we blow stuff up like that is the main function of our job, unfortunately it is only a small part of the job so it paints a false picture.
If you get the tour ask people for their email address and if they would mind if you contact them again if you think of questions after the fact, I am sure you will think of a few.