As for the army vacation camp, I think it's good experience (same with scouting for example), although there's probably a huge recruitment angle there.
Personally I wouldn't mind a stint in the military, but at the same time I'm nearly 40 and not exactly fit if you catch my drift. That said, the military is also looking for a lot of reservists, people who do some jobs outside of their day job, some in IT security, base guarding, that kind of thing.
I tried to sign up as a reservist - civil personell - because I feel like my logistic expertise could come in handy but sadly I passed 40 a few years ago and I'm deemed to old for service, even as a reservist.