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The way the cadets used to work - and I can only go on my experience of being in the ATC 25-odd years ago - is that you paid your weekly subs and this covered the basic costs of running such a venture. The people who then oversaw this did so on a voluntary basis.
As for militarisation, that wasn't the vibe at all. It was actually quite a laugh and the people it attracted were fairly geeky. In some respects, it was little different from the Scouts, but was perceived as being way cooler!
Well, the regular army is under funded - too much emphasis on building aircraft and boats - and I don't see the harm in having cadet groups attached to schools. It's better than going around to schools in deprived areas offering money to kids to join the army, which is what they do actually do in the US.