Well, we actually don't have 600,000 kids... it's more along the lines of 35
And, although we are made up of 8 different high schools, we have no active teachers on the team, only DuPont engineers and parents. This works because we meet at a DuPont site, so half of the engineers are already where we meet without having to commute, and the rest aren't THAT far away, except for 1-2 exceptions.
Back to the original post, however ,we don't have an application process. Because we show assemblies and wear our jerseys in school, kids know who's on the team and who to talk to if they're interested in joining... most of our recruiting is word-of-mouth (which is how I joined). And as far as who can join... we've never really turned anyone down, although we're coming close because we don't want more than 35 students on the team. If you come, do what is asked, and don't mess around, you're on the team. Most people who don't feel like coming any more just stop; that's how we filter out the uninterested
. Hope that was interesting.