How much time does this sort of thing take? I'm interested in signing up for the American side, but these sorts of campaigns often have "training sessions" and such that I just can't set aside time for. But if it's just a few hours every Friday - sign me up!
As Papillon said, you're welcome even if you don't have time for the practices once a week. Most of us are adults with real life responsibilities that come first and everyone understands that. Also, you don't have to play the entire duration of the battle or the practice. Personally I like to play as much as possible, because the experience is so much better than pubbie play.
Not sure if Airsharks message had a typo or not - practices are _not_ mandatory, but they can be very helpful and we encourage people to join them as often as possible. If you can't come, then you can't come - just mention a reason why you can't come on the forums and no one thinks badly of you missing a practice or practices.