> What's to stop parents afraid of vaccinations from taking their draft-age children to New Zealand? This reminds me of something a friend of mine told me over

> What's to stop parents afraid of vaccinations from taking their draft-age children to New Zealand? This reminds me of something a friend of mine told me over Christmas: Her 65-year-old uncle is not currently allowed to travel abroad from Ukraine because 25 years ago he was an Army officer and anyone with military experience is being held in reserve. So the answer to your question is simply "police at the borders".