Note: If you signed up for it and later decide not to go, please cancel it also at the above link, so organizers will have a more accurate head count.

注如果报名后有变动，请到上面的连接取消报名，组织者可以有准确的参加人数。

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"There are a number of organisations within militaries - you have active forces, reserve forces, civilians, and also those that might be working as contractors - so it depends really what you're trying to count when you look at headline numbers, " says James Hackett, the editor of Military Balance.

BBC: Which is the world's biggest employer?