We have a unique requirement for our military though, they are expected to kill people we don't like, or might not like, or who just are unfortunate enough to be sitting on our oil. We have people (often less than 10, who are 'advisers') in 150 countries around the world, more than 369,000 of the 1,580,255 active-duty personnel are serving outside the United States and its territories. I don't know of any other nation that has over 20% of their military outside the country itself.