Carl,

I never really thought of the US Army as a large force prior to WWI. I was wrong to use the term "draft" since it has a specific meaning. Volunteer would have been better. I have always had the misconception that it was a small force (15-20K) that grew as needed to deal with specific situations (the civil war, the Indian wars). I never really thought of them as occupying anything outside of the America's other than the Philippines until the twentieth century with the Philippines being their only real occupation experience.