>Today, anyone can volunteer for military service and (again, if medically cleared) they will get trained up and added to the military. That's not true: the US

>Today, anyone can volunteer for military service and (again, if medically cleared) they will get trained up and added to the military. That's not true: the US military for example won't take you if your IQ is under some threshold (85 IIRC) or if you've been convicted of any but the most innocuous of crimes. If the US finds itself in a major war, those requirements would probably go away, but they've been in place continuously for decades.