>>212048413 (OP)All draft eligible American men have to register with Selective Service. That’s men between the ages of 18 and 25, inclusive.
The last time Selective Service ran a draft was during the Vietnam War in 1973. They ran a lottery where all 366 birthdays were drawn at random order. Whichever birthdays were drawn early in the lottery, those people got letters ordering them to report to a processing station. At the processing station they were rated for their fitness for duty based on weight, eyesight, mental health, things like that. Then they’d get a letter saying I’d they were fit or not, and they had 10 days to appeal (or to ask for an exemption because they were a college student or something like that.)
The people who were fit for service would then receive inductment letters, telling them to report to their local processing station to be inducted into the armed forces.