Final answer:
Under the Selective Service Act, nine thousand men aged twenty to thirty-six had to register for the draft, which meant they could be called up for military service. The Selective Service System managed this process and, while there is no draft today, registration is still required for U.S. males aged eighteen to twenty-five.
Step-by-step explanation:
Under the terms of the Selective Service Act, nine thousand men aged twenty to thirty-six had to register for the draft. As the legal framework for conscription, the Act initially required all men aged twenty-one through thirty to partake in this process, expanding later to include ages eighteen through forty-five. With the Selective Service System in place, it was a duty for all eligible males to potentially serve in the military if called upon.
Local draft boards managed registrations and enforced the Act. During both World Wars and other conflicts like Vietnam, the draft system was implemented, with men categorized by criteria including physical fitness and marital status. Even in peacetime, registration with the Selective Service System remains a legal obligation for young men in the United States, with the modern requirement capturing those between the ages of eighteen and twenty-five.