The main responsibility of the Selective Service System is to select people for military service.
Explanation:
The Selective Service System (SSS) is an independent agency of the United States government that maintains information on those potentially subject to military conscription.
The main responsibility of the Selective Service Act (1917) was to make sure that when the country goes to war, it has enough troops to win.
They developed Trigonometry, used mathematical models to track down the planet Jupiter and developed methods of tracking time that are still used today.
According to the source, the answer to this question is conscientiousness. Meaning that as people grow up they become more careful and perceive risks in their actions.
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They wanted to set rules for the people, the power may be the peoples' but they needed to set "ground rules". Like owning a house, its your house but you give yourself some rules.
