When must all men register for the Selective Service? 所有男性到了哪个年龄必须注册「兵役登记」？

• at any age 任何年龄
• at age sixteen (16) 十六岁
• men do not have to register 男性无需注册「兵役登记」
• between eighteen (18) and twenty-six (26) 十八 (18) 岁至二十六 (26) 岁之间-

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