noun
an agency of the United States government that maintains information on men who are available for military service in case of a national emergency
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The selective service system requires all male U.S. citizens to register when they turn 18.
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Hey, did you remember to sign up for selective service when you turned 18?
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I totally forgot about that selective service thing, oops!
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Signing up for selective service is like a rite of passage for young men in the United States.