Why are males ages 18-26 expected to register with the Selective Service?

Males ages 18-26 are required to register with the Selective Service in the United States to ensure that the government has a list of potential military conscripts in the event of a national emergency or draft. This registration helps maintain an up-to-date database of eligible individuals who could be called upon to serve in the armed forces if necessary. It is a legal obligation, and failure to register can result in penalties such as fines or ineligibility for certain federal benefits.