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The Selective service System is an independent agency within the Executive Branch of the U.S. Federal Government. Selective service is not part of the Department of Defense.
Almost all male U.S. citizens and male immigrants, who are 18 through 25, are required to register with Selective Service.
It’s important to know that even though he is registered, a man will not automatically be inducted into the military. In a crisis requiring a draft, men would be called in a sequence determined by random lottery number and year of birth. Then, they would be examined for mental, physical, and moral fitness by the military before being deferred or exempted from military service or inducted into the Armed Forces.
The U.S. Selective Service website has more information, including how to register and who must register.
The Department of Defense provides the military forces needed to deter war and ensure our nation's security.