Almost all male U.S. citizens, and male aliens living in the United States, who are 18 through 25, are required to register with Selective Service. In a crisis requiring a draft, men would be called in 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 easiest and fastest way to register is on-line through the agency website. Selective Service "mail-back" registration forms are available at any United States Post Office and on the website.

- Website available 24 hours a day, 7 days a week. - Office Hours: Monday - Friday: 9:00am to 5:00pm. Closed on federal holidays.