Who Must Register with Selective Service. Almost all men age 18-25 who are U.S. citizens or are immigrants living in the U.S. are required to register with Selective Service. Citizens must register within 30 days of turning 18. Immigrants must register within 30 days of arriving in the U.S.

Do you automatically get registered Selective Service?

Almost all male US 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.

How do you register for Selective Service when you turn 18?

How can I register? Men 18-25 can register online with a valid SSN, by using our printable registration form, or by completing a form (SSS Form 1) at the post office. Once a man turns 26, he is no longer able to register.