Selective Service and U.S. Citizenship: Is It Too Late to Register?

Published: May 14, 2026 • Author: Amira Khalil

Selective Service is a common source of confusion in naturalization cases. Many male applicants learn about the requirement only when preparing Form N-400.

In general, many males in the United States must register with Selective Service around age 18 and before turning 26. For naturalization, USCIS may review whether an applicant was required to register and whether failure to register affects eligibility.

Who should pay attention?

This topic may matter if you are:

What if you are already 26 or older?

If you are 26 or older, you generally cannot register late. You may need to request a Status Information Letter from Selective Service or prepare an explanation, depending on your situation.

Why USCIS cares

Selective Service can connect to the requirement of attachment to the Constitution and good moral character. USCIS may ask whether failure to register was knowing and willful.

What documents can help?

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