An applicant for naturalization after three years of marriage to a U.S. citizen must meet the following citizenship requirements:
Alternative Paths to Citizenship
5-Year Permanent Resident
If you've been a permanent resident for at least five years, you may be eligible to naturalize now.

U.S. Armed Forces
If you've served at least one year in the U.S. Armed Forces, you may be eligible to naturalize now.
Form N-400, Application for Naturalization
* Data based on USCIS Forms Data and Lockbox Rejection Data.
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