A little bit of info i found.
Applicants Under 26 Years of Age:
A man under 26 years of age who refuses to register for Selective Service cannot demonstrate that he is eligible for naturalization. Every male naturalization applicant under 26 years of age must provide evidence of registration for Selective Service. The examination of a naturalization application filed by a man under 26 years of age who has not registered for Selective Service by the time of the naturalization examination must be continued to afford the applicant an opportunity to register. If the applicant refuses to register for Selective Service after being afforded a reasonable opportunity to register, the naturalization application must be denied. The decision denying the application must state specifically that the applicant has refused, after given an opportunity to do so, to register with Selective Service, and that the person, therefore, is not eligible for naturalization because he is not well disposed to the good order and happiness of the United States. The decision must cite § 316(a)(3).
Applicants Between 26 and 31 Years of Age:
A man between 26 and 31 years of age[1] who was required to register for Selective Service and who knowingly and willfully failed to register cannot demonstrate that he is eligible for naturalization. Every male naturalization applicant between 26 and 31 years of age who failed to register for Selective Service must provide evidence that his failure to register was not knowing and willful or that he was not required to register. If a male naturalization applicant between 26 and 31 years of age failed to register with Selective Service, the naturalization examination must be continued to give the applicant an opportunity to obtain evidence that his failure to register was not knowing and willful or that he was not required to register. If the applicant is unable to demonstrate that his failure to register was not knowing and willful or that he was not required to register, his naturalization application must be denied. Again, the decision must state explicitly that the INS has found that his willful failure to register with Selective Service means he cannot show that, during the requisite period before filing his application, he was not well disposed to the good order and happiness of the United States. The decision must cite § 316(a)(3).
Applicants Over 31 Years of Age:
Failure to register for Selective Service will generally not prevent a man who was over 31 years of age on the day he filed his naturalization application from demonstrating that he is eligible for naturalization. Even if the applicant was required to register and the applicant's failure to register was knowing and willful, the failure occurred outside of the statutory period during which the applicant is required to establish his attachment to the good order and happiness of the United States. The INS may, of course, consider a person's conduct before the beginning of this period. INA § 101(f) (last sentence) and § 316(e). If the INS denies naturalization to a man who is at least 31, based on his failure to register with Selective Service, the decision must state explicitly the basis for finding that the failure to register warrants denial of naturalization. As a practical matter, a male applicant over 31 years of age who failed to register with Selective Service should, ordinarily, be found eligible for naturalization unless INS has other evidence, in addition to the past failure to register, that demonstrates that the applicant is not well disposed to the good order and happiness of the United States.
