EDIT: Thank you for your reply. I actually found my naturalization certificate.
I am looking through SF86 form for potential job I will be interviewing for (which requires Secret Clearance). In the citizenship question, I am a naturalized citizen but I cannot find my original certificate (I obtained it about 15 years ago). Therefore, I don’t have my naturalization certificate number with me. I do have my US passport though. I will submit to replace my naturalization certificate by submitting N-565 but I saw somewhere that it may take 6-8 months.
Is it possible to submit the replacement request and mention that in the SF86 application?
Also, I gave up my alien green card when I got naturalized. So I don’t have the alien number either for the Section 9.2 Q: Do/did you have a U.S. alien registration number? If so, provide the number:
I have been using the US passport for years to prove my citizenship.
Thank you so much