Can a Mistake in form N-400 be fix in the interview?

Yes, you will be given opportunity at the time of the naturalization interview to correct any item on the N-400 application. If the officer does not ask the question, you should volunteer that you were in mandatory military service. Due to the limitations of the Lawyers.com Forums, Alan Lee & Arthur Lee, Esqs.’ (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.