Mail your completed application and all required materials to: You must also submit a photocopy of your DD Form 214, Certificate of Release or Discharge from Active Duty, NGB Form 22, National Guard Report of Separation and Record of Service, or other official discharge document for all periods of service. armed forces, you still must submit a completed Form N-426, but the Form N-426 may be uncertified. If you have already separated from the U.S. Ask your chain of command to certify your honorable military service on Form N-426, Request for Certification of Military or Naval Service. These liaisons are typically assigned to a specific office (for example, your installation’s community service center, DOS family liaison office or Judge Advocate General). Many military installations have a designated USCIS liaison to help you with the naturalization application process.