Indicate on your N-400 application that you did not file for the selective service and attach a short paragraph explaining that you were not aware of the filing requirement and that your failure to register was not knowing or willful. I always recommend to my clients that they also go to the Selective Service website (www.sss.gov) to request a Status Information Letter. This letter will indicate whether or not Selective Service advised you of the requirement when you were between the ages of...