Section 1337.9 - Effective date of naturalization(a) An applicant for naturalization shall be deemed a citizen of the United States as of the date on which the applicant takes the prescribed oath of allegiance, administered either by the Service or an Immigration Judge in an administrative ceremony or in a ceremony conducted by an appropriate court under § 1337.8 of 8 CFR chapter I.56 FR 50500, Oct. 7, 1991, as amended at 60 FR 37804, July 24, 1995; 66 FR 32147 , June 13, 2001