8 C.F.R. § 327.1 Eligibility.
To be eligible for naturalization under section 327 of the Act, an applicant must establish that:
(a) The applicant, on or after September 1, 1939 and on or before September 2, 1945:
(1) Served in the military, air or naval forces of any country at war with a country with which the United States was at war after December 7, 1941 and before September 2, 1945; or
(2) Took an oath of allegiance or obligation for purposes of entering or serving in the military, air, or, naval forces of any country at war with a country with which the United States was at war after December 7, 1941 and before September 2, 1945;
(b) The applicant was a United States citizen at the time of the service or oath specified in paragraph (a) of this section;
(c) The applicant lost United States citizenship as a result of the service or oath specified in paragraph (a) of this section;
(d) The applicant has been lawfully admitted for permanent residence and intends to reside permanently in the United States;
(e) The applicant is, and has been for a period of at least five years immediately preceding taking the oath required in § 327.2(c), a person of good moral character, attached to the principles of the Constitution of the United States, and favorably disposed toward the good order and happiness of the United States; and
(f) The applicant has complied with all other requirements for naturalization as provided in part 316 of this chapter, except for those contained in § 316.2 (a)(3) through (a)(6) of this chapter.