(a) Application. An applicant for naturalization under under section 328 of the Act must submit an application on the form prescribed by USCIS in accordance with the form instructions and as provided in 8 CFR 316.4.

(b) Evidence. The applicant's eligibility for naturalization under 8 CFR 328.2(a) or (b) will be established only by a certification of honorable service by the executive department under which the applicant served or is serving.