Code of Federal Regulations Title 32. National Defense § 32.1615.4 Duty of persons required to register

(a) To complete the registration process by a method prescribed by the Director of Selective Service and to record thereon his name, date of birth, sex, Social Security Account Number (SSAN), current mailing address, permanent residence, telephone number, date signed, and signature, if requested;  and

(b) To submit for inspection, upon request, evidence of his identity to a person authorized to accept the registration information. Evidence of identity may be a birth certificate, motor vehicle operator's license, student's identification card, United States Passport, or a similar document.