<P> U.S. Citizenship and Immigration Services has indicated that the U.S. Passport Card may be used in the Employment Eligibility Verification Form I - 9 (form) process . The passport card is considered a "List A" document that may be presented by newly hired employees during the employment eligibility verification process to show work authorized status . "List A" documents are those used by employees to prove both identity and work authorization when completing the Form I - 9 . </P> <P> Members of the Military and employees of the Department of Defense receive identity documents based on their status . A Geneva Conventions Identification Card (called a Common Access Card or CAC) is issued to Active Duty and Selected Reserve service members, DOD employees, and some contractors . Adult dependents of service members, retired service members, and members of the Inactive ready reserve receive a different kind of military ID that does not contain the smart card cryptographic chip that the Common Access Card has . </P> <P> A DOD identification card number usually matches the holder's Social Security Number . But, on June 1, 2011, the DOD began phasing out use of the SSN to protect service members' identities. (1) It was replaced with a 10 - digit DOD ID Number and a 12 - digit Benefits ID Number . </P> <P> In the absence of a national identity card, the typical adult in the United States often possesses a large number of documents issued by many different public and private entities to prove their identity . </P>

2 forms of id for social security card