I haven't, how do I do so?
As proof of U.S. citizenship only certain documents are accepted. These include:U.S. passport ;Certificate of Naturalization N-550/N-570 ;Certificate of Citizenship N-560/N-561 ;Certificate of Report of Birth DS-1350 ;Consular Report of Birth Abroad FS-240 , CRBA
Do I need other documents?
We will also need to see your Employee identification card which must be current, not expired and show your name, identifying information such as date of birth or age and preferably a recent photograph