A letter report issued by the Government Accountability Office with an abstract that begins "To document the interactions of aliens with the Department of Homeland Security's (DHS) United States Citizenship and Immigration Services (USCIS) and other government entities, USCIS creates alien files, or A-files. While deemed critical, especially in making citizenship decisions, A-files are sometimes missing during adjudications. In 2002, naturalization was granted to an alien whose A-file was missing and who was later found to be associated with a terrorist organization. GAO focused its review on (1) how often USCIS adjudicates naturalization applications without an A-file and why, (2) the effect that missing A-files can have on the adjudication process, and (3) steps taken to help mitigate the risk of missing A-files. To address these questions, GAO interviewed officials and staff from USCIS and reviewed relevant data, policies, and procedures related to processing naturalization applications and the automated file-tracking system DHS established to track the movement of A-files."