If you’re a non-citizen who has ever applied for an immigration benefit, including U.S. entry at the border or an airport, the Department of Homeland Security (DHS) has an “A file” (alien file) on you. Why not see what’s in it? DHS’s new mobile app is an attempt to make it easier to do so. There are many reasons why a non-citizen might want to see the file. Here is at least one reason why you should: Every time you apply for a new or renewal immigration benefit, DHS will review your “A file.” If you haven’t kept records of your immigration history, the “A file” is a practical way to resurrect it. It is always a good idea to have at least as much documentation about yourself as the government does.