Visa
The U.S. visa is the stamp on a page of your passport, which permits students to enter the U.S. The U.S. visa may expire while students are in the U.S.; students cannot and need not renew it while on Duration of Status (D/S) in the United States. A new visa will be required if the original one expires and students travel outside and then reenter the U.S. Students must present the I-20 from their school in order to obtain an F-1 visa. A valid visa may not be necessary for reentry from Canada, Mexico, or adjacent islands other than Cuba, if they will be staying less than thirty days.