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Passport: The expiration date should always be valid at least 6 months into the future (for example, if your passport expires in July, it should be extended in January). To extend your passport, please contact your country's consulate/embassy in the U.S. or come visit the ISP office for the latest contact information.
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Visa: The visa is either a stamp or sticker put in your passport by the U.S. Consulate in your home country. A visa is necessary only to
ENTER the U.S. The date on the visa shows the latest date you can enter the U.S.,
NOT how long you can stay here. If it is expired or if you change your visa status while in the U.S., you must re-apply for a new visa in order to return to the U.S. It is not necessary to extend your visa if you are not planning a trip outside the U.S. Renewal of visa can only be done at a U.S. Consulate/Embassy in your home country or country of primary residence.
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I-94:
As known as the Arrival/Departure Record, is the small white paper stapled to the page next to your visa stamp in your passport. The date written on the lower right hand corner is the date you must leave the United States. D/S (Duration of Status) is the notation on F-1 visa holder's I-94 Card. The D/S notation is written on the I-94 card as well as in the upper right corner of the I-20 Form.
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I-20: The Certificate of Eligibility for Nonimmigrant (F-1) Student Status, often referred to as the I-20 Form, is an non-immigration document authorized by the ICE to be issued to you by International Student Programs when you were first admitted to
Lincoln Memorial University, three pages total. The I-20 should be kept with you at all times and NOT given up when you leave the U.S. as it will be needed to re-enter the U.S. after a trip or temporary absence. All records of school transfers, work permission, etc. will be recorded on the I-20.