Your passport must be valid at least six months into the future. You should contact the closest Embassy or Consulate to renew your passport while in the U.S. Report a lost or stolen passport to the police, as well as your home country government. Some countries require a police report before issuing a new passport. www.state.gov/s/cpr/rls/fco
U.S. consular officials place the visa in your passport indicating your eligibility to enter or re-enter the U.S. It does not determine your length of stay in the U.S. If your expires while you are in the U.S., it is not necessary to renew it as long as you remain in the country. You will need to renew your visa if you leave the country and want to re-enter after your visa is expired. A visa can only be secured at a U.S. Embassy or Consulate overseas.
I-94 Admission Record
Customs and Border Patrol officer will stamp a student’s passport (usually above the visa page) and write “F-1 D/S” or “J-1 D/S.” D/S stands for “duration of status.” Except for brief visits (30 days or less) to Canada, Mexico and some Caribbean islands, a new admission number will be issued each time you enter the U.S.
Students may need to provide their admission number to various offices and agencies of state and federal governments. In order to access your I-94 admission number, please go to this Customs and Border Patrol website and provide the required data.
The Center for Global Engagement is required by the Department of Homeland Security (DHS) to keep a copy of all documents in your student file.