Abstract
U.S. visa applications for people who are studying or working in some sensitive scientific and technical fields are subject to an interagency clearance in Washington, D.C., called Visas Mantis. The U.S. State Department, in consultation with the Department of Homeland Security, announced extensions for the validity of Visas Mantis in the F (international student), J (exchange visitors), H (temporary workers), L (intracompany transferees) and B (tourist and business) categories on 11 February.F visas will be valid for the length of the student's approved academic program, for up to four years. J, H, and L visas will be valid for the duration of the approved activity, with a maximum of two years. If the visa holder's activity changes at any time after issuance, the holder must apply for a new visa.
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