Non-immigrant foreign nationals can enter the United States as full-time students at recognized academic institutions with the F1 visa. This visa is on777 cash slotsly intended for people who want to enroll in academic programs and/or language training courses in the United States. s. The duration of the student's academic program, including any optional practical training (OPT) that might be offered after studies are finished, is normally covered by the F1 visa.