The M-1 visa is a type of student visa reserved for vocational and technical schools. Students in M-1 status may not work on or off campus while studying, and they may not change their status to F-1. The M-2 visa permits the spouse and minor children of an M-1 vocational student to accompany him or her to the United States. O visa The O visa is a classification of non-immigrant temporary worker visa granted to an alien "who possesses extraordinary ability in the sciences, arts, education, business, or athletics (O-1A visa), or who has a demonstrated record of extraordinary achievement in the motion picture or television industry and has been recognized nationally or internationally for those achievements," (O-1B visa) and to certain assistants (O-2 visa) and immediate family members of such aliens (O-3 visa). P visa P visas are issued to individuals or team athletes, or member of an entertainment group including persons providing essential support services (P-1 visa), artists or entertainers (individual or group) under a reciprocal exchange program (P-2 visa) and artists or entertainers (individual or group) visiting to perform, teach or coach under a program that is culturally unique (P-3 Visa). P-4 visas are issued to spouses, or children under the age of 21, of a P-1, P-2, or P-3 alien and who is accompanying, or following to join. Q visa The Q visa is issued to participants in an international cultural exchange program. R visa The R-1 visa is issued to temporary religious workers. They must have been a member of a religious denomination having a bona fide non-profit religious organization in the United States for at least 2 years. R-2 visa is issued to dependent family members. S visa S visas are nonimmigrant visas issued to individuals who have assisted law enforcement as a witness or informant. There is a limit of 200 S visas a year. A law enforcement agency can then submit an application for resident alien status, i.e. a green card on behalf of the witness or informant once the individual has completed the terms and conditions of his or her S visa. TN visa NAFTA Professional (TN) visa allows citizens of Canada and Mexico whose profession is on the NAFTA list and who must hold a bachelor's degree to work in the United States on a prearranged job. Canadian citizens usually do not need a visa to work under the TN