Exchange visitors in the categories above may be subject to the Two-Year Home Country Physical Presence Requirement.
J-1 Exchange Visitors are not allowed to change to a different J-1 category within the U.S.; a change of J-1 category is possible by departing the U.S. and re-entering in a new category.
Source:https://ic.uci.edu/scholars/j-1/J-1-scholar-categories.php
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