The Department of Homeland Security (DHS) proposes to amend F-1 nonimmigrant student visa regulations on optional practical training (OPT) for certain students with degrees in science, technology, engineering, or mathematics (STEM) from U.S. institutions of higher education. Specifically, the proposal would allow such F-1 STEM students who have elected to pursue 12 months of OPT in the United States to extend the OPT period by 24 months (STEM OPT extension). This 24-month extension would effectively replace the 17-month STEM OPT extension currently available to certain STEM students.