"US citizens or immigrants who are born male and changed their gender to female are still required to register. Individuals who are born female and changed their gender to male are not required to register."
"U.S. immigrants are required by law to register with the Selective Service System 30 days after their 18th birthday or 30 days after entry into the United States if they are between the ages of 18 and 25. This includes U.S. born and naturalized citizens, parolees, undocumented immigrants, legal permanent residents, asylum seekers, refugees, and all males with visas of any kind which expired more than 30 days ago."
Per: https://www.sss.gov/register/who-needs-to-register/#p1
"US citizens or immigrants who are born male and changed their gender to female are still required to register. Individuals who are born female and changed their gender to male are not required to register."
"U.S. immigrants are required by law to register with the Selective Service System 30 days after their 18th birthday or 30 days after entry into the United States if they are between the ages of 18 and 25. This includes U.S. born and naturalized citizens, parolees, undocumented immigrants, legal permanent residents, asylum seekers, refugees, and all males with visas of any kind which expired more than 30 days ago."