Selective Service

WHO MUST REGISTER

Almost all male U.S. citizens, and male  immigrants living in the U.S., who are 18 through 25, are required to register with Selective Service. It's important to know that even though he is registered, a man will not automatically be inducted into the military.

NON-CITIZENS

Some non-citizens are required to register. Others are not. Non-citizens who are not required to register with Selective Service include men who are in the U.S. on student or visitor visas, and men who are part of a diplomatic or trade mission and their families. Almost all other male non-citizens are required to register, including undocumented immigrants, legal permanent residents, and refugees. The general rule is that if a male non-citizen takes up residency in the U.S. before his 26th birthday, he must register with Selective Service.

https://www.sss.gov/Registration/Who-Must-Register/Chart

Register | Selective Service System : Selective Service System (sss.gov)

Men who have registered remain eligible for federal student aid, most federal jobs, and federal job training. Male non-citizens living in the U.S. who are 18 through 25 must register to remain eligible for citizenship.

Source: U.S. Government