Under current law, all male U.S. citizens are required to register with Selective Service within 30 days of their 18th birthday. In addition, non-U.S.-citizen males between the ages of 18 and 25 (inclusive) living in the United States must register. This includes permanent residents (holders of Green Cards), refugees, asylees, and illegal immigrants.[2] Foreign males in the United States as lawful non-immigrants (international students, visitors, diplomats, etc.) are not required to register.[2] Failure to register as required is grounds for denying a petition for US citizenship. Currently, citizens who are 17 and 3 months old can pre-register so when they turn 18 their information will automatically be added into the system.