U.S. embassies and consulates abroad assist the Selective Service System with its registration program abroad. The law requires virtually all male U.S. citizens (regardless of where they live), and male immigrants residing in the U.S. (permanent resident aliens), to register within 30 days of their 18th birthday. Overseas registrants are encouraged to register with the Selective Service website On-Line Registration. Where on-line registration is not available, the nearest U.S. embassy or consulate can be of assistance. Current brochures and guidance are also available on the Selective Service website.