What is The Selective Service System?
The Selective Service System is an independent agency within the Executive Branch of the Federal Government. The Director of Selective Service is appointed by the President and confirmed by the Senate. Selective Service is not a part of the Department of Defense.
The Federal law under which the agency operates is the Military Selective Service Act. Under this law, the mission of the Selective Service System is to provide the numbers of men needed by the Armed Forces, within the time required, should Congress and the President decide to return to a draft, in the event of a national emergency. Selective Service would also be responsible for administering a program of alternative service for conscientious objectors.

Enrollment allows you to record information about your upcoming trip abroad that the Department of State can use to assist you in case of an emergency.