To amend title 10, United States Code, to authorize the detail of personnel of the Department of Defense to assist the Immigration and Naturalization Service and the United States Customs Service perform border patrol-related activities.

Authorizes the Secretary of Defense, during each fiscal year, to assign up to 12,000 civilian officers and employees of the Department of Defense and members of the armed forces to temporary duty with: (1) the Immigration and Naturalization Service to assist in preventing the entry into the United States of terrorists, drug traffickers, and illegal aliens; and (2) the U.S. Customs Service to assist in the inspection of cargo, vehicles, and aircraft at points of entry into the United States.