To amend title 10, United States Code, to authorize the Secretary of Defense to assign members of the Armed Forces, under certain circumstances and subject to certain conditions, to assist the Immigration and Naturalization Service and the United States Customs Service in the performance of border protection functions.

Authorizes the Secretary of Defense to assign members of the armed forces to assist: (1) the Immigration and Naturalization Service (INS) in preventing the entry of terrorists, drug traffickers, and illegal aliens into the United States; and (2) the U.S. Customs Service (Customs) in the inspection of cargo, vehicles, and aircraft at U.S. points of entry. Allows such assignment only at the request of the Attorney General (for the INS) or Secretary of the Treasury (for Customs). Requires the Attorney General or the Secretary of the Treasury, together with the Secretary of Defense, to establish a training program for members so assigned. Requires a civilian law enforcement official to accompany each member performing such a function.

Requires notification to the appropriate State of military personnel so assigned.

Terminates the assignment authority after September 30, 2001.