To provide for the deployment of additional National Guard troops along the international border between the United States and Mexico in support of the border control activities of the United States Customs and Border Protection of the Department of Homeland Security.

Directs the Secretary of Defense (DOD) to: (1) increase the number of National Guard personnel deployed along the U.S.-Mexico border in support of border control activities by at least 3,000 above the number so deployed as of May 1, 2010; and (2) maintain the increased number through 2011. Permits specified decreases in the number of National Guard personnel so deployed if the number of Border Patrol agents serving along such border is more than 20,163.

Excludes National Guard personnel so deployed from National Guard end strength limits or active-duty operational support limits.