Army engineers from the 541st Sapper Company install concertina wire along the Donna-Rio Bravo International Bridge at the U.S. Customs and Border Protection port of entry near Donna, Texas. U.S Northern Command is providing military support to the Department of Homeland Security and U.S. Customs and Border Protection to secure the southern border of the United States. (Air Force Video by Tech. Sgt. Nick Kibbey) (NO AUDIO)