181123-M-TC631-775 OTAY MESA, Calif. (Nov. 23, 2018) A Marine with 7th Engineer Support Battalion, Special Purpose Marine Air-Ground Task Force 7, secures concertina wire on the U.S. and Mexico border at the Otay Mesa Port of Entry in California, Nov. 23, 2018. 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. (U.S. Marine Corps photo by Sgt. Asia J. Sorenson/Released)