U.S. Army Sgt. Javier Torres, a military policeman

U.S. Army Sgt. Javier Torres, a military policeman with 93rd Military Police Battalion, Special Purpose Marine Air-Ground Task Force 7, clears his gas mask during port of entry readiness training with U.S. Customs and Border Protection (CBP) officers at the Otay Mesa Port of Entry in California, Dec. 3, 2018. Department of Defense military personnel were authorized to provide force protection for CBP personnel to help ensure they can perform their assigned federal functions. U.S. Northern Command is providing military support to the Department of Homeland Security and CBP to secure the southern border of the United States. (U.S. Marine Corps photo by Lance Cpl. Brendan Mullin)