A task force of 500 U.S. Marines and sailors is working to construct new fortifications at Arizona’s southern border with Mexico, including adding barbed and concertina wire.

The new task force, called Task Force Forge, comprises personnel assigned to Combat Logistics Battalion 15, 1st Marine Logistics Group, I Marine Expeditionary Force.

The task force is currently at work within U.S. Border Patrol’s Yuma Sector in Arizona. This sector is monitored by Border Patrol agents tasked with securing 126 miles of the border from Arizona to California.

The force assumed its mission last month, taking over the efforts of the outgoing 1st Combat Engineer Battalion, 1st Marine Division, known as Task Force Sapper.

Sapper laid the ground work for barrier reinforcement, which is now being built u

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