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The U.S. military has added layers of concertina wire to six miles of the border fence near San Ysidro.

Meanwhile, the Border Patrol, with the assistance of 750 U.S. military troops, has reinforced six miles of the border wall with concertina wire.

A gate in the barrier opened and Border Patrol, Marines and Army officials showed reporters how both fences were now sheathed in concertina wire.

“What we see behind us here today is the result of a true whole-of-government effort, from the Marines laying down miles of concertina wire along the border infrastructure, to the soldiers manning our scope trucks and remote video surveillance cameras,” he said.

Some desperate enough might even try to jump over all the newly installed concertina wire.