Active-duty troops began arriving at the U.S. Mexico border in Arizona last week to support the needs of Customs and Border Protection as part of the Department of Homeland Security's Operation Secure Line. More than 1,500 troops in total were expected to deploy to Arizona. Their duties so far include installing concertina wire on portions of the fence in Nogales. Military officials have said their mission isn't to stop the approaching caravan of migrants from Central America, but to support CBP.
“Given recent events in Mexico, there is a concern that large groups will attempt to rush the port of entry, put officers at risk, damage infrastructure, and disrupt trade and travel," CBP Director of Field Operations Petra Horne said during a recent news conference.