Active-duty troops deployed to the US-Mexico border are increasingly bracing for confrontations rather than just running razor wire to deter their entry in the US, images published by the US military show.

In November 2018, US troops have been conducting non-lethal riot control training at bases in Arizona and California, and tactical training is expected to continue.


Soldiers and Marines were also apparently present on Nov. 25, 2018, at San Ysidro, a busy port of entry where border agents clashed with migrants, using tear gas against those who rushed the border.

Watch US troops engage in tactical training in preparation for violence:​

This is how US troops are training for confrontations at the border.

For weeks, the emphasis was on hardening crossings and ports of entry, but now there appears to be an increased focus on force protection.

Soldiers from 65th Military Police Company, 503rd Airborne Military Police Battalion, finish non lethal training in Davis-Monthan Air Force Base, Arizona, Nov. 26, 2018.

(U.S. Army Photo by Pfc. Bradley McKinley)

Active-duty military personnel with riot shields were present at the San Ysidro port of entry Nov. 25, 2018, when CBP agents used tear gas and tactics to drive back migrants who rushed the border, some of whom threw rocks at US agents. Some critics have called the CBP response an overreaction.

Marines attached to Special Purpose Marine Air-Ground Task Force 7 join Customs and Border Protection at San Ysidro Point of Entry, California, Nov. 25, 2018.

(U.S. Army photo by Staff Sgt. Jesse Untalan)

US troops are authorized to provide force protection for border agents, but are barred by law from law enforcement in the US.

While some training is taking place in California, just opposite where thousands of migrants have set up camp, much of the tactical training appears to be occurring in Arizona.

Soldiers from 65th Military Police Company, 503rd Airborne Military Police Battalion, take cover to conduct non lethal training in Davis-Monthan Air Force Base, Arizona, Nov. 26, 2018.

(U.S. Army Photo by Pfc. Bradley McKinley)

300 active-duty troops previously stationed in Texas and Arizona were shifted to California.

Soldiers from the 65th Military Police Company, 503rd Airborne Military Police Battalion, conduct non-lethal riot control training in Davis-Monthan Air Force Base.

(U.S. Army Photo by Pfc. Bradley McKinley)

This article originally appeared on Business Insider. Follow @BusinessInsider on Twitter.