(NewsNation) — An Arizona community has become the fourth stretch of land along the U.S.-Mexico border that is deemed a National Defense Area since April, designating it as an area where American military troops can charge migrants with federal crimes.

Troops are now stationed in Yuma after the Department of Defense added a stretch of 32 miles along the border to be added to the more than 500 miles that are being patrolled by military personnel. The Yuma Defense Area is an extension of the Marine Corps training base that is already in place near the Barry Goldwater Training Range.

Military troops are already in place in the latest zone and have been assigned to detain migrants who enter the United States illegally and will also be assisting with upgrading the existing border barriers.

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