Overview
- Joint Task Force–Southern Border troops will patrol the 32-mile Yuma zone, temporarily detain unauthorized individuals, and maintain and upgrade border barriers adjacent to Marine Corps Air Station Yuma.
- The Yuma NDA marks the fourth such designation since April, and together these zones cover about one-third of the U.S.-Mexico border with roughly 8,500 active-duty personnel under U.S. Northern Command.
- Unauthorized crossings into National Defense Areas now carry military trespassing charges in addition to immigration violations.
- These designations operate under a 2025 national emergency declaration backing President Trump’s military buffer strategy and extend service-branch jurisdictions to support DHS and CBP operations.
- Civil-liberties organizations and federal public defenders are challenging the legality of NDAs in court, citing the Posse Comitatus Act’s restrictions on military involvement in civilian law enforcement.