The newest military zone in Arizona -- the fourth border zone created by the Trump administration -- will encompass 140 miles of Department of Interior land near the Barry M. Goldwater range

Orange no-entry signs posted by the U.S. military in English and Spanish dot the New Mexico desert, where a border wall cuts past onion fields and parched ranches with tufts of tall grass growing amidst wiry brush and yucca trees.

The fourth national defense area created along the US-Mexico border will be an extension of Marine Corps Air Station Yuma in the Sonora Desert.