Construction work is moving forward in Big Bend National Park as part of the Trump administration's efforts to add new security measures along the southern border, despite continued efforts from locals to stop a project they say will change the landscape. LEARN MOREFor Michael Ryan, a former river guide and ranger who lives in Terlingua and grew up around Big Bend National Park, the heavy machinery is a sign of unwanted change. Big Bend National Park has become the center of a regional debate over the border security project. This story was originally reported for broadcast by NBC DFW. AI tools helped convert the story into a digital article, and an NBC DFW journalist edited it again before publication.