On behalf of the millions of Americans represented by our organizations, we write to strongly oppose H.R. 399, the “Secure Our Borders First Act of 2015,” in particular Section 3, “Operational Control of the Border,” and Section 13, “Prohibition on Actions that Impede Border Security on Certain Federal Land.” Under the guise of enhancing border security, Section 3 would further militarize natural areas and communities already glutted with border walls, roads and towers; Section 13 would undermine fundamental environmental and conservation laws and would allow further damage to the fragile border environment and the people and communities dependent upon it.