National Park Service
Mission: preserve unimpaired the natural and cultural resources and values of the national park system for the enjoyment, education, and inspiration of this and future generations.
Environmental Protection Agency
Mission: protects people and the environment from significant health risks, sponsors and conducts research, and develops and enforces environmental regulations.
Bureau of Land Management
Mission: to sustain the health, diversity, and productivity of public lands for the use and enjoyment of present and future generations.