Department of the Interior

United States Department of the Interior was a pre-War department of the United States government. The Department of the Interior was a federal executive department responsible for the conservation of most federal lands, natural resources, and other related entities, such as the United States Geological Survey.

Background
The DOI operated the national parks (largely through the National Park Agency) of the United States and was even producing posters for parks like the Zion National Park series produced right before the Great War. They also had an Appalachian division, creating posters for regions in West Virginia. In addition, they also mapped geological areas for vault construction. Following the Great War, the Secretary of the Interior took refuge in the Whitespring bunker alongside Secretary of Agriculture Thomas Eckhart.

Outside of the control of the DOI, the federal government would see fit to revoke the national park status of the Grand Canyon, effectively taking responsibility of the Grand Canyon from the Interior and into the hands of corporations to exploit its natural resources.