Department of the Interior
From The RadioReference Wiki
Base/Repeater Call Signs
200 Misc agencies 300 Misc agencies 400 Bureau of Land Management 500 Bureau of Indian Affairs 600 U.S. Fish and Wildlife Service 700 National Park Service 800 Bureau of Reclamation 900 Bonneville Power Administration, Southwestern Power Administration and Southeastern Power Administration, all formerly of the Department of the Interior and subsequently absorbed by the Department of Energy when it was created in 1977.
Some examples of this in my local area are the KOJ437 callsign for the BLM Carson City District and KMC719 of Yosemite National Park.
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