The United States Forest Service (USFS) is an agency within the U.S. Department of Agriculture that administers the nation's 154 national forests and 20 national grasslands covering 193 million acres (780,000 km2) of land. The major divisions of the agency are the Chief's Office, National Forest System, State and Private Forestry, Business Operations, as well as Research and Development. The agency manages about 25% of federal lands and is the sole major national land management agency not part of the U.S. Department of the Interior (which manages the National Park Service, the U.S. Fish and Wildlife Service and the Bureau of Land Management). Source: Wikipedia (en)