According to the text, the Bureau of Land Management (BLM) is responsible for managing livestock grazing on 155 million acres of public lands in the United States. This covers 21,000 allotments in 13 states, which is equivalent to the size of California. The BLM issues nearly 18,000 grazing permits, while the Forest Service (FS) manages grazing on 102 acres of public land. Despite concerns about land-health standards, ranchers hold approximately 18,000 permits and leases for grazing on BLM-managed lands. Overall, 25% of the nation's public lands are used for livestock grazing, with 40% being actively grazed.