At the turn of 20th century more than 400 members of the 9th and 10th Divisions of the U.S. Cavalry, African-Americans know as the Buffalo Soldiers, actively patrolled the newly designated National Parks of Yellowstone, Yosemite and Sequoia. These men performed many of the same duties tasked today to the National Park Service. The Buffalo Soldiers were in effect among the world's first park rangers.