Fort Lewis was originally established in 1917 with the passage of a Pierce County bond measure to purchase of land to donate to the federal government for permanent use as a military installation. A portion of the initial land was taken from the Nisqually tribe's reservation. (The Nisqually people would later petition unsuccessfully for the return of this land.) In 1927, Pierce County passed another bond measure to establish a military airfield just north of Fort Lewis. The airfield, called Tacoma Field, opened in 1930 and was renamed McChord Field in 1940. McChord Field separated from Fort Lewis when the U.S. Air Force was created in 1947 and was subsequently renamed McChord Air Force Base. The two bases operated independently of one another for more than 60 years before merging in 2010.