 The team was previously known as the unaffiliated Boise Pilots from 1939 to 1951 (except for three years during World War II when the league did not operate), while the Yankees' affiliates in the Pioneer League were previously the Twin Falls Cowboys (1946–51) and the Idaho Falls Russets (1940–41).The Yankees pulled out of the Pioneer League and the western U.S. after the 1953 season.The Boise team's name reverted to Pilots for 1954, then was the Boise Braves (affiliated with the Milwaukee Braves) from 1955 to 1963.