The Tachikawa Air Force Base (AFB) was a US airfield in western Tokyo. The US military and the Japanese government planned to use this airfield for transporting nuclear weapons. In order to accommodate for the larger aircraft needed to transport these weapons, the Tachikawa AFB needed to expand and lengthen the runway for longer landing and takeoff distances. However, that meant that the government would need to use the surrounding farmland for the expansion. The US military announced the plans for expansion in 1955.