Concrete aircraft hangars were used as storage sheds to protect the dwindling number of Japanese Army aircraft during air raids in the Pacific War. They served to preserve aircraft for the seemingly impending decisive battle on the Japanese mainland. As the fighting worsened, approximately 30 concrete hangars and 30 open clay hangars were built over a short period around 1944. The construction of these hangars was mainly undertaken by the Army Air Force and a construction company. A local gardening group and large numbers of junior high students were also mobilized in the effort. Taxiways to the concrete hangars were built and airplanes were guided inside by ropes pulled by people. In Musashinonomori Park and Fuchu City, both located near Chofu airport, two concrete aircraft hangars can still be seen. The concrete hangar at Musashinonomori Park has been preserved as a historic object in memory of the Pacific War.