In late summer 1938 work began on two massive hangars. By the following year the headquarters building, hospital, warehouses, barracks, officers' quarters, test cells, a fire station, and a 300,000 gallon water tower were all finished. The total expenditure amounted to $13.8 million with most of it being funded by President Roosevelt's Works Progress Administration (WPA). Two additional hangars, theaters, numerous barracks and family housing units, a gymnasium, and a network of concrete runways were also added. These projects were completed in 1941, just months before Pearl Harbor.