The base's origins begin with the establishment of Wilbur Wright Field on 22 May and McCook Field in November 1917, both established by the Aviation Section, U.S. Signal Corps as World War I installations. McCook was used as a testing field and for aviation experiments. Wright was used as a flying field (renamed Patterson Field in 1931); Fairfield Aviation General Supply Depot; armorers' school, and a temporary storage depot. McCook's functions were transferred to Wright Field when it was closed in October 1927. Wright-Patterson AFB was established in 1948 as a merger of Patterson and Wright Fields.