it was created as the flying unit of the wright air development center, which was created in june 1951. wright adc changed to division status in december 1959 until it was replaced by the aeronautical systems division (asd) in april 1961. the 4951st, 4952d and 4953d test squadrons were activated in july 1975 and based at the west ramp (a former strategic air command facility) of wright-patterson air force base, ohio.