Constructed in October 1964, first flight in March 1965. Entered servive with the USAF in 1965 as 61-7951. Loaned to NASA around May 1991 as an YF-12C with false serial 60-6937. Back to the USAF in October 1978 and redsignated SR-71A. Loaned to Pima somewhere between 1978 and 1991.