The sole SR-71B for NASA is seen here at the platform of NASA Dryden Flight Research Center at Edwards AFB (CA). Unfortunately, the full back light did not create the very best picture... The trainer was prepared for a familiarisation flight, its first official research flight for Dryden DFRC took place some two years later, on 9 March 1993. NASA 831 is former USAF 64-17956 and was delivered to the NASA on 25 July 1991 after a long USAF service that started in November 1965. After its NASA career the aircraft was dismantled and delivered to the Kalamazoo (MI) Air Zoo in March 2003 for perservation.