SR-71A 17951, on display at Pima Air Museum in Tucson, AZ, is the matriarch of the SR fleet. She is the oldest surviving SR-71 with only one produced before her, 17950, which was lost to a fire on the runway.

On 25 January 1966, SR-71A (61-7952) was scheduled for a mission to test reconnaissance systems sensor performance and evaluate use of the navigation system as a controller for integrated sensor and aircraft management. The flight crew included Lockheed test pilot William A. Weaver and flight test reconnaissance and navigation systems specialist James T. Zwayer. The mission callsign was DUTCH 54.

On 18 December 1969, SR-71A (61-7953) was scheduled for a functional check flight (FCF), piloted by SR-71/F-12 Test Force director Col. Joe Rogers and his Reconnaissance Systems Operator (RSO), Maj. Gary Heidelbaugh. The mission callsign was DUTCH 68. The aircraft configuration included, for the first time ever, the Optical Bar Camera (OBC) nose assembly.

10 May 1966 First SR-71A #958 delivered to Beale AFB, CA USAF Pilots:Doug Nelson/ Pennington (LSB)(LSW says 4 Apr 1966)

SR-71A S/N 61-7959, also known as "Big Tall", came off the assembly line like any other SR-71 when it was rolled out on 16 Aug 1965. But it was chosen as.....

SR-71A 17960 made her final flight on February 27, 1990, into Castle Air Force Base, California. She roared over the runway at low level for one last high speed pass before touching down for the last time.