Lockheed A-12, 60-6924 is the prototype A-12
Lockheed SR-71A, 61-7973
And the cool part is they are parked like this at the Airpark at Plant 42 in Palmdale CA
Lockheed YF-117A 79-10783,
Lockheed U-2D, 56-6721 was built with a second seat in place of the instrument bay behind the cockpit.
Mach 3+ D-21 drones were designed to be launched from the Lockheed M-21. After the loss of an M-21 during the launch of a D-21, the D-21s were launched from Boeing B-52H Stratofortresses using solid fuel rocket boosters.