The highly modified Schweizer 1-36 NASA used for deep stall research is now at the National Soaring Museum. It's in poor condition and therefore not currently on display. We have photos and videos of it in flight, piloted by Einar Enevoldson.

I saw it in the NASA hangar at Edwards around 1990 or 91. Seemed to be in OK shape at the time. The cockpit looked like it had a bunch of electronics mounted where the seat had been. That's what made me think that it had been flown as a drone.