The NASA Hyper III aircraft was built in 1969 as part of the lifting body program. The design increased the aerodynamic capabilities of the aircraft when traveling at speed and the absence of wings meant less heat damage during space re-entry. The Hyper III was underpowered and unmanned. When it was launched from the air it simply glided down under remote control and landed safely. It was not developed any further.
#22 Is this one the only one still under testing?