This X-15A-2 is the second of three X-15s built.
It was retired to the National Museum of the United States Air
Force in October 1969.
North American
X-15A-2
The X-15 was designed to provide data on material and human factors of high-speed, high-altitude flight. It made the first manned probes into the lower edges of space and was built for speeds of up to 4,000 mph and altitudes of 50 miles. But these goals were exceeded on numerous occasions.