Joe Walker reached 354,200 feet in X-15 #3, the highest altitude reached by the X-15.
Joe Walker reached 354,200 feet in X-15 #3, the highest altitude reached by the X-15. Walker was the first man to visit space more than once, flying there three times. He left the X-15 program after this flight, and was assigned to the Lunar Landing Research Vehicle (LLRV) program.NASA Photo
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