Joseph A. Walker

Joseph Albert "Joe" Walker ( 20 February 1921 - 8 June 1966 ) was an American military Test Pilot ; in 1963 , he made two X-15 flights past the 100 kilometer Edge Of Space , the only Spaceplane flights past that threshold made until SpaceShipOne in 2004 . These flights qualified him as an Astronaut under both U.S. Air Force and Fédération Aéronautique Internationale rules. Joe Walker was the first person to enter space twice.

Born in Washington, Pennsylvania , Walker earned a degree in physics from Washington And Jefferson College before entering the United States Army Air Forces . He flew the P-38 Lightning in World War II .

After World War II, Walker spent 21 years working as a test pilot. In 1960 , he was the second person to fly the X-15 aircraft after the manufacturer's test pilot Scott Crossfield; Walker would go on to fly the X-15 24 times, including the only two flights of the X-15 to exceed 100 kilometers in altitude, Flight 90 ( 19 July , 1963 ; 106 km) and Flight 91 ( 22 August , 1963 ; 108 km). Walker was one of the pilots selected for the Man In Space Soonest project, which never came to fruition.

One of the first Fellows of the Society Of Experimental Test Pilots , Walker was killed on June 8 , 1966 , in a collision between his F-104 chase plane and an XB-70 . Walker was married and had four children.

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