Walker, Joseph Albert (1921-1966) American NACA/NASA test pilot 1945-1966. Flew D-558, X-1, X-3, X-4, and X-5, and into space on X-15 Flights 77, 90, and 91. Killed in 1968 when the F-104 he was flying collided with the XB-70 during a photo opportunity.
Born in Washington Pennsylvania; married, four children. Received BA degree in physics in 1942 from Washington and Jefferson College. Joined Army Air Force and flew P-38's in World War II. Joined NACA in March 1945 and served as project pilot on D-558, X-1, X-3, X-4, and X-5 before being assigned chief X-15 pilot for NASA. Obtained both USAF and FAI astronaut wings on record 108 km flight. After X-15 tested LLRV lunar module trainer. Killed when F-104 he was flying in formation with XB-70 number 2 became caught in a vortex, went out of control, colliding with the XB-70 and resulting in the destruction of both aircraft.