American test pilot and astronaut (1921-1966) who was killed when his F-104 Starfighter chase plane collided with an XB-70 Valkyrie; Walker had been flying in a tight group formation for a publicity photo, and was knocked out of control by the supersonic bomber's wake. TLS signed “Joe Walker,” one page, 8 x 10.25, NASA letterhead, July 31, 1963. Letter to a gentleman interested in the X-15 program. In part: “I am most pleased to learn of your interest in the X-15 research program…I know you will find it interesting. We at the National Aeronautics and Space Administration’s Flight Research Center strongly encourage your interest in aeronautical and space research programs.” In fine condition, with a couple trivial creases to top left. RRAuction COA.
