Jun 20 1951

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First launching of USAF B-61 Martin Matador pilotless aircraft at Missile Test Center. Bell X-5 (No. 1) research airplane made first flight of 30 minutes at Edwards, Calif., with Jean Ziegler as pilot. This was first flight of an aircraft with variable-sweep, a USAF-NACA research project for investigation of various sweeps.

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