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Ellison Onizuka

Ellison Shoji Onizuka (June 24, 1946 - January 28 - 1986) was an American astronaut who died during the explosion of the Space Shuttle Challenger, where he was serving as mission specialist.

Onizuka received a Bachelor's degree in aerospace engineering in June 1969, and a Master's in that field in December of the same year, from the University of Colorado. He then entered active duty with the United States Air Force, where he served as a flight test engineer and as a test pilot.

He had been selected for the astronaut program in January 1978, and had flown a previous mission on the Space Shuttle Discovery in January, 1985, also serving as a mission specialist. He held the rank of Lieutenant Colonel at the time of his death.

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