Robert A. Rushworth
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Robert Rushworth was a USAF test pilot who flew the X-15 thirty-four times to a maximum speed of 4,018 mph (Mach 6.06) and a maximum altitude of 285,000 feet.

He not only flew the rocket research aircraft more times than any other pilot but was also the second Air Force X-15 pilot to attain the astronaut rating. Having served in World War II, Korea, and Vietnam, Rushworth also served in a number of important positions including that of Commander, AF Test and Evaluation Center.

He retired from the Air Force in 1981 as Vice Commander of the Aeronautical Systems Division at Wright-Patterson AFB, Ohio.