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USAF Captain Milburn G. Apt becomes the first person to exceed Mach 3. Shortly thereafter, the Bell X-2 goes out of control and Captain Apt is killed.

Historical image related to USAF Captain Milburn G. Apt becomes the first person to exceed Mach 3. Shortly thereafter, the Bell X-2 goes out of control and Captain Apt is killed. from September 27, 1956

Milburn G. Apt

American test pilot (1924–1956)

Milburn Grant "Mel" Apt was a U.S. Air Force test pilot, and the first man to attain speeds faster than Mach 3. He was killed after separating from the Bell X-2 in his escape capsule during the record-setting flight that exceeded Mach 3. Shortly afterwards, Secretary of the Air…
Source: Wikipedia (CC BY-SA)

Bell X-2

Experimental aircraft build to investigate flight characteristics in the Mach 2–3 range

The Bell X-2 was an X-plane research aircraft built to investigate flight characteristics in the Mach 2–3 range. The X-2 was a rocket-powered, swept-wing research aircraft developed jointly in 1945 by Bell Aircraft Corporation, the United States Army Air Forces and the National…
Source: Wikipedia (CC BY-SA)