Stock Photo - As crew members secure the X_15 rocket_powered aircraft after a research flight, the B_52 mothership used for launching this unique aircraft does a low fly_by overhead. The X_15s made a total of 199 flights over a period of nearly 10 years from 1959 to 1968, and set unofficial world speed and altitude records of 4,520 mph Mach 6.7 and 354,200 feet. Information gained from the highly successful X_15 program contributed to the development of the Mercury, Gemini, and Apollo piloted spaceflight programs, and also the Space Shuttle program.

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