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Mercury-Redstone 4
Mercury-Redstone 4
was the second
United States
human spaceflight
, on July 21, 1961. The
suborbital
Project Mercury
flight was launched with a
Mercury-Redstone Launch Vehicle
, MRLV-8. The spacecraft, Mercury
capsule
#11, was named
Liberty Bell 7
and piloted by
astronaut
Virgil I. "Gus" Grissom
.
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