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        Astronaut Virgil I. Grissom | NASA Missions and Milestones in Space Flight

        Astronaut Virgil I. Grissom climbs into 'Liberty Bell 7' spacecraft the morning of July 21, 1961. Backup Astronaut John Glenn assists in the operation. The Mercury-Redstone 4(MR-4) successfully launched the Liberty Bell 7 at 7:20 am EST on July 21, 1961.

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