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John Glenn talks with Gus Grissom before Grissom's MR-4 flight

Mercury Project

Astronaut Virgil Grissom chats with Astronaut John Glenn prior to entering the Liberty Bell 7 capsule for the MR-4 Mission. The MR-4 mission was the second manned suborbital flight using the Mercury-Redstone booster, which was developed by the Marshall Space Flight Center.

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