Commanding the Gemini II that circled the Earth three times, which astronaut died in a fire while preparing for the first Apollo mission?

After Alan, Gus Grissom became the second American in space on the Liberty Bell 7. During a pre-flight test for Apollo 1, Gus was killed, alongside colleagues Ed White and Roger Chaffee, in the Apollo 1 command module when an electrical fire erupted.

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