Which Of The Mercury Seven Astronauts Was Grounded In 1962 Before He Could Fly In The Mercury Program Due To A Heart Condition? He Was Finally Cleared To Fly In 1962 And Successfully Flew On The Apollo-Soyuz Mission In 1975.

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1. Which Of The Mercury Seven Astronauts Was Grounded In 1962 Before He Could Fly In The Mercury Program Due To A Heart Condition? He Was Finally Cleared To Fly In 1962 And Successfully Flew On The Apollo-Soyuz Mission In 1975.