The Air Forces Atlas booster, a modified intercontinental ballistic missile, was used in all four orbital Mercury flights. This May 1963 photo shows Mercury Atlas 9 awaiting launch. (U.S. Air Force photo)
The Air Forces Atlas booster, a modified intercontinental ballistic missile, was used in all four orbital Mercury flights. This May 1963 photo shows Mercury Atlas 9 awaiting launch. (U.S. Air Force photo)