Max Faget’s position was that considering the difficulty of the job,  if each mission was successful half the time, it would be well worth the effort.  But Gilruth thought that was too low.  He want a 90% mission success ratio and a 99% ratio for Astronaut safety.  Walt Williams who was currently running the Mercury program believed that astronaut safety needed to be limited to only 1 failure in a million which was 99.9999%.

Space Rocket History #114 – Apollo: Command Module Design and Development 1963-1964 Part 2

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Just before the mission began things started to go wrong. The weekend before launch Charlie Duke, the backup lunar module pilot, came down with a case of German measles.
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Space Rocket History #259 – Apollo 13 – Introduction – Part 2

Targeted for touchdown on the third lunar landing was a place known as the Fra Mauro range, a stretch of rugged, Appalachian-type mounds 110 miles east of the Apollo 12 landing site.
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Space Rocket History #258 – Apollo 13 – Introduction – Part 1

Ten days ago, their Saturn V rocket had blasted Bean and his crew mates out of earth’s gravitational pull. Now their home planet was pulling them back at more than 24,000 miles per hour, twelve times faster than a high-speed rifle bullet. “Boy,” said Bean, “we are really hauling!”
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Space Rocket History #257 – Apollo 12 – Return, Re-entry and Splashdown

Dick Gordon opened the tunnel to Intrepid, saw his companions floating in a dirty cloud of moon dust, and slammed the hatch closed. He called out, “You guys ain’t gonna mess up my nice clean spacecraft!”
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Space Rocket History #256 – Apollo 12 – Leaving the Moon

After a total of 31.6 hours on the moon, the Lunar Module ascent stage fired for about 7 minutes placing Intrepid into an orbit of 10 miles by 54 miles.
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Space Rocket History #114 – Apollo: Command Module Design and Development 1963-1964 Part 2

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