Harrison Schmitt played a key role in training Apollo crews to be geologic observers when they were in lunar orbit and competent geologic field workers when they were on the lunar surface. After each of the landing missions, he participated in the examination and evaluation of the returned lunar samples and helped the crews with the scientific aspects of their mission reports.
Apollo 17 would break several crewed spaceflight records: 1) longest moon mission duration: 12 days 13 hours 52 minutes (just a day and a third shorter than the 14 days set in 1965 by Gemini 7), 2) longest total lunar surface extravehicular activities (22 hours 4 minutes), 3) largest lunar sample return (110.52 kilograms or 243.7 pounds), – longest time in lunar orbit (6 days 4 hours), and 4) most lunar orbits (75).
On November 9, 1970, the Apollo 14/Saturn V assembly, as tall as a 36-story building, rolled out of the Vehicle Assembly Building on the proportionally huge crawler transporter.
The successful Apollo 7 flight cleared the way for a US moon landing in 1969. Still a lot of flight and ground testing remained and there would probably be surprises. The greatest concern was Nasa had to complete three virtually flawless missions and achieve every major test objective before a lunar landing could be attempted. The odds seemed to be stack against NASA.