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A pair of crawler-transporters (nicknamed “Hans” and “Franz”) were built in 1965 to move the massive Saturn V rocket from Kennedy’s VAB to Launch Complex 39. After the Moon landing and Skylab programs ended, the crawlers were used to transport the space shuttles.

CT-2 was upgraded for the Artemis program around 2012.
CT-1 was originally planned for commercial launch vehicles but its future remains uncertain.

https://en.wikipedia.org/wiki/Crawler-transporter
https://www.nasa.gov/humans-in-space/exploration-ground-systems/the-crawlers/
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