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The launch umbilical tower (LUT) used during the Apollo program was a structure that sat next to the unlaunched rocket. The structure provided access to the rocket. The LUT remained connected to the rocket all the way up until launch, with some components even staying attached for a few seconds after launch.
- "The Swing-Arm Controversy". Moonport: A History of Apollo Launch Facilities and Operations. NASA. Retrieved 2019-08-21.