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A supply tower (sometimes erroneously called a launch tower) is constructed on the launch pad of a rocket to facilitate fueling and loading cargo into the craft. A supply tower also usually includes an elevator which allows maintenance to be performed and, in the case of a manned rocket, the crew to board. Immediately before ignition of the rocket's motors all connections between the tower and the craft are severed and the bridges over which these connections pass often swing away to prevent damage. In contrast with launch towers, supply towers do not guide rockets as they lift off.
