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An engineer with contractor Jacobs prepares for a modal tap test on the Space Launch System (SLS) rocket for Artemis I in a room under the zero deck of the mobile launcher inside the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida on Aug. 16, 2021. The Exploration Ground systems and Jacobs team, along with the SLS team from NASA's Marshall Space Flight Center in Huntsville, Alabama, are performing the tests with support from personnel at other NASA centers. Engineers are using the mass simulator for Orion and the Orion stage adapter structural test article for the modal test. The tests will determine the different modes of vibration with the recently stacked and integrated SLS rocket before launch of the Artemis I mission. Artemis I will be an uncrewed test of the Orion spacecraft and SLS rocket as an integrated system ahead of crewed flights to the Moon. Under Artemis, NASA aims to land the first woman and first person of color on the Moon and establish sustainable lunar exploration.