NASA Vehicle Assembly Building (VAB) Element Operations Manager Elizabeth Kline stands inside the VAB’s high bay 4 in front of mockups of the Space Launch System (SLS) booster segments on Nov. 19, 2019. Teams from NASA’s Exploration Ground Systems and SLS practiced booster segment mate, training around the clock from Nov. 18 through Nov. 20. SLS will launch the first woman and next man to the Moon by 2024 through the Artemis program.