Teams with NASA’s Exploration Ground Systems Program transport the upper stage for the agency’s Artemis II SLS (Space Launch System) rocket from the Multi-Payload Processing Facility (MPPF) at NASA’s Kennedy Space Center in Florida to the spaceport’s Vehicle Assembly Building on Wednesday, April 16, 2025. Technicians fueled the SLS upper stage, known as the interim cryogenic propulsion stage, with hydrazine for its reaction control system at the MPPF and will now integrate the four-story propulsion system with SLS rocket elements atop mobile launcher 1.