NASA’s crawler-transporter 2, carrying NASA’s Artemis II SLS (Space Launch System) rocket with the Orion spacecraft secured to mobile launcher 1, approaches the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida as the sun sets on Wednesday, Feb. 25, 2026, to troubleshoot the flow of helium to the rocket’s upper stage, the interim cryogenic propulsion stage. Seen in the background is also mobile launcher 2, which will be used on future Artemis flights beginning with Artemis IV. Once complete, the SLS rocket will roll back to Launch Complex 39B to prepare to launch four astronauts around the Moon and back for the Artemis II test flight.