Two tail service masts, each about three stories tall, provide cryogenic propellant lines and electrical cable connections to NASA’s Artemis II SLS (Space Launch System) core stage rocket at Launch Complex 39B at NASA’s Kennedy Space Center in Florida on Tuesday, Feb. 10, 2026. The Artemis II test flight will take Commander Reid Wiseman, Pilot Victor Glover, and Mission Specialist Christina Koch from NASA, and Mission Specialist Jeremy Hansen from the CSA (Canadian Space Agency), around the Moon and back to Earth.