It looks like a March launch is no longer in the cards for Artemis II, NASA's first crewed trip to the moon's vicinity since the final Apollo mission over 50 years ago. While preparations were underway at the Kennedy Space Center for a launch as soon as March 6, the space agency says it ran into an issue with the flow of helium to its SLS rocket's upper stage this weekend and it now has to roll the rocket from the launch pad back to the Vehicle Assembly Building (VAB) to figure out what's wrong and fix it. A media briefing is planned for sometime this week to discuss the problem and what's next.But in a post on X, NASA Administrator Jared Isaacman confirmed the rollback will "take the March launch window out of consideration." NASA noted on its blog that the current effort "potentially preserves the April launch window, pending the outcome of data findings, repair efforts, and how the schedule comes to fruition in the coming days and weeks." It's a four-mile trip back to the VAB that will take hours to carefully transport the massive rocket and the Orion spacecraft. NASA says it's eyeing February 24 for this trek.The issue occurred overnight in the early hours of February 21, when NASA says it observed "interrupted flow of helium to the SLS (Space Launch System) rocket's interim cryogenic propulsion stage." The space agency explained: