NASA's Artemis moon mission, set to launch on April 1, is facing a series of technical issues, including life-support-system issues and a persistent hydrogen leak. The mission is designed to replicate the Apollo 8 circumlunar mission almost 60 years ago, and is seen as a precursor to a manned landing on the moon. Critics have criticized the Artemis rocket, the Space Launch System, for deliberately preserving existing jobs for existing contractors in important states. The Apollo missions of the late 1960s and early '70s were risky, but the Apollo program's cutting-edge technology advanced the state of the art in astronautics. The Artemis craft uses off-the-shelf technology developed for the Space Shuttle, including the shuttle’s main engines and fuel tanks. However, the mission's success probability is "a little better than a coin toss", according to mission manager John Honeycutt.