Recent propellant tank rupture during structural qualification testing in January 2026 forced Rocket Lab to shift Neutron’s inaugural flight from an earlier 2026 target to no sooner than the fourth quarter, leaving narrow schedule margin for the remaining ground-test campaign. Traders see this as the dominant driver behind the near-even 52.5 % “No” odds, reflecting uncertainty over successful completion of Archimedes engine hot-fire sequences, full-stage integration, and pad readiness at Launch Complex 3 before year-end. Historical precedent for new medium-lift vehicles shows qualification timelines often slip when anomalies appear, while company statements continue to stress risk retirement over fixed dates. Any successful static-fire milestone or revised test schedule in the coming weeks could narrow the gap; conversely, further anomalies would likely widen the “No” probability.