The Artemis Cadence Math
What One Landing Per Year — Then Every Six Months — Actually Requires From the Manufacturing Base
What This Means
NASA’s Ignition announcement committed to at least one crewed lunar landing per year after Artemis IV, scaling to every six months. That cadence goal has not been translated into production contracts. The SLS core stage cycle at Michoud runs 12 to 18 months; the RS-25E engine contract covers only six post-Artemis IV missions; and SpaceX’s Starship tanker manifest has no formal NASA priority framework. Semi-annual cadence requires a 2 to 3 times throughput increase at Michoud, eight or more RS-25E engines per year from L3Harris, and a dedicated tanker fleet reserve — none of which has been ordered. Supply-chain leaders and C-suite executives pricing capacity commitments against the semi-annual target should verify whether the underlying contract modifications exist before treating NASA’s policy language as a demand signal.
NASA’s Ignition announcement on March 24 set a cadence target that no press release bothered to translate into production numbers. Administrator Jared Isaacman made the commitment explicit from the stage: “Today, we are providing a demand signal for frequent crewed missions well beyond Artemis five. We intend to work with no fewer than two launch providers, with the aim of crewed landings every six months, with additional opportunities for new entrants in the years ahead.”
Those are policy words. The manufacturing base operates on different language: core stages per year, engines per flight, tanker launches per mission window. When you convert the policy language into production math, the picture that emerges is useful, specific, and considerably more complicated than the announcement suggested.
Two numbers sit at the center of that math. The first is the Space Launch System (SLS) core stage production rate at Michoud Assembly Facility in New Orleans. The second is SpaceX’s Raptor engine monthly output. Neither number has been officially published. Both are derivable from program documentation and contract records. And when you run them against the stated 2028 to 2030 timeline, they tell supply-chain leaders and executives something the press conference did not: the industrial base is currently resourced for annual cadence at best, and semi-annual cadence would require a manufacturing mobilization that has not yet been ordered.
That gap between commitment and capacity is the most actionable intelligence to come out of Ignition for anyone pricing a long-term contract or making a capital expenditure decision in 2026.
