NASA has cancelled the Exploration Upper Stage program, ending a decade-long effort that consumed more than $3.5 billion in taxpayer funds without producing a flight-ready rocket, and will instead buy upper stages for SLS Artemis IV and Artemis V from United Launch Alliance.
The decision surfaced not in a press conference but in a procurement notice on a government website, announcing a sole-source contract to ULA for next-generation upper stages. The understated delivery matched the program’s history: vast sums spent with little to show.
Boeing held the original contract, awarded more than a decade ago, with a starting price of $962 million. The plan was to fly the upgraded stage on the second SLS mission in 2021. Neither target survived contact with reality. By the time the program was killed, the upper stage remained years from operational readiness, and the dedicated launch tower at Kennedy Space Center — initially budgeted at $383 million — was tracking toward more than $2 billion.
A Solution in Search of a Problem
The program’s origins trace to 2011, when Congress and NASA designed SLS around an interim upper stage — a modified version of the Delta IV rocket’s upper stage — with a permanent replacement to follow. What followed instead was a politically convenient build-it-ourselves mandate.
Lawmakers allocated $85 million for preliminary development in 2016. The spending spread across Boeing for the stage itself, Aerojet Rocketdyne for the RL-10 engines — a design with six decades of flight history — and the launch tower construction work in Florida. Jobs flowed to Alabama, Mississippi, Texas, and Florida, which goes some distance toward explaining why the program survived as long as it did.
Cheaper alternatives existed throughout. ULA was already developing the Centaur V upper stage for its Vulcan rocket, using the same liquid hydrogen propellant as the SLS core stage. Blue Origin offered a competing proposal built around its BE-3U hydrogen engine. According to the report, the agency declined both, repeatedly, over years.
What the Money Did Not Buy
The Exploration Upper Stage was not part of the Artemis III lunar landing mission. The billions spent on it contributed nothing to that goal. By the program’s end, the hardware was years behind schedule and the costs had ballooned well past original projections at every level.
New NASA Administrator Jared Isaacman, weeks into the role, began examining the agency’s lunar architecture and asking foundational questions about where the money was going and why. The cancellation followed.
The RL-10 engines that were to power the Exploration Upper Stage have been flying since the early 1960s. Building a new stage around them, at a cost exceeding $3.5 billion over ten years, while commercially developed alternatives waited in the wings, was a choice — one that lawmakers, contractors, and multiple agency administrations made together, year after year, until someone finally didn’t.
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