The hardest part of returning astronauts to the Moon is not the rocket or the capsule - it is the lander, and in March 2026 NASA's Office of Inspector General delivered the most consequential public assessment yet of whether the landers will be ready: IG-26-004, NASA's Management of the Human Landing System Contracts, reproduced here in full facsimile.

The fifty-page audit examines both contracted landers - SpaceX's Starship HLS and Blue Origin's Blue Moon Mark 2 - and the contracts behind them. On Starship, it documents the dependency chain that dominates Artemis III risk: the orbital refueling campaign requiring multiple tanker flights whose cadence remains undemonstrated, cryogenic propellant transfer at unprecedented scale, and an integrated lunar demonstration whose schedule has absorbed years of slip. On Blue Moon, it assesses a program younger but structurally similar in its appetite for new technology. On contracts, the OIG scrutinizes the milestone-payment architecture, NASA's insight into contractor progress, and the painful question of what leverage a fixed-price agreement actually provides when the schedule is the thing slipping. The bottom line - material risk that the landing slides toward the end of the decade - is delivered with audit-grade evidence rather than launch-day optimism.

Paired with IG-24-011 on Artemis II readiness, also in this series, this report completes the OIG's public picture of the lunar campaign's two hinges: the crewed flight around the Moon, and the descent to it.

The official source document is reproduced in full facsimile, with separate editorial apparatus of the public document, produced under 17 U.S.C. §105. For space industry analysts, lunar program watchers, acquisition professionals studying fixed-price megaprojects, and readers who want the audited truth beneath the animations, IG-26-004 is the document to own.

Beyond its program findings, IG-26-004 is a landmark in the public accounting of fixed-price spaceflight: the most detailed examination yet published of what happens when the government buys a service it cannot specify, from providers whose own ambitions exceed the contract, on schedules that physics rather than milestones will decide. Its analysis of NASA's limited insight into contractor progress -- and of what the milestone structure does and does not incentivize -- will be cited in every future debate over commercial acquisition models, from space stations to lunar logistics. Readers following the Artemis campaign through this series hold, with this volume and the Artemis II readiness audit, the two most consequential independent assessments of whether America's lunar return arrives this decade.

About this series: Nimble Ultra's American Spacepower Documents collection puts the primary sources of the space age's second great competition into durable, uniform print -- doctrine, strategy, intelligence, oversight, and exploration architecture, each volume an exact and complete facsimile of the official public release, with full bibliographic identification for citation. Government URLs break, documents are revised without notice, and libraries deserve stable copies; these editions fix the record as issued. Collect the doctrine shelf alongside the analytical flagship of the series, the RKHS-extended edition of Space Force Vector 2025.

This 60-page Nimble Ultra paperback identifies NASA Office of Inspector General as the originating body and preserves NASA's Management of the Human Landing System Contracts (IG-26-004) as a durable print reference. The edition is intended for policy research, technical study, teaching, professional consultation, and library collections.

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NASA's Management of the Human Landing System Contracts (IG-26-004)

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