What Sentinel’s new land proposal does—and does not—decide

Original AFA Connect reporting. Facts are attributed to the public records and reporting listed below. Report a factual error.

Sources and records

• Notice of Intent: Sentinel Deployment and Minuteman III Decommissioning and Disposal Supplemental Environmental Impact Statement — Department of the Air Force / Federal Register
• Sentinel SEIS proposed action (undated; accessed October 19, 2026) — Sentinel SEIS project website
• AFGSC hosts Sentinel Town Hall meetings — Defense Visual Information Distribution Service

Image: U.S. Air Force photo by Senior Airman Mary Bowers

The Air Force’s revised approach to replacing Minuteman III missiles puts a new question before communities around its missile fields: how would a different mix of newly built facilities, existing sites and additional land change the environmental effects of deploying Sentinel?

An October 9 Federal Register notice starts a supplemental environmental review of changes to the deployment plan. It does not itself approve the revised configuration. The distinction matters because the Air Force already made a deployment decision in May 2023; this proceeding addresses changes to that earlier approach, rather than starting the entire replacement program from scratch.

Archival image: Col. Daniel Voorhies addresses a Sentinel town hall in Lewistown, Montana, on Sept. 4, 2024. This photograph does not depict October 2026 scoping. U.S. Air Force photo by Senior Airman Mary Bowers, via DVIDS.

Why the earlier approach is being revisited

The notice attributes the change to cost and schedule risks associated with converting existing Minuteman III launch facilities into Sentinel launch-silo sites. It says those risks made key program milestones unachievable under the original infrastructure-recapitalization approach.

That is an explanation for evaluating a different approach, not evidence that the new approach has already solved those problems. The notice says the Air Force evaluated deployment strategies to reduce execution risk and stabilize costs. It does not provide a demonstrated cost saving or a completed construction schedule for the proposed configuration.

The proposed action includes conversion of qualifying existing launch facilities, construction of new launch-silo sites, changes to supporting facilities and additional utility easements. The project website also describes possible land acquisition and reuse of former missile-area locations. Those categories should not be treated as interchangeable: buying land, converting an existing facility and reusing a geographic location describe different parts of a deployment plan.

Why this report does not give a combined new-silo count

The public records do not clearly reconcile their site figures. The Federal Register notice refers to “up to 60 new LS sites at Malmstrom and Minot.” That wording does not specify whether the figure applies to each field separately or to the two together.

The project’s proposed-action page separately describes Malmstrom land acquisition and construction for up to 30 new launch-silo sites, and reuse of former 564th Missile Squadron geographic sites for up to 60 new launch-silo sites. It does not explain whether those figures overlap or are additive. Reuse of a geographic location also should not be confused with reuse of an existing silo structure.

The same proposed-action page lists other base-specific figures separately: at F.E. Warren, land acquisition and construction for up to 30 new launch-silo sites; at Minot, land acquisition west and east of the existing missile field for up to 60 new launch-silo sites. These descriptions provide context for the three fields, but they do not reconcile the Federal Register wording or establish how Malmstrom’s categories relate.

Until those relationships are clarified, adding the figures would introduce an assumption the cited records do not resolve. This report therefore does not offer a consolidated count or infer a force expansion from proposed site changes.

What comes next

The notice requests public comments on alternatives, impacts and relevant studies during a 30-day scoping period beginning with publication. It says comments will also be accepted throughout the supplemental review, while asking for submissions during scoping to allow sufficient time for consideration.

The Air Force anticipates a draft supplemental environmental impact statement in fall 2027 and a final statement in spring 2028. Those are anticipated environmental-review milestones, not missile deployment or construction-completion dates.

For readers evaluating the announcement, the key distinction is between a proposed physical layout, the environmental analysis of that layout and an approved decision. The October notice opens that analysis; it is not proof that every proposed site change will be built.

Read the October 9 Federal Register notice and the Sentinel SEIS proposed-action description. The appearance of U.S. Department of War (DoW) visual information does not imply or constitute DoW endorsement.