Air Force Starts Construction on Sentinel Training Site
The service is building a 160,000-square-foot training facility at Vandenberg Space Force Base for the LGM-35A Sentinel program.
Updated on Oct. 24, 2026 in Military
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The United States Air Force began foundational work for the LGM-35A Sentinel program in August 2026. This effort includes constructing a new 160,000-square-foot training facility at Vandenberg Space Force Base in California.
Why it matters
The Department of War created Joint Task Force Castle to manage the complex infrastructure required for the Sentinel program. This new initiative is designed to modernize the nation's nuclear capabilities by replacing the aging Minuteman III intercontinental ballistic missile.
The new training facility at Vandenberg spans 160,000 square feet and will house virtual simulators for operators. Joint Task Force Castle currently consists of 18 personnel tasked with overseeing construction across the United States.
The players
United States Air Force
The branch of the U.S. Armed Forces responsible for aerial warfare and management of the nation's land-based nuclear deterrent.
Joint Task Force Castle
An inter-agency organization established by the Department of War to oversee the construction and infrastructure development for the Sentinel program.
William Hannan Jr.
The Brigadier General who currently serves as the commander of Joint Task Force Castle.
U.S. Army Corps of Engineers
A federal agency that provides engineering and construction management services for complex military and civil infrastructure projects.
The details
Joint Task Force Castle provides technical oversight, real estate management, and construction coordination for essential infrastructure like utility corridors and launch facilities. The team operates out of Hill Air Base and utilizes virtual simulators to ensure technicians are fully prepared to maintain the new weapon system.
Timeline
1960: The U.S. Army Corps of Engineers established the original Ballistic Missile Construction Office.
August 2026: The Air Force accelerated foundational work for the LGM-35A Sentinel program.
October 2026: Joint Task Force Castle held its official activation ceremony.
Political Context
This facility construction follows the strategic framework set by the LGM-35A Sentinel program to modernize the nuclear triad. Critics and some lawmakers have frequently challenged the program's massive budgetary requirements and timeline delays compared to the legacy Minuteman III system.
While the project is a major federal undertaking, it does not immediately alter daily civilian life or tax obligations. Residents near Vandenberg Space Force Base may notice increased activity, though the site is a continuation of existing military training operations.
The takeaway
The development at Vandenberg demonstrates the massive scale of modernizing nuclear defense systems. Readers should monitor future updates regarding the deployment of the Sentinel program as it reaches significant implementation milestones.
Further reading
Learn more about ongoing defense infrastructure projects in the Military section.
Source note: This article includes information reported by Eurasia Review.
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