HILL AIR FORCE BASE, Utah — The U.S. government has completed what it described as the first air transport of a nuclear microreactor, flying Valar Atomics’ unfueled Ward 250 on U.S. Air Force C-17 aircraft to support testing tied to fast-deployable power for military and civilian uses, Feb. 16, 2026.
Officials from the Department of Energy and the Department of Defense joined the flight from California to Utah, framing the operation as a proof point for moving compact reactor hardware quickly to remote locations when conventional fuel supply chains are strained or contested. The Ward 250’s reactor module and components were flown without nuclear fuel, according to Reuters.
Why a nuclear microreactor matters for rapid power
Backers say a nuclear microreactor could provide steady electricity in places where diesel deliveries are costly, risky or unreliable. In this case, the Ward 250 is being pitched as a transportable system that can scale from early, low-power demonstration to higher output over time, with proponents arguing it could reduce logistics vulnerabilities for installations and expeditionary operations.
Under Secretary of Defense for Acquisition and Sustainment Michael Duffey, who was aboard the flight, said the milestone was about speed and access: “This gets us closer to deploy nuclear power when and where it is needed to give our nation’s warfighters the tools to win in battle,” he said, according to Reuters.
The Wall Street Journal reported the move required multiple aircraft and that the Valar Atomics Ward 250 was shipped unfueled, highlighting the defense-driven interest in compact nuclear systems that can be staged and assembled near the point of need. (See The Wall Street Journal’s reporting.)
What arrived at Hill Air Force Base
The Ward 250 is a nuclear microreactor concept from California-based Valar Atomics. The company describes Ward 250 as part of a push toward standardized, repeatable reactor builds and deployment models aimed at industrial and off-grid uses, including power-hungry facilities that need high reliability. (Company overview: Valar Atomics’ Ward 250 page.)
Defense observers also noted the sheer novelty of packing a reactor package into strategic airlift. The aviation logistics and the protective transport configuration drew attention in defense media coverage of the mission. (Background visuals and technical discussion: The War Zone.)
For proponents, moving a nuclear microreactor by air is part demonstration, part message: that next-generation reactors can be treated more like high-value equipment than like traditional, site-built megaprojects. For skeptics, it raises questions about cost, oversight and how quickly unproven designs can be pushed into operational settings.
Continuity: how microreactors got here
The Hill Air Force Base delivery did not happen in a vacuum. For years, the Pentagon and Energy Department have been building an ecosystem of programs meant to field transportable reactors and learn how to regulate, secure and operate them.
In 2024, the Energy Department said the Defense Department broke ground at Idaho National Laboratory on Project Pele, a transportable microreactor demonstration intended to generate power in the 1-to-5 megawatt range and to test the end-to-end concept. (DOE recap: Department of Defense breaks ground on Project Pele microreactor.)
Even earlier, the federal government documented environmental and safety planning for a prototype mobile microreactor under Project Pele in a 2022 Federal Register record of decision, underscoring that transportable reactor concepts have been under formal review for several years. (See Federal Register record of decision.)
By late 2025, Reuters reported the U.S. Army launched the Janus Program to pursue a reactor on a military base by 2028, explicitly building on lessons from earlier efforts like Project Pele and signaling a broader push for deployable nuclear power at installations. (Reuters context: U.S. Army microreactors set to boost wider nuclear industry.)
Industry coverage has also tracked Valar Atomics’ footprint in Utah, with the American Nuclear Society reporting in 2025 on state-linked announcements and the company’s plans around Ward 250 development and testing. (See ANS: Valar Atomics breaks ground in Utah.)
What comes next for the nuclear microreactor
Officials have said the Ward 250 hardware moved to Utah is part of a staged testing pathway, beginning with lower-power operations before ramping toward higher output goals. Supporters argue a nuclear microreactor can offer reliable, round-the-clock power with a smaller footprint than conventional reactors, while critics question whether microreactors can compete economically with grid upgrades, renewables paired with storage, or other distributed generation options.
For the Air Force and other services watching closely, the practical questions go beyond the flight: How quickly can a nuclear microreactor be assembled and made safe at a new site? What security and emergency planning requirements will apply? How will spent fuel and long-term waste be handled? And what does a credible cost-per-megawatt look like at scale?
Still, the airlift itself marks a clear inflection point. By treating a nuclear microreactor as cargo that can be loaded, flown and positioned for testing, the U.S. signaled it wants deployable nuclear energy to move from concept briefs to operational reality—one flight, one base and one reactor package at a time.
