Janus: The Army's Plan to Put Microreactors on Bases

The U.S. Army has moved forward with a major step in military energy resilience by awarding up to $2.2 billion in milestone-based agreements to five firms to deliver nuclear microreactors to domestic bases. Named the Janus Program, the effort pairs Antares, BWXT Advanced Technologies, General Atomics Electromagnetic Systems, Radiant Industries, and Westinghouse Government Services with Fort Bragg, Fort Campbell, Fort Hood, Fort Benning, and Fort Drum respectively. Prototype units will be contractor-owned and contractor-operated, and funding will be paid only after companies meet defined technical milestones across fiscal years 2027–2031.

Advanced tests have already been conducted; Antares completed a zero-power criticality test at Idaho National Laboratory on June 4, 2026, a milestone that underpins the program’s technical confidence. The Army intends to regulate these installation reactors through its Army Reactor Regulatory Office rather than the Nuclear Regulatory Commission, so designs will be reviewed under a military permitting framework even while the service seeks alignment with Energy Department safety practices. Although developers expect reactors to generate between one and twenty megawatts each, limited national production of high-assay low-enriched uranium (HALEU) is acknowledged as a supply constraint that could affect scheduling.

Leaders have set an operational target of September 30, 2028, for the first installation-operating reactor, and they describe Janus as a pathway to scale advanced reactors beyond military use. If the contractors and regulators meet the program’s milestones on schedule, the United States could see a rapid increase in factory-built, transportable nuclear power systems that are intended to bolster training, operations and base resilience in contested or remote environments.