Pentagon Mandates 90-Day Self-Sufficiency for U.S. Military Bases

The Department of Defense has established a requirement for major U.S. military installations to sustain essential operations independently for at least 90 days without outside support. This directive, part of the broader FORTRESS initiative, aims to ensure American forces can continue fighting even if civilian power grids, supply chains, and critical infrastructure are disrupted during a major conflict, according to documents reviewed by Fox News Digital.

Pentagon chief spokesperson Sean Parnell told Fox News Digital that relying on standard civilian municipal infrastructure to run national defense presents an intolerable risk. The initiative reflects a shift in homeland defense strategy, moving away from the assumption that geographic separation provides sufficient protection.

Under FORTRESS, every major military installation in the continental United States must maintain access to electricity, water, fuel, and communications for the specified period. Parnell emphasized that power is now a combat requirement, noting that without electricity, the military loses communications, water, logistics, assembly lines, and basic command structures. To achieve this independence, the Pentagon is exploring portable nuclear reactors, large-scale battery storage, and microgrids that can disconnect installations from the civilian electrical grid.

The strategy also addresses the vulnerability of global supply chains. Parnell warned that in a multi-front conflict, global supply chains will break, necessitating strategic reserves of munitions, fuel, critical minerals, electronics, spare parts, and medical supplies. These reserves are intended to sustain operations if international routes are disrupted or domestic manufacturers cannot meet wartime demand. For the most critical dependencies, FORTRESS requires at least two qualified supply or production pathways to prevent single points of failure.

To support these efforts, the Pentagon is integrating the Civil Reserve Manufacturing Network into FORTRESS. This component involves identifying commercial factories capable of shifting to defense production during a crisis. The department plans to assess manufacturers' capabilities and establish technical specifications, cybersecurity protections, and contracting arrangements in advance rather than waiting for a conflict to begin. Recurring industrial stress tests and mobilization exercises will determine whether these manufacturers can maintain production through prolonged disruptions.

Beyond energy and manufacturing, the initiative includes measures to strengthen military communications, navigation, and satellite capabilities against interference. This includes preparations to maintain operations when GPS signals are jammed or space-based assets are disrupted. Parnell described FORTRESS as an insurance policy for the homeland, designed to ensure American forces can operate even if a major war disrupts the infrastructure and supply chains they rely on.