War: What is FORTRESS? Inside Pentagon's 90-day war plan as US military bases prepare to survive without outside support

FORTRESS is a broader Pentagon initiative for keeping American military operations running during a major conflict. It addresses the risk that power grids, water systems, communications, factories and international supply routes could be disrupted. The goal is to reduce dependence on civilian infrastructure and fragile supply networks.

Under the plan, every major military installation in the continental United States would sustain essential operations independently for at least 90 days. Bases would need continued access to electricity, water, fuel and communications. FORTRESS also includes strategic reserves and backup production arrangements.

The initiative reflects a change in homeland-defense planning. Pentagon spokesperson Sean Parnell said relying on standard municipal infrastructure is an intolerable risk. FORTRESS would also prepare civilian factories to switch to defense production and require multiple supply or production pathways for critical military needs.

FORTRESS sets a 90-day independence requirement for every major military installation in the continental United States. That means a base should continue essential missions even if civilian systems can no longer provide support. The requirement is designed for a major conflict that could damage infrastructure inside the United States.

The bases would need to maintain electricity, water, fuel and communications. These services support command structures, logistics, weapons production, communications and basic daily operations. Losing one service could weaken the others, especially when a base depends on civilian networks.

The article presents the 90-day standard as a preparedness target, not evidence that every base already meets it. The Pentagon is developing measures such as microgrids, battery storage, portable nuclear reactors, fuel reserves and alternative supply routes to help installations reach that level of resilience.

Civilian infrastructure supports many military functions, so disruption could quickly affect operations. The article says losing electricity could mean losing communications, water, logistics, assembly lines and basic military command structures. A damaged civilian network could therefore affect both routine support and wartime decision-making.

Supply-route disruption creates a second danger. If international routes break or domestic factories cannot meet demand, the military could struggle to obtain weapons, fuel, critical minerals, electronics, spare parts and medical supplies. A single failed factory or supplier could also interrupt an important capability.

FORTRESS is intended to limit these consequences before a crisis begins. It calls for independent base services, strategic stockpiles and at least two qualified supply or production pathways for critical dependencies. These measures would help sustain operations when civilian systems or overseas routes are unavailable.

Pentagon planning is changing because officials say homeland threats can reach inside the United States. Sean Parnell described the old belief that two oceans would provide protection as an antiquated assumption. The new approach considers how a major war might disrupt power, communications, factories, transportation and other infrastructure on American soil.

This shift matters because military forces depend on civilian systems even when fighting overseas. Bases use civilian electricity, water networks, communications and supply chains. If those systems are disrupted, military operations could be weakened without an enemy directly attacking every installation.

FORTRESS reflects this broader homeland-defense focus. Parnell linked the new thinking with Golden Dome, renewed attention to the Western Hemisphere, Greenland and Panama. The initiative aims to prepare before a global, multi-front conflict rather than force leaders to make resilience decisions during one.

Microgrids, battery storage and portable nuclear reactors are described as ways to reduce a base’s dependence on the civilian electricity grid. Together, they could help an installation continue receiving power when the wider network is damaged or unavailable. Electricity matters because it supports communications, water, logistics, assembly lines and command structures.

A microgrid can manage electricity locally and disconnect the installation from the civilian network during a prolonged outage. Large batteries can store energy and provide power when normal supplies fail. Portable nuclear reactors are envisioned as another potential source of sustained electricity for military installations.

The article presents these systems as part of FORTRESS’s planning, not as a claim that they are already deployed everywhere. Their purpose is to support independent base operations for at least 90 days, alongside fuel, water and communications arrangements.

Strategic reserves reduce the immediate impact of disrupted supply routes or insufficient wartime production. FORTRESS calls for stockpiles of munitions, fuel, critical minerals, electronics, spare parts and medical supplies. These reserves could sustain military operations while replacement supplies or production capacity are arranged.

The initiative also requires at least two qualified supply or production pathways for the military’s most critical dependencies. In practice, that means a vital item should not rely on only one factory, supplier or industrial capability. If one pathway is lost, another can help maintain access.

Together, reserves and redundancy provide different forms of protection. Reserves address short-term shortages, while multiple pathways reduce the risk of a single failure causing a broader interruption. The article connects both measures to possible global supply-chain disruption during a major, multi-front conflict.

A supply chain is the linked system through which raw materials, components, fuel, equipment and finished goods are produced, moved and delivered. Military forces depend on many such links, including factories, suppliers, transport routes and international sources of critical materials. A failure at one point can affect later stages.

For example, a factory may need imported electronics, fuel or minerals before it can produce a defense item. If conflict disrupts shipping, energy supplies, a supplier or a production site, the factory may not receive what it needs. The shortage can then affect spare parts, weapons or other military equipment.

The article warns that a major, multi-front war could break global supply chains. That is why FORTRESS proposes strategic reserves, alternative supply chains and at least two qualified production pathways. These measures are meant to keep military operations supplied when one route or region is disrupted.