War: What is STRENGTH? Inside the Pentagon's 90-Day War Plan as US Military Bases Prepare to Survive Without Outside Support

The Pentagon is preparing major US military installations to operate independently for at least 90 days without outside support as it ramps up preparations for a potential major war that could cripple energy grids, disrupt global supply chains and threaten critical infrastructure on US soil, a report said.

The request is part of FORTRESS, a broader military initiative to ensure U.S. forces can continue to operate even when the civilian infrastructure they depend on is disrupted, according to documents reviewed by Fox News Digital.

“We don’t want to rely on standard civilian utility infrastructure to run our national defense. We just can’t. It’s an intolerable risk,” the news outlet quoted Pentagon spokesman Sean Parnell as saying.

The initiative also seeks to prepare civilian factories to transition to defense production during a crisis, create alternative supply chains and build strategic stockpiles of essential materials, including weapons, fuel and critical components.

The Pentagon’s 90-Day Self-Sufficiency Plan

Under FORTRESS, every major military installation in the continental United States would be expected to maintain base operations independently for at least 90 days. This would include maintaining access to electricity, water, fuel and communications even when civilian infrastructure is unavailable.

The initiative reflects a shift in the Pentagon’s approach to homeland defense, with more emphasis on the possibility that a major conflict could disrupt infrastructure in the United States, rather than remaining confined to overseas battlefields.

“I realized that a lot of the way we think about homeland defense has been built on the outdated assumption that two oceans will protect us,” Parnell told Fox News Digital.

“President Trump understands that the world is gone, and he’s already paved the way for new thinking: the Golden Dome, a renewed focus on the Western Hemisphere, Greenland, Panama,” Parnell added.

‘Power is the fight now’: Pentagon plans backup energy systems

A key focus of FORTRESS is to reduce the military’s reliance on civilian power grids that support communications, logistics, weapons production and other essential defense operations.

“Power is a struggle now. Without electricity, you lose communications, water, logistics, assembly lines and just basic military command structures,” Parnell said.

According to news reports, FORTRESS envisions the use of portable nuclear reactors, large-capacity battery storage and microgrids that can disconnect military installations from civilian power grids during extended power outages.

Parnell described FORTRESS as an insurance policy for the American homeland, designed to ensure that U.S. forces can continue to operate even if a major war disrupts the infrastructure and supply chains on which they depend.

“You don’t want to make these decisions in the middle of a global conflict on many fronts. We have to have a plan,” Parnell said.

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Pentagon warns global supply chains could ‘break down’ during war.

FORTRESS also addresses the possibility that a major conflict could disrupt international supply routes used to obtain weapons, equipment and critical materiel.

“The next conflict is likely to be fought on multiple fronts. Look at the geopolitics behind every major war. When that happens, global supply chains will be disrupted,” Parnell told the media.

To mitigate these risks, the initiative calls for strategic stockpiles of ammunition, fuel, critical minerals, electronics, spare parts and medical supplies. These supplies would help sustain military operations if international supply routes were disrupted or domestic producers struggled to meet wartime demand.

The initiative also establishes a requirement for at least two qualified supply or production routes for the military’s most critical defense dependencies. The measure is intended to reduce the risk that the loss of a single factory, supplier or industrial capacity could disrupt military operations.

Civilian factories could switch to defense production

Another major component of FORTRESS is preparing the US commercial manufacturing sector to support the military during a crisis.

Through the Civil Reserve Manufacturing Network, an existing initiative incorporated into FORTRESS, the Pentagon plans to identify civilian factories that could transition to defense manufacturing during an emergency.

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