The Pentagon is preparing US military bases to operate independently for at least 90 days during a major war, with plans for backup power, fuel and water supplies, weapons stockpiles and alternative supply chains to keep US forces operational if critical infrastructure fails.

The Pentagon is preparing US military bases to operate independently for at least 90 days during a major war, with plans for backup power, fuel and water supplies, weapons stockpiles and alternative supply chains to keep US forces operational if critical infrastructure fails.