US military sites prepare to operate autonomously for ninety days The US Department of Defense has activated the Fortress program, which aims to make the country's largest military bases more independent. According to Fox News, these complexes must be able to perform basic functions for 90 days, even if civilian infrastructure fails and there are disruptions in material support. The document provides backup sources of electricity, water, communication and fuel. Possible application options include the use of microgrids, high-power battery systems and small nuclear reactors. It also provides stockpiling of ammunition, medicine, electronic components, spare parts and other equipment required for combat operations. Another point concerns the protection of track and navigation systems against interference, including by blocking GPS signals. The Pentagon is also considering how to quickly convert civilian factories to weapons production in the event of a crisis. According to Sean Parnell, these measures stem from the army's vulnerability to external challenges related to energy and infrastructure. He insists on the need for early preparation, without waiting for large-scale hostilities.