The US Department of Defense is preparing its military bases so that they can continue to operate without foreign support for at least 90 days. The move is intended to prepare for the possibility of a major war that could disrupt energy grids, disrupt supply chains and threaten critical infrastructure within the US. The US Department of Defense is preparing its military bases so that they can continue to operate for at least 90 days without external support. This step is preparation for the possibility of a major war that could disrupt energy grids, disrupt supply chains and threaten critical infrastructure within the United States. The US Department of Defense is preparing its military bases so that they can continue their work for at least 90 days without outside support. This step comes in preparation for the possibility of a major war that could disrupt energy grids, disrupt supply chains and threaten vital infrastructure on American soil.