““roadway, got trapped under an overpass. FEMA created its own mobile command center effort, known as Mobile Emergency Response Support (MERS) units—eventually building some 300 special vehicles and stationing them across the country at regional command centers. The convoys, the thinking went, would be able to range across the nation, one step ahead of any Soviet attacks, hiding in the vast portions of the country that would be unscathed by nuclear attack. The convoys were meant to be entirely self-sufficient for a month, carrying massive generators and specially equipped fuel tankers that could draw diesel fuel from abandoned gas stations across the country. Meanwhile, a network of as many as 500 radio towers known as GWEN, the Ground Wave””