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SAC created the Headquarters Emergency Relocation Team (HERT), based at the Cornhusker Army Ammunition Plant about 150 miles west of Omaha, a convoy of EMP-hardened command posts mounted on tractor-trailers that would have deployed out into the vast open American West during an attack. Later renamed the Enduring Battle Management Support Center and staffed by the 55th Mobile Command and Control Squadron, the unit’s patch hinted at its Doomsday task: A Grim Reaper sneaking through the night carrying a lightning bolt.
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Garrett M. Graff (Raven Rock: The Story of the U.S. Government's Secret Plan to Save Itself--While the Rest of Us Die)