This report identifies locations in the continental United States that are candidates for super-hardened air bases, with a focus on geological and topographical considerations. Requirements include a steep slope, with a minimum of 2,000 feet of relief in which to locate entrance and exit tunnels; at least 1,000 feet of rock above the main installation; an open flat area nearby for runways; an absence of strong earthquake activity; location within range of potential targets; and feasible operational conditions (e.g., logistics and climate).
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