(Reuters) – On a cloudless, windswept Georgia morning 100 miles (160 km)south of Atlanta, a rescuer dangled 30 feet (9 meters) in the air, secured by rappelling ropes, wielding a jackhammer, as he drove the drill into a massive concrete slab designed to mimic the 1985 bombing of the federal building in Oklahoma City. It took about an hour to punch a hole big enough to reach mock disaster “victims” trapped between the slab and an exterior wall.

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