GRISSOM AIR RESERVE BASE, Ind. -- A mass notification system message notifying Grissom personnel about a simulated earthquake is seen displayed on an Airman's computer. Grissom personnel dropped, covered and held on during a Great Central U.S. ShakeOut earthquake drill along with millions of other Americans. (U.S. Air Force photo/Tech. Sgt. Mark R. W. Orders-Woempner)
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