Air Force Master Sgt. David Dalbec, clears a room during the Active Shooter Training Course in Mt. Pleasant, , Feb. 23, 2010. The AST course prepares first responders on how to react to a hostile situation. Sergeant Dalbec is an combat arms instructor with the 148th Fighter wing Duluth, Minn. James M. Bowman

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Keywords: .., active, air, base, carolina, charleston, defense, force, military, shooter, south, training, united, usa, war