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Police officer Edward 'Mac' McAllister out in front of Rayburn Horseshoe, off limits to all the vehicles, save for member's car. Day after car bomb explosion in Oklahoma City on April 19, 1995. (Photo by Maureen Keating/CQ Roll Call via Getty Images)

Police officer Edward 'Mac' McAllister out in front of Rayburn Horseshoe, off limits to all the vehicles, save for member's car. Day after car bomb explosion in Oklahoma City on April 19, 1995. (Photo by Maureen Keating/CQ Roll Call via Getty Images)

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