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In a statement, the White House said Randolph "Tex" Alles "has done a great job at the agency" and would be replaced by James M. Murray, a career Secret Service member, who will start in May.
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The Secret Service made some immediate changes after the president's death 50 years ago this month: Open limousines were out. And it began taking a more aggressive approach to its advance work. Over the years, the service has established counter-sniper units, assault teams and surveillance units.