In this June 11, 2015, photo, Detroit Police Deputy Chief Renee Hall speaks before a group of "Detroit Ambassadors" during a swearing-in ceremony in Campus Martius Park in Detroit. Dallas has hired its first female police chief to lead a department that last summer saw several officers killed when a gunman opened fire during a protest. City officials announced Wednesday, July 19, 2017, that Hall will take over the Dallas Police Department on Sept. 5. ( John T. Greilick/Detroit News via AP)
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